Dan Harris @RoostWeather Twitter profile

Last Seen Profiles

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Dan Harris

@RoostWeather

3 years

#Larry from @Windycom

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Dan Harris

@RoostWeather

2 years

GFS 06Z run producing 42-43ºC as a maximum #temperature for the 17th July... here's some points of interest from a meteorological, and climatological point of view...

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Dan Harris

@RoostWeather

10 months

Comparison of #StormCiaran vs the 1987 "Great Storm". Similar central pressure, but Oct 87 moved faster, had slightly stronger winds, and a more northerly track, bringing them across SE UK. Most similar for NW #France and #Jersey (85-95kn at 5000' in Ciaran, vs 100 kn in 1987).

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Dan Harris

@RoostWeather

10 months

Some extreme low pressure solutions showing up next Thurs, eg 28/12Z MO GM at 949hPa at 06Z This would challenge November #UK records, 948.4hPa at #Aldergrove on 06Z 30/11/1954 the lowest currently in the MIDAS dataset Other notable lows - 949.3 (11/11/10), 950.4 (13/11/91)

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Dan Harris

@RoostWeather

1 year

Must be a Sunday #NightShift - time to draw the charts...

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Dan Harris

@RoostWeather

2 years

I've built a page which allows you to look back at previous runs, to help more easily identify model trends. Check it out here - An explanation of how it works is available on the left of the page. Thanks to @wxcharts for allowing me to use their images.

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Dan Harris

@RoostWeather

2 years

A special #Christmas chart/card for all my followers... a non traditional frontal analysis but a festive one nonetheless. It's been great to have been part of the community and to share weather facts and stats with you all over this past year. Have a great Christmas everyone!

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Dan Harris

@RoostWeather

11 months

Probably post night shift tiredness talking, and to no-one in particular, but: The Met Office don't issue medium or high impact warnings lightly. If we go RED, it comes from the culmination of intense analysis/discussion between experts in the field Take them seriously, please.

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Dan Harris

@RoostWeather

3 years

This is an absolutely stunning visualisation of the shockwave crossing the UK, thanks so much @imthursty . @burgwx

Will Thurston

@imthursty

3 years

Shockwave from Hunga Tonga-Hunga Haʻapai eruption plume, seen by pressure change at UK sites. Wave moves southward down the country 18-20Z 15Jan. The same wave, but travelling the other way around the globe, moves northward up the country 01-03Z 16Jan. @RoostWeather @Silkstiniho

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Dan Harris

@RoostWeather

1 year

With a reading of 983.0hPa on the 1300Z ob, @RNASYeovilton has recorded its lowest August mean sea level pressure since its record began in 1965. Previous lowest was 983.8hPa at 0700Z on Aug 30 1992. 983.9hPa the low at the Roost!

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Dan Harris

@RoostWeather

11 months

Wow it's even better now, a wonderful example of Shapiro-Keyser cyclogenesis - #StormAgnes There must be a sting-jet occurring, with prominent striations at the tip of the cloud head. I have a vague idea they might be called "Scorer's fingers" - though I can't find a source.

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Dan Harris

@RoostWeather

2 years

Fantastic hole punch #cloud forming almost directly overhead right now @metoffice #loveukweather

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Dan Harris

@RoostWeather

3 years

92 mph gust at #Stornoway Airport in the past hour as the winds swing abruptly around to the NNW. Unofficial reports from #Benbecula of gusts in excess of 100mph. #StormCorrie and thanks to @IslesWeather

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Dan Harris

@RoostWeather

1 year

It appears a large number of stations (and there will be more than shown here) have now broken their September max #temperature record in this hot spell... including #Larkhill where the POR goes back to 1921. @extremetemps

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Dan Harris

@RoostWeather

8 months

81mph at #Exeter Airport No2 a record for the site which opened in the early 1990s, and the 3rd strongest at Exeter Airport overall (including the original ob site). Only 83mph on 28/02/1990 and 85mph on 25/01/1990 (Burns Day Storm) were stronger. #StormHenk

Dan Harris

@RoostWeather

8 months

#StormHenk Strongest #wind gusts (>=30mph) so far today (2nd Jan) from the 03xxx SYNOP sites (<250m altitude). #Exeter Airport No 2 currently top of the pile with a #gust of 81 mph at 1250Z

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Dan Harris

@RoostWeather

3 years

108 mb #pressure difference across the Atlantic between High and Low on the 06Z Met Office Analysis - don't see that very often!

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Dan Harris

@RoostWeather

3 years

So, #rainfall at #Honister Pass in #Cumbria still going - now up to almost 340mm since the start of the #warm conveyor event yesterday morning. 298.8mm in a 24 hour period, which is right at the very top of observed #climate , even for this very wet site.

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Dan Harris

@RoostWeather

11 months

On the night of the 15th and early hours of the 16th October 1987, the "Great Storm" devastated the south of #England , with gusts in excess of 100mph recorded in the far southeast Here are the highest gusts at each official site (all occurring on the 16th), gusts >=50mph plotted

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Dan Harris

@RoostWeather

10 months

Massively hacked together and very last minute, but here's a map of #November minimum sea level #pressure (from MIDAS) for as many counties as I could match between datasets. Some records will fall over the next 24 hours! #StormCiar án Explore it here -

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Dan Harris

@RoostWeather

2 years

Exceptionally deep low (933 mb) over the far North Atlantic signalled in the latest forecast chart from the @metoffice - valid midday Fri 4th. This the result of the extratropical transition of Hurricane Martin, in a similar manner to Fiona which struck Canada earlier this year.

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Dan Harris

@RoostWeather

1 year

At least 69 sites have now broken their #September maximum #temperature record. Today, @RAFBrizeNorton reached 30.2ºC, which is the warmest September day since their records began in 1968. @extremetemps

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Dan Harris

@RoostWeather

10 months

#Rainfall at #Wattisham in #Suffolk off the scale... up to 196.4mm for the month so far now (not including today), trashing the old #October record of 138.7mm dating back to 1960. #StormBabet @danholley_

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Dan Harris

@RoostWeather

10 months

Didn't even occur to check until @danholley_ mentioned it, it's actually the wettest month on record for any month, beating November 1970 (156.2mm). And we are only 2/3 through!

Dan Harris

@RoostWeather

10 months

#Rainfall at #Wattisham in #Suffolk off the scale... up to 196.4mm for the month so far now (not including today), trashing the old #October record of 138.7mm dating back to 1960. #StormBabet @danholley_

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Dan Harris

@RoostWeather

1 year

Convection over #Denmark this afternoon produced a fantastic outflow boundary, visible as an undular bore rippling through the low cloud sheet over German Bight in the eastern North Sea. Imagery courtesy of @eumetsat

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Dan Harris

@RoostWeather

11 months

#StormAgnes undergoing explosive cyclogenesis now - looks just like an ocean wave breaking. Beautiful.

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Dan Harris

@RoostWeather

2 years

Never thought I'd see a 40 on the #UK map this side of 2030... wowee

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Dan Harris

@RoostWeather

2 years

In summary, it seems like achieving these temperatures is realistic in terms of the modelling, but requires conditions so far outside the recent climate that it seems hard to believe. However, our warming climate means that we probably underestimate the chance of it happening.

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Dan Harris

@RoostWeather

3 years

With #StormEunice having departed, comparisons have been made with the Great Storm of October 1987, and the Burns Day Storm of January 1990. Here are the top #gusts in mph for each event, gusts >=60 mph shown. Clearly #Eunice was a notch or two down on these.

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Dan Harris

@RoostWeather

2 years

I've built a page which you can use to find out the daily extreme maximum #temperature for any date in the year, using the NCIC OpenMIDAS database + SYNOPs to fill in the gaps. Read the notes at the bottom of the page! @markpmcc

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Dan Harris

@RoostWeather

3 years

That's what you call a #warm conveyor! @ECMWF multi-parameter EFI product.

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Dan Harris

@RoostWeather

1 year

Show of hands: who had trailing stratiform MCS in their convective forecast today...

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Dan Harris

@RoostWeather

2 years

With the #UK #weather focus (rightly) being on the now 50/50 chance of touching an unprecedented 40ºC maximum #temperature on Tuesday 19th July, here's a couple of other potential records to watch out for from a meteorological interest point of view...🧵

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Dan Harris

@RoostWeather

1 year

With a stonking 156.8mm of rain so far this #July2023 , #Blackpool has already had its wettest July on record, with still 1 week to go... Currently at 340% of normal for the first 23 days of July. #Rainfall records here go back to 1957.

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Dan Harris

@RoostWeather

2 years

Check out my latest page - see how many days each year the #temperature in the #UK exceeded a threshold of your choosing (between 20ºC and 40ºC). Click on the table below the graphs to see the details of individual days. Read the notes!

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Dan Harris

@RoostWeather

2 years

#Autumn2022 really out on a limb in this plot of #temperature vs #rainfall covering the years 1884-2022 Not long to go, looks like it will be easily the warmest Autumn on record in the #UK , and with the wet Nov, close to average in terms of rainfall despite the dry Sep and Oct.

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Dan Harris

@RoostWeather

8 months

It looks like #December2023 is going to be one of the dullest Decembers across the #UK in 108 odd years... ...but spare a thought for the residents of Bala in NW #Wales , who have seen just 3.8 hours of #sunshine so far this month, likely the dullest in over 50 years.

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Dan Harris

@RoostWeather

5 months

Happy Easter to all my followers!

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Dan Harris

@RoostWeather

11 months

Rainfall over the past 2 days and 3 hours, from official #rain gauges. Totals >=100mm plotted only. Some quite incredible, and widespread large totals across #Scotland , almost 180mm at Hazelwood Cottage, 105.0mm of which fell in just 12 hours, 137.8mm in 24. Significant impacts

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Dan Harris

@RoostWeather

10 months

With help from @danholley_ here's a gust map (mph) for #Ireland and #NorthernIreland , with some private sites (italic) alongside official obs. The strongest gusts in #StormDebi bisected the official obs almost perfectly, and appear to be assw the most intense cold conveyor flow.

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Dan Harris

@RoostWeather

2 years

Just for interest, here's what the maximum #temperature summary looked like for the 28th June 1976, which is when the #June record maximum of 35.6ºC at Southampton, Mayflower Park was recorded.

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Dan Harris

@RoostWeather

3 years

The #Tonga volcano shockwave was easily measurable and arrived at the Roost just before 1900! Just amazing to see. @eddy_weather @gmrpetricca

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Dan Harris

@RoostWeather

10 months

With thanks to @danholley_ (and @SnowbieWx , @northyorkswx for additional contributions), here's a (more-or-less) final map of highest #gusts from #StormDebi (>=50mph). Purple circles are private sites, purple squares are road sites, and green squares are additional official obs.

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Dan Harris

@RoostWeather

1 year

The signal for large hail over southern #England today has been strengthening in @essl_ecss product over the past 24 hours... below is the 12/00Z run, panels valid 12-15 and 15-18 UTC (BST-1 hour). Refer to @metoffice services for the official line!

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Dan Harris

@RoostWeather

10 months

Some dramatic pressure falls being observed in the southwest now as #StormCiaran approaches... ...a fall of 14.3mb in 3 hours on the 21Z #Camborne ob, and currently falling 12.7mb in 3 hours at my own station. Just dropped below 970mb too.

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Dan Harris

@RoostWeather

1 year

The 64.8mm recorded at #Exeter Airport in the period 16/21Z to 17/21Z was the 2nd wettest such 24 hour period on record, and the wettest day in over 50 years. Only the 90.3mm on 19/07/1972 was higher.

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Dan Harris

@RoostWeather

8 months

#StormHenk blowing through here at the Roost

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Dan Harris

@RoostWeather

2 years

Forecasters take note: with the actual Tmax peaking at 32.7C yesterday, this method verified extremely well!

Dan Harris

@RoostWeather

2 years

Using this revolutionary new ensemble technique, I would go for a peak max of 33ºC later this week, but it seems that anything between 29ºC and 36ºC remains possible.

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Dan Harris

@RoostWeather

1 year

Radar estimated accumulations over the past 18 hours (10pm yest to 4pm today), in the #thunderstorms and heavy #rain Areas of 60-80mm, and the odd pocket of 80mm+

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Dan Harris

@RoostWeather

2 years

A nice example of a diffluent block (also known as a Rex block) setting up later this weekend over Western #Europe - seen from the perspective of my T+120 chart. 10 days after the MJO entered Phase 7 as well!

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Dan Harris

@RoostWeather

2 years

Using this revolutionary new ensemble technique, I would go for a peak max of 33ºC later this week, but it seems that anything between 29ºC and 36ºC remains possible.

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Dan Harris

@RoostWeather

1 year

As the heat spread quickly NW last Saturday, mountain site Bealach Na Ba in W #Scotland recorded an all-time record maximum #temperature of 22.9ºC, beating its previous high of 22.7ºC set in July 2006. Observations back to July 2001.

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Dan Harris

@RoostWeather

2 years

8 am #Temperature difference compared with: Same time yesterday. Same time on 25th July 2019 (when the current UK max temperature record was set).

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Dan Harris

@RoostWeather

2 years

At least 23 official sites have also (provisionally) broken or equalled their November maximum #temperature record! Some of these records going back 90-100 years.

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Dan Harris

@RoostWeather

11 months

#Rainfall totals >=50mm over the past 48 hours #StormBabet 171.6mm at Waterside Perth in east #Scotland the largest amount, 169mm of this in 24 hours. Another up to 100mm possible here over the coming 24-36 hours, with a new @metoffice RED warning issued.

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Dan Harris

@RoostWeather

3 years

Following the #rain over the past couple of days, #Honister in #Cumbria is up to 815.4mm of rain for #October2021

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Dan Harris

@RoostWeather

2 years

In the UK daily precipitation series, which goes back to 1931, SE Eng (and Cen Eng, not shown), has had its driest first 13 days of Feb on record, with just 0.74mm total #rain recorded. Other dry years include 1934, 1959, 1964, and 1993. Eng & Wal overall currently 3rd driest.

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Dan Harris

@RoostWeather

6 months

Today I launched a major upgrade to my observations, getting rid of several maps and combining them into one universal display. There's an in-page version - and a full screen version - All connected to my seamless obs database!

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Dan Harris

@RoostWeather

7 months

I've added a page which allows the user to look at the state of the stratospheric temperature and winds (as analysed by GFS) over the past 30-days, in map form. Plots are kindly taken from @zd1awrence great site.

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Dan Harris

@RoostWeather

1 year

For the first time since the major #SSW on Feb 16th, the tropospheric NAM index has turned negative (as per the definition from NOAA Climate Prediction Centre). In very broad terms, a negative NAM represents weaker than average westerly winds at mid-latitudes. #weather #climate

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Dan Harris

@RoostWeather

2 years

Quality controlled #UK maximum #temperatures from the @metoffice OpenMIDAS dataset are now available on my maximum temperature summary map... data back to 1853! Let me know what you think, and especially if you find any bugs!

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Dan Harris

@RoostWeather

2 years

This is what you call explosive cyclogenesis! 😍 993mb -> 945mb, drop of 48mb in 24hr as per the official @metoffice analyses. Twice the rate of deepening required for a "bomb" (at 60ºN). Also check out the orographic cirrus in lee of Pennines at the end! Video h/t @eumetsat

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Dan Harris

@RoostWeather

2 years

Expanding the series of extreme #temperature maps, I've now got daily, monthly, and yearly extreme minima from official sites available. Check them out, let me know what you think/if you have any problems!

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Dan Harris

@RoostWeather

12 days

Numerous #wildfires across #Canada in combination with a very zonal (straight) jet stream across the Atlantic is causing a significant amount of #smoke to be drawn across the #UK currently. Also pulled south into the circulation of #Ernesto Imagery from @NASA Worldview

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Dan Harris

@RoostWeather

1 year

Breaking news... Monthly *maximum* CET for June 2023 has come in at 22.6ºC, toppling the previous warmest June (by this measure) which was 22.5ºC in *1976* Possibly this is more notable than the mean temperatures, as the max temperatures are what most people experience...?

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Dan Harris

@RoostWeather

4 months

6 hours of integrated #radar from 3pm to 9pm, with a core of highest totals centred just east of #Bradford city centre. #Flooding was reported, with this suggesting a peak accumulation of 67mm during this period.

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Dan Harris

@RoostWeather

2 years

(1/3) Some more maps for the weekend... In addition to my daily extreme max map, I've now added monthly and all-time max #temperature records for the ~1550 sites in Open MIDAS, supplemented by SYNOPs where available...

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Dan Harris

@RoostWeather

3 years

Met Office warnings, 0005Z Fri 18th Feb. Watch out for further reds - if issued this will indicate increased confidence of high impacts. BUT - if in the Amber warning area TAKE NOTE, conditions could be EQUALLY as severe, we are just not quite as confident yet. #StormEunice

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Dan Harris

@RoostWeather

2 years

Just looking back at the cold spell earlier in the month, and marvelling at the switch back to milder than average (1981-2010) conditions which swept rapidly NE across the UK between the 18th and 19th.

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Dan Harris

@RoostWeather

3 years

Merry Christmas to all my followers, hope you have a wonderful day, whatever you're doing. My Christmas thought: try not to get too worked up over individual model runs and even model trends, uncertainty is inherent in meteorology; you can't change the weather! Dan @ the Roost.

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Dan Harris

@RoostWeather

1 year

Incredible pic of a mature cumulonimbus

simon

@sienlel

1 year

@UKWeatherChase @StormHour @electricsky_uk @metoffice Pretty sure this is it from the air. Flew into Heathrow about 5pm yesterday. It was massive!

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Dan Harris

@RoostWeather

2 years

With a final mean of 11.15ºC, the annual mean Central England #Temperature on Dec 31st 2022 was the warmest on record, exceeding 2014 by 0.17ºC

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Dan Harris

@RoostWeather

3 months

At 9.0ºC, the mean minimum #UK #temperature was a full 2.7degC above the 1991-2020 climate average. This was the primary driver for month overall being the warmest May in the 141 year record.

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Dan Harris

@RoostWeather

2 years

@SusanPolgar Qxa7+ Nxa7, Nb6+ Kb8, Nxd7+ forking K and Q I'm getting better at these! (Unless this is very wrong :D)

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Dan Harris

@RoostWeather

2 years

A number of sites reporting >100mm of #rain in the first 4.5 days of #October2022 - and look at the west/east split! Allt Dearg House on Skye on 211.0mm, East Anglian sites (until this afternoon) less than 1mm.

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Dan Harris

@RoostWeather

11 months

Beautiful skies here in #Devon this afternoon/early evening, and quite a contrast to the northen half of the UK!

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Dan Harris

@RoostWeather

2 years

The daily minimum Central #England #Temperature for #December 9th was -5.1ºC, which was the second coldest Dec 9th in the daily min record which goes back to 1878. Only 1967 was colder 🥶

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Dan Harris

@RoostWeather

3 years

A comparison of #StormEunice , St Jude's Day Storm, Burns Day Storm, and the Great Storm of 1987, using monthly station gust climatologies ( #UK only, sorry #Ireland ). Max gust in 99th percentile or greater plotted only.

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Dan Harris

@RoostWeather

3 years

What a beaut. 938mb on the Met Office 18Z analysis chart, #pressure below 940mb is relatively rare for mid-latitude systems over the North #Atlantic .

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Dan Harris

@RoostWeather

1 year

2023 joins an exclusive club of years where the #UK monthly Tmax for both Jun & Sep was higher than both Jul & Aug The last time this occurred was 1940, and has only occurred 6 other times since the mid 1850's 1865, 1889, 1891, 1895, 1939, and 1940. Data: MIDAS @extremetemps

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Dan Harris

@RoostWeather

11 months

24 hours of #rainfall from my guesstimated #radar , 06/21Z - 07/21Z. White = 50-75mm, Grey 75-100mm, Black 100-125mm, Yellow 125mm+ The very large area of 75mm+ is likely to have been responsible for such extensive #flooding that has been reported.

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Dan Harris

@RoostWeather

2 years

Saw some great #sunset pictures from last night, and here in mid-Devon we had a particularly spectacular sunset too. Here's my favourite from the set. #loveukweather @metoffice

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Dan Harris

@RoostWeather

2 years

Percentage of average #rainfall for the first 12 days of #February , that has fallen this month. Extremely dry across much of the #UK so far, except the far N of #Scotland which has actually been wetter than average.

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Dan Harris

@RoostWeather

10 months

Channel Islands currently experiencing the most intense winds in the cold conveyor of #StormCiaran - the centre of which can be seen near #Southampton A less strong (but still strong) swathe slowly moving E across #Cornwall , moving across #Devon soon but winds slowly reducing.

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Dan Harris

@RoostWeather

1 year

Absolute stunner of a visible satellite picture courtesy of @NASA of a #thunderstorm propagating offshore of the Somali coast on May 5 Check out the "updraftlets" all ready and waiting to be hoovered up by the main cloud! Not seen anything like that before. Wave action?

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Dan Harris

@RoostWeather

1 year

This is a beaut!

Rob Mayeda

@RobMayeda

1 year

Quite the timelapse from the Rincon cam at @HAS_UArizona …wait for it. #AZwx 7/17/2023

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Dan Harris

@RoostWeather

1 year

At least 50 official sites recorded their lowest 5th August max #temperature , and more notably, 4 sites in Midlands and East Anglia, with records as far back as 1991, recorded their lowest #August daily max temp for any date.

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Dan Harris

@RoostWeather

2 years

Incredibly sharp edge to the extensive and widespread cirrus currently over #France and the Low Countries, which hasn't moved very much in the past few hours! It's feasible that #SaharanDust has increased the cloud ice content within this system relative to "normal"

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Dan Harris

@RoostWeather

1 year

#thunderstorms developed and ran N over the past few hours; a train of particularly nasty ones affecting #Dartmouth , #Totnes , and up towards E #Dartmoor . Private gauges report 60-75mm of rain, supporting #radar estimates of 64-80+mm. Another nasty swathe heading for #Sidmouth .

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Dan Harris

@RoostWeather

2 years

1000 followers! A big hello to you all from mid-Devon, and thanks for the support. I'm a @metoffice meteorologist with a lifelong love of #weather . My main interests are mid-latitude #dynamics , #UK #climate , and sharing a love of #meteorology !

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Dan Harris

@RoostWeather

3 months

#Spring2024 stats from NCIC are out, and here are the #climate headlines for the #UK as a whole!

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Dan Harris

@RoostWeather

1 year

Some really cool constructive and destructive interference patterns in these waves being reflected off the #sea wall, mesmerising to watch! #SummerHolidays

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Dan Harris

@RoostWeather

2 years

#February2023 is the first #February on record to feature in both the upper quintile for #temperature (ie mild), and lower quintile for #precipitation (ie dry) - in a series going back to 1884 Quintiles based on 1991-2020 #climate

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Dan Harris

@RoostWeather

7 months

#StormIngunn is a rather complex cyclone, arising from multiple "baroclinic streams" This coloured WV #satellite image may evidence two simultaneous, separate sting jets, the bright yellow features emanating from the tips of the two cloud hooks - one just west of the #Faeroes

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Dan Harris

@RoostWeather

2 years

A new visualisation - Central #England #Temperature daily anomalies. Plenty to customise, check it out and let me know what you think. Here's the last 10 or so years of #December Link from my #CET tracker -

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Dan Harris

@RoostWeather

3 years

Lightning strikes over the past 24 hours... red are the most recent, through the purple... you can really see the how the different elements of the system evolved through this period.

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Dan Harris

@RoostWeather

2 years

Just looking through yesterday's #weather data here at the Roost, and noticed some remarkable #pressure fluctuations... ...a drop of 4mb in 10 minutes at around 1630Z, did anyone else notice similar?

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Dan Harris

@RoostWeather

2 years

Still a week to go of course, but my crude estimates from SYNOPs highlighting, if things continue as is, the potential for this #July to be one of the hottest, and driest, on record here in the #UK overall.

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Dan Harris

@RoostWeather

3 years

This great IR image from @eumetsat taken just a couple of hours ago reveals the wave nature of the planetary scale flow in the mid-latitude atmosphere.

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Dan Harris

@RoostWeather

1 year

Last 6 hours of guesstimated integrated radar accumulations. 93.6mm over Central #Scotland the highest amount, may or may not be hail contaminated. Some of the peak totals are for sure.

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Dan Harris

@RoostWeather

2 months

Very pleased with how this has turned out... custom built live data display for my site, powered by Davis VP2, Meteobridge PRO2 and my own dodgy coding skills! Taught myself some javascript along the way too. #wxtwitter #CodingJourney

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