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Dan Holley

@danholley.bsky.social
553 followers 170 following 63 posts

Met Office Deputy Chief Meteorologist @metoffice.gov.uk ⛅ Weather Images Editor, RMetS journal "Weather" www.rmets.org/weather 📖 Research: tinyurl.com/wxresearch 📈 Storm Chaser 🌩🏃 Own views

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Dan Holley @danholley.bsky.social · 30/09/2026
It was an exceptionally warm night across the UK for late September, with some stations recording 22°C during the early hours. The temperature has been rising all through the night at Edinburgh, for example. Red box highlights just how much last night stands out from individual site records.
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Dan Holley @danholley.bsky.social · 13/08/2026
The Partial Solar Eclipse of 12th August 2026 over east Devon – maximum obscuration around 94% ☀️🌗🌍
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Dan Holley @danholley.bsky.social · 10/08/2026
Four minutes of totality featuring a 3°C drop in temperature, winds falling light and a glimpse of solar prominence and the Sun's corona... 🌑☀️ We shared the experience with a local farmer, Steve, who was more excited that a small group of Brits had turned up in his hamlet than the actual eclipse!
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Dan Holley @danholley.bsky.social · 10/08/2026
A short video, panning from SW to NE, of totality from the 8th April 2024 Total Solar Eclipse, taken at ~2pm local time in rural Illinois. Such a surreal experience, especially the shadow bands immediately before totality.
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Dan Holley @danholley.bsky.social · 04/08/2026
Experimenting with ways to convey extremeness of a month/season as a combination of temperature, rainfall and sunshine. Eventually settled on these "Climate Segments", which really highlight how exceptional July 2026 was in England/Wales. More details in the Deep Dive: youtube.com/watch?v=m-om...
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Dan Holley @danholley.bsky.social · 25/07/2026
On this day 5 years ago, thunderstorms caused significant flooding in parts of East Anglia, London and SE England. Brettenham (Suffolk) received ~180 mm of rain in less than 2 hours – one of the most intense short-duration rain events recorded in the UK. www.youtube.com/watch?v=PNP0...
youtube.com
The Brettenham storm of 25 July 2021
YouTube video by WeatherQuest Ltd
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Dan Holley @danholley.bsky.social · 03/07/2026
no, that was the forecast maximum air temperature
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Dan Holley @danholley.bsky.social · 02/07/2026
indeed, very low probability (unlikely this year) but we only really noticed 40°C in the ensembles in 2022 (it may have been there in the past, hidden away perhaps) and now we're seeing 45°C in ensemble data just 4 years later...
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Dan Holley @danholley.bsky.social · 02/07/2026
Today the @metoffice.gov.uk issued its forecast for 2056, featuring the possibility of temperatures reaching 45°C in the UK. By chance, member #24 of today's 12Z GEFS ensemble is predicting 45°C in almost exactly the same location on 13th July 2026 – 30 years too early? @aidanmcgivern.bsky.social
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Dan Holley @danholley.bsky.social · 29/06/2026
Here's a look at numerous individual weather stations across a swathe of England + Wales, comparing the maximum temperature recorded during June 2026 with the whole of summer 1976 – in some cases temperatures were over 4°C hotter in the recent heatwave 🌡️ bsky.app/profile/meto...
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Dan Holley @danholley.bsky.social · 27/06/2026
Hi Steve, that's correct - Pembrey Sands with 34.9°C on 25th
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Dan Holley @danholley.bsky.social · 27/06/2026
yeah, good spot - that seemed to be an erroneous observation from April
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Dan Holley @danholley.bsky.social · 27/06/2026
The exceptional June 2026 #heatwave: - 130 wx stations (13 with data spanning ≥100 years) set new June TMax records - 124 (10 spanning ≥100 years) set new June TMin records - 26 set all-time TMax records, largely focussed in coastal counties - 65 sites set all-time TMin records
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Dan Holley @danholley.bsky.social · 07/06/2026
just a quick photo from my phone on Friday evening - the structure was incredible! 😊
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Dan Holley @danholley.bsky.social · 06/06/2026
Near-stationary supercell thunderstorm over Swanton NE on Friday evening 🌩️
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Dan Holley @danholley.bsky.social · 01/06/2026
Thunderstorms in eastern Kansas on Sunday night were prolific lightning producers 🌩️
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Dan Holley @danholley.bsky.social · 01/06/2026
fantastic 😀 we had some Dutch chasers parked next to us for a time, perhaps the same?
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Dan Holley @danholley.bsky.social · 01/06/2026
A glimpse of the brief nocturnal #tornado from a supercell thunderstorm near #Madison KS, lit by CG lightning, around 21:40 CDT on Sunday evening 🌩️
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Dan Holley @danholley.bsky.social · 28/05/2026
if you click on the email icon next to my name it should give you the email address - I'm currently away storm chasing in the US at the moment, so will check my emails once I'm back in mid June 😊
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Dan Holley @danholley.bsky.social · 27/05/2026
New paper looking at very large hail (up to 5 cm in diameter) in E'ern Scotland in Aug 2025. A cell merger event, coupled with complex topography, may have been partly responsible for the enhanced hail size in an otherwise weak wind shear environment. rmets.onlinelibrary.wiley.com/doi/10.1002/...
rmets.onlinelibrary.wiley.com
Severe thunderstorms over eastern Scotland, 14 August 2025 – a case of very large hail in a synoptically weak vertical wind shear environment
Severe thunderstorms occurred over eastern Scotland on 14 August 2025, leading to impacts from flash flooding, lightning strikes and notable damage from hail up to 5cm in diameter. Hail of this size ....
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Dan Holley @danholley.bsky.social · 26/05/2026
It’s still considered a low-level site and representative of where people live etc
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Dan Holley @danholley.bsky.social · 26/05/2026
Once again, same process at play allowing observation stations situated on hills, above the temperature inversion, to record some impressively high minimum temperatures – including Pennerley (Shropshire) at 357m and Emley Moor (West Yorkshire) at 267m bsky.app/profile/meto...
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Dan Holley @danholley.bsky.social · 25/05/2026
Kenley was an ideal candidate to break the May daily minimum temperature record due to its elevation – at 170 m it sits above the temperature inversion, whilst many of its neighbouring sites below the inversion recorded lower temperatures overnight bsky.app/profile/meto...
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Dan Holley @danholley.bsky.social · 11/05/2026
Another pulse of unusually cold air for the time of year spreading south across the UK yesterday into today 🥶 00Z radiosonde ascent at Lerwick measured a 1000-850 hPa thickness of 128.6 dam (❌), sitting in the bottom 2% of the 31-day centred record. Already 6 air frosts at Kinbrace — May avg 4.6
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Reposted by Dan Holley
Met Office - weather and climate @metoffice.gov.uk · 31/03/2026
The Easter weekend is looking very unsettled, especially towards the northwest with a series of low pressure systems set to push through 🌧️ Find out more in our latest Deep Dive with Alex Burkill 👇
open.spotify.com
Deep Dive 31/03/2026 –Low after low – Met Office weekly weather forecast UK
Spotify video
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Dan Holley @danholley.bsky.social · 02/04/2026
#ArtemisII launch captured on mid-level water vapour imagery from the GOES-East satellite 🚀🛰️ Credit: College of DuPage
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Reposted by Dan Holley
Met Office - weather and climate @metoffice.gov.uk · 05/02/2026
Wondering where the sunshine has gone? Spare a thought for northeast Scotland; Aberdeen Dyce hasn't recorded any sunshine since 21 January! This is provisionally the longest sunless period here since records began in 1957 ☁️
A map of Scotland showing Aberdeen Dyce Airport with a cloudy weather symbol and a text box reading "Longest time with no sunshine on record"
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Dan Holley @danholley.bsky.social · 05/02/2026
Dyce (Aberdeen) has now recorded no sunshine for the past 14 days – its longest spell on record (since 1957) ☁️ The daily frequency (persistence) of SE'ly weather types in the objective Lamb Weather Types dataset (since 1871) was the joint 2nd highest on record for the month of January...
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Reposted by Dan Holley
MetJam @metjam.co.uk · 04/02/2026
Information is from Stephen Burt: Reading has seen 24 consecutive days of rainfall, the longest unbroken spell of consecutive rainfall days at Reading since daily rainfall records began in 1908, beating the 23 days set in December 1934 and in January 1970. It has been very wet.
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Dan Holley @danholley.bsky.social · 25/12/2025
Merry Christmas all, on the highest pressure over the UK on Christmas Day since 1991 📈 The Scottish mountains have been poking above the subsidence inversion, where Cairngorm recorded a dewpoint of -41°C yesterday afternoon, with a corresponding relative humidity of 2%! 🏔️
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Dan Holley @danholley.bsky.social · 08/10/2025
What does 4th December have in store I wonder 🤔
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Dan Holley @danholley.bsky.social · 22/09/2025
In the HadUKP series for the "NW England and north Wales" region, Saturday 20th September 2025 was the 7th wettest day in the whole dataset back to 1931. For a two-day event, Friday 19th/Saturday 20th falls to 12th place, but is the wettest two-day period since Christmas Day/Boxing Day 2015.
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Dan Holley @danholley.bsky.social · 21/09/2025
Across a swathe of Wales and N'ern England, Sat 20th Sept was the wettest climatological day (09Z - 09Z) since at least New Year's Eve 2024. Loftus (N Yorks) recorded its wettest day, for any month, since Aug 2002; Trawsgoed (Ceredigion) wettest day since Oct 2018. Data @roostweather.bsky.social
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Dan Holley @danholley.bsky.social · 14/08/2025
Very energetic thunderstorms in eastern Scotland this afternoon, producing hail ≥3 cm in diameter and torrential rain — some unofficial gauges recorded as much as 50 mm in 15-25 minutes. The temperature at Aboyne fell by 11°C over a 24 minute period ⛈️
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Dan Holley @danholley.bsky.social · 04/08/2025
looks to be the case Trev. Funny you mention the hurricane season, as the remnants of Tropical Storm Dexter may get pulled towards the UK by the weekend (but quite uncertain).
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Dan Holley @danholley.bsky.social · 04/08/2025
Storm #Floris, an exceptional summer storm 🌀 Provisionally: - Strongest August gust on record in Scotland - Equal strongest August gust on record in Northern Ireland - Lowest August mean sea level pressure in NW Scotland and Orkney since 1992 - Central pressure ⬇️ 28 hPa in 24 hours
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Reposted by Dan Holley
Simon Lee @simonleewx.com · 04/08/2025
06Z surface analysis from @metoffice.gov.uk showing Storm Floris at 983 hPa just west of Scotland. The frontal analysis follows the Shapiro-Keyser cyclone model, with a frontal fracture (cold front detached from the warm front). S-K cyclones are typically among the most intense & rare in summer.
Met Office 06Z surface pressure and fronts, Mon 4 Aug 2025.
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Reposted by Dan Holley
Dan Harris @roostweather.bsky.social · 20/07/2025
A beaut of an MCV (Mesoscale Convective Vortex) - h/t @danholley.bsky.social
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Dan Holley @danholley.bsky.social · 30/06/2025
Decent noctilucent cloud display from Devon (50.7°N) late Sunday evening ✨
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Dan Holley @danholley.bsky.social · 27/06/2025
pretty good for UK standards 😁
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Dan Holley @danholley.bsky.social · 27/06/2025
thanks Richard - unfortunately I was still in the U.S. when that event occurred, but I haven't come across any significant reports other than a few instances of flooding and lightning strikes. I was told that there was rotation evident in velocity data though
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Dan Holley @danholley.bsky.social · 26/06/2025
yes, fingers crossed! 🤞
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Dan Holley @danholley.bsky.social · 25/06/2025
Popped in to the @metoffice.gov.uk Deep Dive studio yesterday to chat about supercell thunderstorms 🌩️ youtu.be/AR6Egr5UzOc
youtu.be
Deep Dive 24/06/2025 – Was there a supercell at the weekend? – Met Office weekly weather forecast UK
YouTube video by Met Office - UK Weather
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Dan Holley @danholley.bsky.social · 17/06/2025
and now I've just seen Nebraska 🤯🫨
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Dan Holley @danholley.bsky.social · 16/06/2025
My turn tomorrow, 5:20am alarm set 🤯 missing the Plains already… 🥺
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Dan Holley @danholley.bsky.social · 08/06/2025
fingers crossed for a decent event later this week! 😊🤞
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Dan Holley @danholley.bsky.social · 08/06/2025
Lightning under moonlight, west of Channing TX on Saturday evening ⚡🌚
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Dan Holley @danholley.bsky.social · 08/06/2025
Incredible supercell structure near Amistad NM on Saturday evening 🌩️
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Dan Holley @danholley.bsky.social · 07/06/2025
An hour earlier, the same supercell thunderstorm moved through Gruver TX, with the tornado sirens blaring across town as Emergency Alerts ring on our mobile phones
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