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Dan Holley

@danholley.bsky.social

490 followers 160 following 36 posts

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

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Dan Holley @danholley.bsky.social · 7d

What does 4th December have in store I wonder 🤔

Dan Holley @danholley.bsky.social · 23d

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.

Dan Holley @danholley.bsky.social · 24d

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 · Aug 14

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 · Aug 4

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).

Dan Holley @danholley.bsky.social · Aug 4

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 · Aug 4

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 · Jul 20

A beaut of an MCV (Mesoscale Convective Vortex) - h/t @danholley.bsky.social

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Dan Holley @danholley.bsky.social · Jun 29

Decent noctilucent cloud display from Devon (50.7°N) late Sunday evening ✨

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Dan Holley @danholley.bsky.social · Jun 27

pretty good for UK standards 😁

Dan Holley @danholley.bsky.social · Jun 27

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

Dan Holley @danholley.bsky.social · Jun 26

yes, fingers crossed! 🤞

Dan Holley @danholley.bsky.social · Jun 25

Popped in to the @metoffice.gov.uk Deep Dive studio yesterday to chat about supercell thunderstorms 🌩️ youtu.be/AR6Egr5UzOc

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

youtu.be

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Dan Holley @danholley.bsky.social · Jun 17

and now I've just seen Nebraska 🤯🫨

Dan Holley @danholley.bsky.social · Jun 16

My turn tomorrow, 5:20am alarm set 🤯 missing the Plains already… 🥺

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Dan Holley @danholley.bsky.social · Jun 8

fingers crossed for a decent event later this week! 😊🤞

Dan Holley @danholley.bsky.social · Jun 8

Lightning under moonlight, west of Channing TX on Saturday evening ⚡🌚

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Dan Holley @danholley.bsky.social · Jun 8

Incredible supercell structure near Amistad NM on Saturday evening 🌩️

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Dan Holley @danholley.bsky.social · Jun 7

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

Dan Holley @danholley.bsky.social · Jun 7

Lightning over Spearman TX on Friday evening, shortly after a tornadic supercell thunderstorm moved through town

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Dan Holley @danholley.bsky.social · Jun 6

Genuinely lost count how many tornadoes were produced by this supercell thunderstorm that trundled ESE'wards from near Dora NM to Lubbock TX on Thursday afternoon/evening 🌪️

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Dan Holley @danholley.bsky.social · Apr 10

I cobbled this graphic together back in 2022, so it hasn't been updated with recent years and may not necessarily reflect UK-wide trends... but it is interesting to see spring rainfall trending more "extreme" in East Anglia — either wet or dry, but more often on the dry side
x.com/danholley_/s...

x.com

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Dan Holley @danholley.bsky.social · Apr 1

many counties were in the top 5 for TMax, but as you mention the cold nights certainly brought the average down, especially across southern UK

Dan Holley @danholley.bsky.social · Apr 1

March 2025 was noteworthy for abundant sunshine and lack of rain — provisionally, it was the sunniest March on record in England, sunnier than July or August last year or the year before! ☀️

Wales (provisionally) had its driest March since 1944 & lowest number of March rain days (1 mm) since 1929. 🏜️

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Dan Holley @danholley.bsky.social · Mar 29

Despite the pesky cloud at times, a decent nibble and cheeky sunspot visible from Devon during this morning's Partial Solar #Eclipse 🌞🌚

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