Richard Allan
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rpallanuk.bsky.social
Richard Allan
@rpallanuk.bsky.social
1.9K followers 990 following 170 posts
Professor of climate science at the University of Reading: http://www.met.reading.ac.uk/~sgs02rpa/
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rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 7th Nov 25:
🌀 Tropical Cyclones affect Caribbean and South East Asia
🌧️ Landslides & floods hit Uganda/Kenya
⛈️ Storms strike Brazil
⚪ Giant Hail in northeast Australia
🏔️ Avalanches in Italy & Nepal
www.met.reading.ac.uk/~sgs02rpa/ex...
© WFP/Arete Communities in Jamaica are clearing up after the devastation caused by Hurricane Melissa.
November 7, 2025 at 4:38 PM
rpallanuk.bsky.social
New @royalsociety.org report assesses geoengineering #climate to mask human caused warming by artificially injecting aerosol haze to reflect sunlight, arguing it can only be used as a well coordinated compliment to deficient mitigation of greenhouse gas emissions:
royalsociety.org/news-resourc...
Schematic of solar radiation modification techniques
November 6, 2025 at 6:49 AM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 31 Oct 2025:
🌀 Hurricane MELISSA hits Caribbean
🌀 Cyclone MONTHA affects India
⛈️ storms across USA
🌧️ #floods over Colombia, Indonesia, Vietnam, Spain, South Sudan
🏔️landslides in Uganda & Papua New Guinea
www.met.reading.ac.uk/~sgs02rpa/ex...
A building stands amid torn tree branches in an affected area, after Hurricane Melissa made landfall in Black River, Jamaica, on October 30, 2025 [Octavio Jones/REUTERS]
October 31, 2025 at 3:53 PM
rpallanuk.bsky.social
Keeping the planet below the 2°C Paris #climate limit will ensure almost all Antarctic ice shelves remain, while most will eventually melt as after warming passes 4.5°C with the potential for 10 metres of sea level rise - based on @nature.com study:
doi.org/10.1038/s415...
Figure 3 of Burgard et al. showing how Antarctic ice shelves become unviable for warming above 4.7 degrees Celsius Fig. 4 of Brugard et al. shwoing ice shelves at risk in low and high emissions scenarios
October 30, 2025 at 12:34 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social:
🌀 tropical cyclone MELISSA in Caribbean
💨 storm Amy France/UK
⛈️ storms Brazil, Colombia, New Zealand, Philippines
🏭 smog N India
🌫️ freezing fog Finland
🌧️ #floods Indonesia, Mexico
🥀 #heatwave & #drought Mali & Zambia
www.met.reading.ac.uk/~sgs02rpa/ex...
climate extremes contribute to food insecurity in Zambia [IPC ACUTE FOOD INSECURITY ANALYSIS APRIL 2025 – MARCH 2026 Published on 17 October 2025
October 24, 2025 at 3:03 PM
rpallanuk.bsky.social
Latest @ukceh.bsky.social UK hydrological summary for September 2025 - some respite from dry conditions with high river flow in northwest but low in parts of the east and depleted groundwater across many regions:
nrfa.ceh.ac.uk/sites/defaul...
Map showing above average rainfall in September 2025 over many western and central parts of UK in contrast to last 6 months High river flows in many western parts of UK in September 2025 but low in the east
October 17, 2025 at 2:29 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 17 Oct 2025:
🌀 tropical storm JERRY affects Guadeloupe, Martinique
🌧️ #floods across DR Congo, South Sudan, Tunisia, Nigeria, Guatemala, Venezuela, Mexico, USA
⛈️ storms hit Malaysia
www.met.reading.ac.uk/~sgs02rpa/ex...
A local walks along a mud-covered street in Poza Rica, Veracruz state, Mexico, on Tuesday, Oct. 14, 2025, after landslides and torrential rain. (AP Photo/Felix Marquez)
October 17, 2025 at 2:10 PM
rpallanuk.bsky.social
Latest global extremes:
🌀Tropical cyclone MATMO Philippines, China, Vietnam
🌀 Typhoon Halong near Japan
🌧️flooding Nepal/N India/Pakistan, Thailand, Georgia, Bulgaria, Chad
⛈️storms hit Bangladesh, Northern Europe
❄️avalanche Slovenia
www.met.reading.ac.uk/~sgs02rpa/ex...
October 10, 2025 at 3:58 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 3rd Oct 2025:
🌀 tropical cyclones IMELDA/HUMBERTO affect USA/Bermuda + BUALOI hits Laos, Philippines, Thailand, Vietnam
🌧️ #floods in Algeria, Cambodia, Haiti, Italy, Spain, Nigeria, Ukrain
www.met.reading.ac.uk/~sgs02rpa/ex...
NASA satellite images showing strengthening storm Imelda and Hurricane Humberto over Atlantic
October 3, 2025 at 3:32 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 26 Sep 2025:
🌀 tropical cyclones RAGASA & BUALOI hit south-east Asia
🌧️ #flooding & landslides affect France, Haiti, India, Indonesia, Italy, Nigeria, Pakistan, Spain, Taiwan, Thailand, USA
🔥 #wildfire in Portugal
www.met.reading.ac.uk/~sgs02rpa/ex...
BBC reporter braving RAGASA winds with spray from massive wave shown [source: BBC]
September 26, 2025 at 5:11 PM
rpallanuk.bsky.social
Higher CO2 levels have been increasing tree size in the Amazon, potentially increasing carbon uptake but this may be short lived as larger trees can be more susceptible to climate change intensified heat & drought:
www.nature.com/articles/s41...
Map with blue up arrows showing where trees are becoming larger over Amazon
September 26, 2025 at 7:34 AM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 21 Sep 2025:
🌀 Tropical cyclones MITAG & RAGAS affect Philippines, China
💨 storm not-Amy hit UK & France
🌧️ #floods across Gambia, India, Malaysia, Niger, Pakistan, Philippines, South Sudan, USA, Vietnam, Yemen
www.met.reading.ac.uk/~sgs02rpa/ex...
© UNHCR/Tiksa Negeri People displaced by flooding carry children and belongings along a waterlogged road in Bentui, South Sudan.
September 21, 2025 at 3:53 PM
rpallanuk.bsky.social
Dry, warm conditions persisted over UK in August 2025 with low river flows, groundwater, reservoir levels & soil moisture leading to #drought impacts; wetter September is alleviating surface water deficit but more sustained rainfall needed to replenish deeper supplies:
nrfa.ceh.ac.uk/sites/defaul...
Map showing below average August 2025 rainfall over UK Map showing low river flows over UK in August 2025 Map showing low groundwater levels over much of the UK in August 2025 Map showing dry soils over parts of UK in August 2025
September 15, 2025 at 10:35 AM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 12th September 2025:
🌧️ #flooding & landslides affect Gambia, India, Indonesia, Pakistan & Thailand
🌪️ storms hit Japan
🍞 food insecurity for Guatemala, Madagascar, Mozambique, Gaza
🔥 #wildfire in USA
www.met.reading.ac.uk/~sgs02rpa/ex...
People packed onto small boats floating in brown flood waters. The background shows submerged houses and trees. [Getty Images of Pakistan flooding via BBC]
September 12, 2025 at 3:31 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 8th Sept 2025:
🌀 tropical cyclone TAPAH China, Philippines;
🌧️ #floods & landslides Vietnam, north India, Pakistan, Yemen, South Sudan, Sudan, Nigeria, Mauritania, Sierra Leone, USA;
🌩️storms Italy, Japan
🔥 #wildfire USA
www.met.reading.ac.uk/~sgs02rpa/ex...
People gather after a landslide destroyed Tarseen village in South Darfur, Sudan [© Jebel Marra/Emergency Response Room via UN News].
September 8, 2025 at 4:27 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 15th Aug 2025:
🔥 #heatwave & #wildfires grip southern Europe
🌧️ #floods & landslides affect Pakistan, India, China, Japan, Mexico, Cape Verde, Cameroon, Nigeria
🌀 tropical cyclone PODUL hits Taiwan/China
www.met.reading.ac.uk/~sgs02rpa/ex...
Firefighters work to extinguish a wildfire approaching Trancoso, Portugal. REUTERS/Pedro Nunes
August 15, 2025 at 3:38 PM
rpallanuk.bsky.social
Rainfall below average in southwest UK July 2025 with mostly dry soils, declining groundwater/reservoir stocks & low river flows away from northwest + drought affecting East/West Midlands, North-West England & Yorkshire with low river flows expected to persist:
nrfa.ceh.ac.uk/sites/defaul...
map showing dry soils in south west & central south UK, midlands and Yorkshire in July 2025 map showing low groundwater in many parts of UK in July 2025 map showing very low river flows in the UK during July 2025 apart from over the northwest map showing below average rainfall in southwest of UK in July 2025
August 14, 2025 at 1:42 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social:
🌡️ heatwave multiple regions
🔥 wildfires Canada, USA, France, Portugal
🌧️ floods/landslides Australia, China, Taiwan, India,Laos,Myanmar,Vietnam,S Korea,Japan,USA
⛈️storms Ethiopia, Italy
💨duststorm Peru
🥀drought Somalia
www.met.reading.ac.uk/~sgs02rpa/ex...
People load their car and prepare to evacuate their house near a growing wildfire in Squamish, British Columbia, Canada, on June 9, 2025 [Jesse Winter/Reuters]
August 8, 2025 at 3:54 PM
rpallanuk.bsky.social
This builds on earlier studies identifying continental drying. Although contribution to sea level from terrestrial water storage decline ramps up (their Fig 4A) this may be dominated by melting of ice since contribution from liquid water is stable since 2015 (Rodell Fig1): doi.org/10.1007/s107...
Figure 4 of Chandanpurkar showing increasing sea level rise from terrestrial water storage decline Figure 1 of Rodell et al showing abrupt drop of non frozen terrestrial water storage in 2015 and stable or rising since
July 30, 2025 at 11:19 AM
rpallanuk.bsky.social
Carbon uptake diminished in 2024 as decomposition in hot, wet conditions sped up, based on a preprint by Jiang et al. (www.researchsquare.com/article/rs-6...), leading to record annual growth rates in atmospheric CO2 as seen in the @climate.noaa.gov data: www.met.reading.ac.uk/~sgs02rpa/co...
CO2 levels and annuakl increases from the NOAA Mauna Loa observatory
July 28, 2025 at 8:08 AM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 25th July 2025:
🌧️ #floods across Pakistan, China, South Korea
🔥 #wildfires in Greece, Cyprus, Turkey
🥀 #drought over Iran
⛈️ storms hit Ethiopia, France, Romania, Thailand, Vietnam
🌀 typhoon Co-may hits Philippines
www.met.reading.ac.uk/~sgs02rpa/ex...
Residents try to extinguish the blazes in Omodos village, Cyprus, during a massive wildfire on the southern side of the east Mediterranean island nation’s Troodos mountain range, Thursday, July 24, 2025. (AP Photo/Petros Karadjias)
July 25, 2025 at 3:35 PM
rpallanuk.bsky.social
Global #climate hazards @ukhsa.bsky.social 18 Jul 2025:
🔥 #wildfires Canada, USA, Spain
🌧️ #floods & landslides China, Nepal, India, Indonesia, South Korea, Mexico, USA, Ecuador, Spain, Sudan
🌪️ tornado New Zealand
⚡ lightning eastern USA
www.met.reading.ac.uk/~sgs02rpa/ex...
Smoke from the wildfires blanketed the Toronto skyline on Monday, where the air quality was among the lowest in the world [Getty Images]
July 18, 2025 at 3:20 PM
rpallanuk.bsky.social
Clean up of particle pollution across East Asia caused more sunlight to reach the oceans as clouds became less reflective, combining with rising greenhouse gases to accelerate in warming of climate since around 2010:
doi.org/10.1038/s432...
Figure 3 of Samset et al evidence of warming from pollution decline
July 15, 2025 at 7:14 AM
rpallanuk.bsky.social
Unsettled start to June 2025 in UK then heatwaves with dry conditions in east & low river flows, very dry soils, declining groundwater/reservoir levels with drought in northern England and heightened risk of drought elsewhere: nrfa.ceh.ac.uk/sites/defaul...
Rainfall in June 2025, wet in west, dry in east of UK River flows in June 2025 low in east, higher in west of UK Variable groundwater levels across UK in June 2025 Dry soils over much of UK in June 2025 but wetter in Wales and north west UK
July 14, 2025 at 12:10 PM
rpallanuk.bsky.social
Risk of drought ending with once in a year heavy precipitation event doubles over Europe by mid centrury based on regional modelling, highlighting need to adapt to more of these compound extremes: doi.org/10.1038/s416...
Fig. 4 of Steenman et al (2025) shoing increase in compound drought then heavy rain compound events over Europe
July 14, 2025 at 11:03 AM