Heatwave in Iceland (almost +27°C), but frosts 0/-5°C in Europe, storm in the Mediterranean, heatwaves in continental Europe are shifting to 1.6.-15.7. 2025
Marek Kučera 
While Europe is in May 2025 again suffering severe cold, after extremely late destabilization of polar vortex in winter season 2024-2025, in early April 2025 /https://mkweather.com/the-polar-jet-steam-and-current-effects-on-european-weather-in-may-of-2025/; https://mkweather.com/the-collapse-of-the-polar-vortex-in-2025-and-late-season-cold-in-europe//, Iceland is happy from extremely hot weather with temperatures almost +27°C.
While lower situated regions in Poland, Slovakia or Czechia, around 1000 MASL, in the last days reported snowing and late-May snowfall is possible in the UK, too (Scotland), in Egilsstaðaflugvöllur, Iceland, on Thursday, 15. May 2025, an extremely high temperature of +26,6°C was measured, which is a new national Icelandic record of maximum temperature for May.
In mountainous station Gagnheiði in Iceland, at 950 MASL, +20,3°C was on 16. May 2025 measured and a previous monthly recordm +12,9°C was broken by 7,4°C! In Stykkishólmur, a monthly record, +20,3°C was measured (the hottest May day since 1885).
Meanwhile, in a Mediterranean was causing floods a Mediterranean low (and not only in Europe, but in Algeria and Tunisia, with fatalities, too), including floods in Valleta, Malta, Spain and Italy; and in continental Europe severe late-Spring frosts 0/-5°C were continuing, with damaging crops and harvest.
On 12. May 2025, the following Tmins were observed: Alytus, Lithuania, -2,7°C, Vasilevici, Belarus, -2,6°C, Lebork, Poland, -2,4°C, Pec pod Snezkou, Czechia, -1,9°C, Bialystok, Poland, -1,8°C, Kuusiku, Estonia, -1,7°C, Zwettl, Austria, -1,6°C, Stende, Latvia, -1,4°C, Hoyerswerda, Germany, -1,0°C, Doksany, Czechia, -0,8°C, Lodz, Poland, -0,7°C, Ivano-Frankivsk, Ukraine, -0,6°C, Gomel, Belarus, -0,4°C, Liberec, Czechia, -0,4°C, Narva, Estonia, -0,4°C, Presov, Slovakia, -0,1°C.
On 13. May 2025, the next Tmins were measured: Resko, Poland, -2,4°C, Barth, Germany, -2,2°C, Narva, Estonia, -2,2°C, Rucava, Latvia, -2,2°C, Zwettl, Austria, -2,0°C, Varena, Lithuania, -1,6°C, Pec pod Snežkou, Czechia, -1,5°C, Torun, Poland, -1,2°C, Kamenica nad Cirochou, Slovakia, -0,6°C, Miercurea Ciuc, Romania, -0,6°C, Vrsac, Serbia, -0,6°C, Liberec and Ostrava, Czechia, -0,2°C, Lviv, Ukraine, -0,1°C.
On 14. May 2025, extremely cold air shifted southward: Sjenica, Serbia, -2,5°C, Zwettl, Austria, -1,5°C, Lyntupy and Minsk, Belarus, -0,8°C, Varena, Lithuania, -0,8°C, Miercurea Ciuc, Romania, -0,7°C, Telgart, Slovakia, -0,7°C, Suwalki, Poland, -0,6°C, Plevlja, Montenegro, -0,5°C,
On 15. May, these temperatures were measured: Altnaharra, the UK, -2,9°C, Kuusiku, Estonia, -1,6°C, Niksic, Montenegro, -1,2°C, Eskisehir, Turkey, -1,0°C, La Brevine, Switzerland, -0,9°C, Lebork, Poland, -0,8°C, Sjenica, Serbia, -0,8°C, Shap, the UK, -0,7°C, Utena, Lithuania, -0,7°C, Telgart, Slovakia, -0,6°C, Messstetten, Germany, -0,2°C, Usak Meydan, Turkey, -0,2°C, Cervena, Czechia, -0,1°C, Presov, Slovakia, -0,1°C.
On 16. May was peaking the next coldwave: Tegart, Slovakia, -3,2°C, Altnaharra, the UK, -2,8°C, Shap, the UK, -2,3°C, Utena, Lithuania, -2,1°C, Vilnius, Lithuania, -1,8°C, Poprad, Slovakia, -1,5°C, Lviv, Ukraine, -1,2°C, Szecseny, Hungary, -1,2°C, Oberstdorf, Germany, -1,0°C, Lyntupy, Belarus, -0,8°C, Lesko, Poland, -0,7°C, Presov, Slovakia, -0,7°C, Josvafo, Hungary, -0,6°C, Warth, Austria, -0,6°C, Elseborn, Belgium, -0,5°C, Munich, Germany, -0,3°C, Dudince, Slovakia, -0,2°C, Usti nad Orlici, Czechia, -0,2°C, Uzhorod, Ukraine, -0,2°C, Minsk, Belarus, -0,1°C.
Finally, on 17. May 2025, were these Tmins measured: Altnaharra, the UK, -3,9°C, Kielce, Poland, -0,7°C, Shap, the UK, -0,2°C, Valke Maarja, Estonia, -0,2°C, Weitensfeld, Austria, -0,1°C.
According to the long-term outlook, colder weather will stay in Europe almost until the end of May 2025, with the next cold peaks, but June and the first half of July 2025 should be gradually from the West hot, with tropical, in continental Europe temporarily supertropical days (above +30 / +35°C). In Spain, already in May, +40°C and in Turkey, +45°C should be measured.
Anomalously late easterly winds of polar vortex at 60°N before mid-Spring 2025. Source: https://www.climate.gov/news-features/blogs/polar-vortex/early-interesting-end-2024-25-polar-vortex-season
HEATWAVE IN ICELAND (ALMOST +27°C)
SNOW IN POLAND, SLOVAKIA, CZECHIA
A POSSIBLE END-MAY SNOWSTORM IN THE UK
Temperature anomalies in Europe on 18., 23., 31. May and 1. June 2025. Source: https://www.wxcharts.com/?panel=default&model=gfs,gfs,gfs,gfs®ion=europe&chart=2mtemp_anom,850temp,wind10mkph,snowdepth&run=12&step=360&plottype=10&lat=51.500&lon=-0.250&skewtstep=0
Accumulated precipitation in Europe until 2. June 2025. Source: https://www.wxcharts.com/?panel=default&model=gfs,gfs,gfs,gfs®ion=europe&chart=accprecip,850temp,wind10mkph,snowdepth&run=12&step=384&plottype=10&lat=51.500&lon=-0.250&skewtstep=0
An arrival of heatwaves in Europe between 2.-30. June 2025. Source: https://charts.ecmwf.int/products/extended-anomaly-2t?base_time=202505160000&projection=opencharts_europe&valid_time=202506300000
The hottest and the coldest days in regions in Europe in the next 16 days. Source: https://www.wetterzentrale.de/en/topkarten.php?map=3&model=gfs&var=17&time=6&run=12&lid=OP&h=0&mv=0&tr=6
Source: https://eswd.eu/cgi-bin/eswd.cgi
List of heavy precipitation this week. Source: https://ogimet.com/ranking.phtml
Floods in Valetta, Malta. Source: https://timesofmalta.com/article/flight-london-malta-diverted-sicily-due-thunderstorm.1109745
Floods in Mazara del Vallo, Italy. Source: https://stormreport.meteonetwork.it/asset/photo/28348_1747320255.4738.jpg
Damaging lightening in Trutnov, Czechia. Source: https://x.com/RongeLukas/status/1923420068773294489
Floods in Mistretta and Reitano, Sicily, Italy (51 – 52 mm). Source: https://stormreport.meteonetwork.it/asset/photo/28390_1747385268.5597.jpg, https://www.facebook.com/photo/?fbid=702391918937542&set=pcb.702397195603681
Waterspout in Skiathos, Greece. Source: https://www.facebook.com/photo/?fbid=10162977676612008&set=a.147034712007
Floods in Milano, Italy. Source: https://www.facebook.com/photo/?fbid=10237478951782294&set=a.1372421599678
Pressure low above the Mediterranean this week.
Waterspout near Adana, Turkey
Tornado in Chornobay, Ukraine. Source: https://t.me/truexacherkasi/26452
Floods in Araya, Spain.
Floods in Sicily, Italy.
Severe floods in Kadirli, Turkey.
Hailstorm in France.
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