Main Topic: Where CAT3 #HeatwaveBluestone Will Set Records via @washingtonpost.com st On The Extreme Temperature Diary WED 7/01/2026 At: guyonclimate.com + #climate #weather + record temp reports @katharinehayhoe.com @michaelemann.bsky.social @cclsvn.bsky.social @bhensonweather.bsky.social

On 7/1 major CAT 3 #HeatwaveBluestone was peaking in the Midwest and building in the Northeast. It may become a historic CAT4 should many all-time records be set. My criteria: guyonclimate.com/2026/05/11/e @michaelemann.bsky.social @weatherprof.bsky.social @bhensonweather.bsky.social @zacklabe.com

On 7/1 major CAT 3 #HeatwaveBluestone was peaking in the Midwest and building in the Northeast. It may become a historic CAT4 should many all-time records be set. My criteria: guyonclimate.com/2026/05/11/e @michaelemann.bsky.social @weatherprof.bsky.social @bhensonweather.bsky.social @zacklabe.com

Main Topic: Where CAT3 #HeatwaveBluestone Will Set Records via @washingtonpost.com st On The Extreme Temperature Diary WED 7/01/2026 At: guyonclimate.com + #climate #weather + record temp reports @katharinehayhoe.com @michaelemann.bsky.social @cclsvn.bsky.social @bhensonweather.bsky.social

🔥 Ring of Fire Heat Dome will punch above its weight with near all-time records! The position of this heat dome / “ring of fire” (real term) will allow winds from the west on the north side of the dome to “downslope”/ flow downhills from the Appalachians & other mountains… 1/

Main Topic: CAT5 #HeatwaveEmber Causes Political Fallout in #Germany via @dwnewstoday.bsky.social On The Extreme Temperature Diary TUE 6/30/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social

Main Topic: CAT5 #HeatwaveEmber Causes Political Fallout in #Germany via @dwnewstoday.bsky.social On The Extreme Temperature Diary TUE 6/30/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social

Paris funeral homes overwhelmed after record heatwave

New study: the European heat wave would rank as the 7th deadliest in world history, using numbers from EM-DAT for historical events, as I detailed yesterday: yaleclimateconnections.org/2026/06/east... Callahan’s study is only for the 7 days ending Jun 28, and extreme heat also occurred Jun 29-30.

🥵 450 record hot temperatures in jeopardy through Sunday! 150 record highs up to 107°! 300 record warm mornings with some lows staying above 80° in the big cities of the East. Going to be a brutal stretch!! #heatwave #4thofJuly #heat

An unprecedented heatwave for June has set all-time heat records at 9 European nations or territories, and we expect a renewed resurgence early next week. For the rest of this week, it's the United States' turn to roast in a mega heat wave. @bhensonweather.bsky.social and I have the details:

Main Topic: U.S. #HeatwaveBluestone Gets Very Strong This Week via @washingtonpost.com On The Extreme Temperature Diary MON 6/29/2026 At: guyonclimate.com + #climate and record temp reports @michaelemann.bsky.social @katharinehayhoe.com @bhensonweather.bsky.social @weatherprof.bsky.social

150 Million people will endure extreme heat this week - that’s almost 1/2 of the US population! Can’t say I remember extreme heat this large! Feels like temps up to 115 in the purple with heat + humidity in one of the most expansive heatwaves to hit the Eastern half of US in many years. #heatwave

Europe, the last few days: 🇫🇷 France: Hottest day ever — 43.8°C 🇪🇸 Spain: Hottest June day — 42.7°C 🇩🇪 Germany: Hottest day ever — 41.5°C 🇨🇿 Czechia: Hottest day ever — 40.9°C 🇨🇭 Switzerland: Hottest June day — 38.8°C 🇩🇰 Denmark: Hottest day ever — 37°C 🇬🇧 UK: Hottest June day — 36.7°C #climatecrisis

Enjoy the coming relatively cool week in Western Europe while it lasts! Forecast for 8 July 🥵.

On 6/28 CAT3 #HeatwaveBluestone expanded in the Midwest and South and will spread into the Northeast this week. Severe wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherprof.bsky.social @zacklabe.com

Main Topic: Update on Catastrophic European Heatwave Ember via @apnews.com On The Extreme Temperature Diary SUN 6/28/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social @weatherprof.bsky.social

On 6/28 CAT3 #HeatwaveBluestone expanded in the Midwest and South and will spread into the Northeast this week. Severe wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherprof.bsky.social @zacklabe.com

Main Topic: Update on Catastrophic European Heatwave Ember via @apnews.com On The Extreme Temperature Diary SUN 6/28/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social @weatherprof.bsky.social

As @extremetemps.bsky.social has documented, all time-record high temps in northwest Siberia past couple of days. Beliy Island (73.3ºN) hit 28.3C (83F), apparently the highest temp so far north anywhere in the world. But this heatwave is distinct from the European heatwave. #Arctic #ExtremeWeather

Already a terrible fire weekend in the US Southwest. Three firefighters killed + two seriously injured in far W CO on Sat (Snyder-Mesa Fire). The Cottonwood Fire (E Utah) is approaching 100K acres + 0% contained. Pockets of thick smoke reached the Denver/Boulder area on Sat night.

‼️ Hottest Ever? It’s possible! The situation is escalating on the Eastern Seaboard/ I-95 corridor for late week. NOAA is forecasting peak highs close to the hottest ever measured. All-time highs from NYC to Baltimore/DC to Raleigh etc… are in the 103-107 range and in many cases the forecast is close

On 6/27 the CAT2 heatwave became a major CAT 3 with the name of Bluestone since Midwestern warnings went up. Severe wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherprof.bsky.social @zacklabe.com

On 6/26 the southern heatwave remained a CAT2 and should become a major CAT 3 with the name of Bluestone by Sunda. Wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherprof.bsky.social @zacklabe.com

Main Topic: Advent of U.S. #HeatwaveBluestone via @usatoday.com On The Extreme Temperature Diary SAT 6/27/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @weatherprof.bsky.social @bhensonweather.bsky.social @zacklabe.com

Main Topic: Advent of U.S. #HeatwaveBluestone via @usatoday.com On The Extreme Temperature Diary SAT 6/27/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @weatherprof.bsky.social @bhensonweather.bsky.social @zacklabe.com

ALL TIME RECORDS IN UK (Stations with 40+ years of data) Wattisham 36.9 Maddle Wallop 36.5 Otterbourne 36.4 Hurn 36.1 Boscombe Down 36.0 Cardiff 35.9 Shoeburyness 35.7 Chivenor 35.1 Thorney Island 34.9 Aberporth 34.7

The State & City of #Berlin may reach an average area temperature near 106° Sunday. Other cities nearby could spike to 108/109°. Not only would these break the #Germany  all-time record (again - prob 3 days in a row) it would also be a ~4 sigma event making it virtually impossible… 1/

Main Topic: France’s Heat This Week Was Worse Than a Dire Scenario Imagined For 2050 via @washingtonpost.com On The Extreme Temperature Diary FRI 6/26/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social

On 6/26 the southern heatwave remained a CAT2 and should become a major CAT 3 with the name of Bluestone by Sunda. Wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherprof.bsky.social @zacklabe.com

On 6/25 the Southwestern heatwave remains a CAT2 and should become a major CAT 3 with the name of Bluestone the next couple of days. Wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherwest.bsky.social

Main Topic: France’s Heat This Week Was Worse Than a Dire Scenario Imagined For 2050 via @washingtonpost.com On The Extreme Temperature Diary FRI 6/26/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social

Next week the Eastern US will endure a large and dangerous #heatwave. NOAA forecasting 53 Million people to be impacted by extreme heat on Wednesday alone, with heat index values up to 115° in purple! The heatwave will last the entire week from Monday into the following weekend!

A big and brutal heatwave will smother the Eastern US next week! Highs 95-100. Heat index 100-115. What really makes the #heatwave standout… the size and longevity… covering half the nation and lasting a full week for many. With all this said, the heat dome intensity will not be unprecedented.

It’s official. This is #Europe’s most severe #heatwave on record, as per a study by World Weather Attribution. It was found to be “virtually impossible” just 50 years ago, and made 3.5°C/ 6.3°F hotter than it would’ve been in 1976. Link to study in thread…

On 6/25 the Southwestern heatwave remains a CAT2 and should become a major CAT 3 with the name of Bluestone the next couple of days. Wildfires have broken out in many western areas. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherwest.bsky.social

Main Topic: European #HeatwaveEmber Dire Notes via @theguardian.com On The Extreme Temperature Diary THU 6/25/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social @bhensonweather.bsky.social @zacklabe.com

Main Topic: European #HeatwaveEmber Dire Notes via @theguardian.com On The Extreme Temperature Diary THU 6/25/2026 At: guyonclimate.com + #climate #weather + record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social @bhensonweather.bsky.social @zacklabe.com

It's probably time European journalists wrapped their heads around Heat Index (temp + relative humidity). In high humidity, sweating is less efficient, making heat worse, e.g.: Experiencing 35°C in London UK (70% RH) is more dangerous than 50°C in Phoenix Arizona (15% RH)

I spoke with Geeta GuruMurthy of BBC World News Television about the record European heat wave and it's link to human-caused warming: youtu.be/d8vqO2J8WV0

Today was the hottest day ever on record in France (nation avg). Parts of Paris hit 108°F, other cities hit 112! All-time France records total 214 this week! And the UK had its hottest June day ever at 97°. Few have Air Conditioning! #europe #heatwave (image via infoclimat)

Sacre Bleu! France 🇫🇷 at 112°F beats Florida’s all-time record high of 109°! And it’s further north by 20° lat. While that may seem crazy - and the heat in France is rare - because Florida is surrounded by water and so humid, it’s tougher to reach lofty highs than it is in a drier climate.

On 6/24 the Southwestern heatwave ramped up to a CAT2 and should become a major CAT 3 with the name of Bluestone the next couple of days, spreading over the U.S. next week. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherwest.bsky.social

On 6/24 the Southwestern heatwave ramped up to a CAT2 and should become a major CAT 3 with the name of Bluestone the next couple of days, spreading over the U.S. next week. My criteria: guyonclimate.com/2026/05/11/e @katharinehayhoe.com @michaelemann.bsky.social @weatherwest.bsky.social

Main Topic: European #HeatwaveEmber Ramps Up to a Catastrophic CAT5 via @bbc.co.uk.web.brid.gy On The Extreme Temperature Diary WED 6/24/2026 At: guyonclimate.com + #climate and record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social @hausfath.bsky.social

Main Topic: European #HeatwaveEmber Ramps Up to a Catastrophic CAT5 via @bbc.co.uk.web.brid.gy On The Extreme Temperature Diary WED 6/24/2026 At: guyonclimate.com + #climate and record temp reports @michaelemann.bsky.social @katharinehayhoe.com @drpauldorfman.bsky.social @hausfath.bsky.social

France just recorded its highest (30C/86F) daily nationwide temperature EVER. I'll discuss with the BBC at 4pm ET/ 9pm London local time today!

Excited to share the cover and an early endorsement from @rebeccasolnit.bsky.social for my forthcoming book, "The Carbon Wave." It's out Sept. 1! Preorders help the book travel further. The book is on sale this week with free shipping at Bookshop. Order your copy today! bookshop.org/p/books/the-...

EM-DAT says the 8 deadliest heat waves in world history were in Europe. This week's heat wave will surely make the list. But a 2026 paper (www.frontiersin.org/journals/env...) found 1-day extreme heat waves in India kill ~3,400 and 5-day heat waves kill ~30K, so proper India data is missing.

Main Topic: Is Climate Change Supercharging El Niño? A Debate Rages. Via @nytimes.com On The Extreme Temperature Diary TUE 6/23/2026 At: guyonclimate.com + #climate and record temp reports @katharinehayhoe.com @michaelemann.bsky.social @bhensonweather.bsky.social @climateofgavin.bsky.social