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Jeff Berardelli
@WeatherProf
WFLA-TV (Tampa Bay) Chief Meteorologist and Climate Specialist. BS Atmospheric Sciences Cornell U. MA Climate Columbia U. Past CBS News NY and Miami, Tampa, WPB
Tampa, FL
Joined November 2012
Posts
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    When I look at this jet stream the word insane comes to mind. It's even more astonishing when you consider it's mid June! This configuration, likely enhanced by climate heating, is fueling a record heat dome so extreme that even experts are astonished!
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    Life-threatening heat today in Puerto Rico so hot that some meteorologists are astonished. And more of the same to come this week. Heat index numbers as high as 115-125 today!! So what is going on? There are many factors, so let's dig in... thread 1/
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    One of the most surreal shots of #Helene from Kat P in Pass-a-Grille
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    Global temperatures from 1880-2021. @NASA visual using @ed_hawkins Warming Stripes.
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    This is the definition of compound, concurrent heat extremes! What you're looking at is the pressure pattern & wind flow at the 500mb level (5600 m, 18K ft). This is why Death Valley hit 129, the Med may hit 118, Iran heat index 152F and China hit an all-time heat record of 126.
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    Europe is having one of the most textbook Omega blocks in memory. A heat dome flanked by two strong storms. A true atmospheric stalemate/ traffic jam, dumping Epic rains in Greece. These split flow jet streams & extreme blocks are becoming more common esp in Europe 1/
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    Report says world's wealthiest 1% produce double the combined carbon emissions of the poorest 50%, according to the UN. The wealthiest 5% alone – the so-called “polluter elite” - contributed 37% of emissions growth between 1990 and 2015.
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    The Arctic is more than 12 degrees above normal. Repeat: the average for the entire Arctic is 12 degrees above what was normal in 1990. Would be even more extreme compared to pre-industrial.
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    Alert: #Milton may threaten #TampaBay midweek. I’m not an alarmist, it takes a lot to get my attention. This has it. If Milton landfalls at or just north of Tampa Bay as a cat 2-3 hurricane, it means up to double #Helene storm surge. And extensive, long term power outages 1/
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    Rarely if ever do you see a swing in temperatures like this. From historic heat to record cold.
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    The massive rain bomb in #Dubai - 6”- almost 2 years of rain in a day, was due to a very blocked pattern and slow moving southern jet stream with embedded disturbances. That’s the primary cause. Could cloud “seeding” have enhanced it? Maybe, but something else was going on… 1/
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    Amazed by how wavy/ extreme this jet stream structure is. Record warm oceans, developing El Nino, Typhoon Mawar wave breaking, climate change ice melt & uneven heating of the Arctic vs mid-latitudes. Excess energy = extremes. And we ain't seen nothing yet. 1/
    GIF
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    Tampa Bay is the most vulnerable city in the US to hurricanes, because of the extensive water front population/ property and a huge bay that funnels surge. A worst case scenario is a landfall north of the mouth of the Bay. Circulation forces water up/ into nooks/ crannies 🧵
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    A testament to how extreme & overwhelming the climate is this summer is, this Record “Shattering” heat dome has been barely covered by the national media. It’s largest US heat dome in recent memory and in a large part of the nation’s middle the most intense, by a long shot. 1/
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