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US-POLITICS-BIDEN

More than 180 million people are under heat alerts across the United States on Friday as dangerously hot conditions peak in the Mid-Atlantic and Northeast, persist in the Desert Southwest, and tighten their grip over the south central states.

On the Eastern Seaboard, a punishing combination of heat and humidity has triggered excessive heat warnings <a href="https://www.weather.gov/" target=_blank>stretching</a> from northeast North Carolina, through Virginia Beach, Richmond, Washington, Philadelphia and into north central New Jersey.

Heat warnings are also in effect for parts of the Desert Southwest, including Phoenix, and a large portion of the central Plains and Midwest, including Kansas City, Omaha, Des Moines, St. Louis and Springfield, Ill. Another patch of heat warnings includes Dayton and Cincinnati, with yet another around Charleston, W.Va.

Check to see if extreme heat could pose a major threat to your area

All the locations under warnings are anticipating heat indexes, a measure of how hot it feels factoring in humidity, of around 110 degrees or higher Friday afternoon. Air temperatures in these areas are forecast to approach or surpass 100 degrees.

Heat advisories surround the heat warning zones and cover most of the central states, Mid-Atlantic and Northeast, including Chicago, Cleveland, Nashville and Little Rock, among others. “Dangerous heat will engulf much of the eastern half,” of the United States, the Weather Prediction Center wrote Friday. “Some locations in the Northeast and Mid-Atlantic can expect their hottest temperatures so far in 2023.”

The heatwave in much of the Midwest and Northeast will be mercifully short, with more seasonable air arriving over the weekend. In the southern and southwest United States, however, little relief is forecast any time soon.

High temperatures are set to flirt with 100 degrees on Friday over a large swath of the Mid-Atlantic. A record high is possible in Washington, which is forecast to hit 100 degrees for the first time since 2016. Record highs could occur in Trenton, N.J., and Atlantic City, where it is set to hit 97 degrees. Toward the central states, Jefferson City, Mo., and Peoria, Ill., could challenge record highs of 104 and 101, respectively.

On the heels of a sultry night, a slew of record warm minimum temperatures are also slated to fall. Some locations in the Midwest and Central Plains failed to drop below 80 degrees by Friday morning, including St. Louis, which dipped to 85 degrees to mark the second warmest low on record there if it holds.

Numerous record warm lows will also be clinched on Friday after morning minimums in the 70s to near 80. Another big round of record warm lows is on the way Saturday from the Midwest to the Eastern Seaboard. Scorching afternoon heat will linger in much of the Mid-Atlantic below southern Pennsylvania, with highs in the 90s to around 100 again.

Similar readings are projected from the foothills of the Appalachian Mountains in West Virginia to northern Missouri and southward. While much of the Eastern Seaboard gets relief from the hot weather by Sunday, it will intensify over much of Texas and into parts of the South. Temperatures around 100 degrees on Friday in Dallas will rise close to 105 degrees on Monday and hover at those levels well into next week.

Heat starts relenting Friday in the Northern Plains as a cold front from Canada moves through the region. That front progresses east and southeast over the next several days. By Saturday, cooler conditions will press into the Great Lakes as well as Upstate New York and northern New England. Sunday should have cooler than average highs from northern Virginia to Maine and through the Upper Midwest. Much of next week may feature cooler than average conditions in the Northeast.

It is also probable that cooler conditions over the Pacific Northwest will expand after this weekend. This cooler air will eventually extend into the intermountain west, and perhaps even briefly into the Desert Southwest. Moving into August, it appears the most extreme heat relative to normal will focus in western United States and western Canada, perhaps including Alaska. Beyond the first week of the new month, the picture is less clear, but no significant cooldowns yet seem on tap in the long term.

Mario Tama

Although temperatures in Phoenix finally fell below 90 degrees on Thursday, for the first time since July 9, excessively hot <a href="https://www.twitter.com/nwsphoenix/status/1684572176039698432" target=_blank>afternoons</a> have not eased. Phoenix hit 115 degrees on Thursday to mark a record 15th time this year at or above 115. The city has now seen 44 days in a row at or above 100 degrees and 78 days in a row at or above 90 degrees, the longest ongoing streaks in the country of any National Weather Service climate sites.

El Paso also notched another day at or above 100 degrees, making 42 days in a row there, the longest run on record by 19 days. Austin has now had 20 straight days at or above 100 degrees, with no end in sight. One other streak of excessively hot weather ended Thursday. Stormy weather in south Florida, including a calendar day record of nearly 6.2 inches of rain in Fort Lauderdale, held temperatures back some.

So the record streak in Miami of 46 straight days with a heat index at or above 100 degrees concluded. It beat the next longest run by 14 days and <a href="https://bmcnoldy.earth.miami.edu/mia/" target=_blank>contributed</a> to heat indexes at or above 105 degrees for a record 84 hours so far this year.

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.

Ian Livingston

Hottest weather of summer so far grips central and eastern states

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