I hope everyone has their pools open and ready as the Eastern US is going straight to the furnace in the next few days.

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Mostly geotropical currents (west-to-east flow with very little amplification by gullies or trenches) have kept heat confined to the southern and central parts of the country over the past few days. That will change, however, when a bottom digs in the northwestern United States, forcing the ridge to amplify and shift eastward.

So the heat limited to the south today will move north and east, leaving a large portion of this half of the country toasted by the weekend.

According to NWS data, this heatwave will bring the first 90 degrees of heat of the season to several major southern cities – like Atlanta, Charlotte and Knoxville (to name just a few).

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Not only will it be hot, but it will probably be the hottest on record. Filing may drop from West Texas to the Northeast by the time the weekend closes. Some of these are also age-old records.

Knoxville, TN will challenge a record that has stood since 1941 (81 years) on Friday

Charlotte, NC will challenge a record that has stood since 1962 (60 years) on Thursday and then again on Friday (1964).

Fayetteville, NC will challenge a record that has stood since 1938 (84 years) on Friday.

The Washington, DC and Philadelphia, PA areas will challenge records that have stood since 1934 (88 years) on Saturday.

I could go on, but now you get the hang of it: this is going to be a pretty strong early-season heatwave.

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In addition to sweltering daytime temperatures, the likelihood of a record-high minimum is widespread.

But why is this important?

Well, when the nighttime minimum is still higher after a hot day, it doesn’t give the body much of a chance to recover to the daytime temperature. Without that opportunity to cool off, heat exhaustion is much more likely. This is mainly a concern when the night-time minimum is somewhere above 70/80. But for some, especially those further north, who are used to colder nights, warmer temperatures overnight will be something of a different feeling coming from a Spring is cooler.

No matter where you are in the Eastern US for the rest of this week, remember there are ways to stay cool not only during the day but also at night. Drink plenty of water and try to avoid the sun during peak heating hours.

Temperatures are cooler, closer to average temperatures again after the weekend.

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