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August 2, 2010 / Dave Gorham

Above-Average Temperatures Expected in August

It was a hot weekend across much of the Southern Plains and Southeast with highs in the upper 90’s. A few areas even topped off in the low 100’s. When you factor in both the heat and humidity you get the heat index, which is basically how hot it really feels outside. The heat index across much of the Southern Plains and Southeast this weekend was between 100-110ºF with a few areas above 110ºF. On Friday, the National Weather Service in Charleston, South Carolina issued an Excessive Heat Warning for Southeast South Carolina and Southeast Georgia until as late as 9pm (Eastern Time). Highs climbed into the upper 90’s to low 100’s across this region and heat index values soared up to near 120ºF along the East coast.


An Excessive Heat Warning is issued when extreme heat index values make it feel very hot, typically above 105°F (41°C) for 3 hours or more during the day for two consecutive days or above 115°F (46°C) for any length of time. Specific criteria varies for different county warning areas. Image: National Weather Service

Areas highlighted in orange indicate the excessive heat over the Southern Plains and Southeast on Friday. Image: ImpactWeather

The heat continued throughout the weekend with heat index values across the Southern Plains and much of the Southeast between 105-112ºF. The hot and humid weather is expected to continue throughout the week with highs well into the upper 90’s/low 100’s and heat index values between 100-110ºF.

Excessive heat (orange) expected today across the Central/Southern Plains and much of the Southeast. Isolated severe storms (red) will be possible across the lower Southeast as a weak front and plenty of moisture interacts with the strong daytime heating. Image: ImpactWeather

If you’re like me, you can’t wait until the cooler weather arrives and you’re counting down the days to fall. The first day of fall this year is on Wednesday, September 22 so we still have a little over a month and a half to go. (Well, exactly 52 days away, but who’s counting?) It doesn’t look like August will be any kinder to us in terms of the heat as much of the lower 48 will see above-average temperatures (see image below) as a stronger than normal upper-level high pressure system prevails. The warmest weather is expected from the Central and Northern Rockies, eastward across the Central and Northern Plains, Mid and Upper Mississippi Valley, Ohio Valley, Great Lakes and the Northeast. Farther south, near normal temperatures are expected along the West Coast and from southern Arizona and New Mexico eastward across the Gulf Coast states.


Temperature outlook for August, 2010. Image: ImpactWeather

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