According to the NWS office here in Louisville, a heat burst has been ruled the most likely culprit of some high winds at or just below 60 mph in several counties to our west and southwest. Here's what they said:
IT IS LIKELY A HEAT BURST OCCURRED IN THE
DAVIESS/SPENCER COUNTY AREA BORDERING OUR NWRN CWA AROUND 3 PM EDT.
A STORM REPORT FROM THERE INDICATED EXTREME HEAT-LIKE A BLOW TORCH-
ALONG WITH HIGH WINDS (50-60 MPH WINDS). THESE WINDS DROPPED ESE
INTO PARTS OF HANCOCK...BRECKINRIDGE...HARDIN...OHIO AND GRAYSON
COUNTIES WHERE THE ELIZABETHTOWN MESONET RECORDED A WIND GUST NEAR
60 MPH AND A COINCIDING RISE IN TEMP/DROP IN DEWPOINT. THIS WAS ALL
BEHIND DECAYING TSTMS.
From what I've read in historical accounts about heat bursts, most of the well-documented ones occurred at night or very early morning. I've read of temperatures rising from near 80 to well over 100 in a span of a few minutes during the middle of the night. Although these are rare, they are even more uncommon during the daylight hours (at least the heat aspect of it).
The most recent heat burst of note was in Wichita KS a few weeks ago when the temperature spiked 17 degrees in 20 minutes (85 at 12:22am to 102 at 12:42am) accompanied by 50-60 mph winds.
Just goes to show we have seen it all this year when it comes to the weather.
MS
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