305
FXUS01 KWBC 090758
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
357 AM EDT WED AUG 09 2023
VALID 12Z WED AUG 09 2023 - 12Z FRI AUG 11 2023
...DANGEROUS HEAT WILL PERSIST ACROSS MUCH OF THE SOUTHERN TIER OF
THE U.S....
...SEVERE STORMS EXPECTED TODAY FROM EASTERN KANSAS AND OKLAHOMA
TO THE LOWER OHIO AND TENNESSEE VALLEYS...
...ELEVATED TO CRITICAL FIRE WEATHER CONDITIONS EXPECTED TODAY
ACROSS FROM PARTS OF SOUTH TEXAS TO FAR SOUTHERN OKLAHOMA...
HEAT ADVISORIES AND EXCESSIVE HEAT WARNINGS REMAIN IN PLACE FROM
PORTIONS OF SOUTHEASTERN NEW MEXICO TO FLORIDA AND SOUTHERN
GEORGIA, WHERE ABOVE-NORMAL TO RECORD-BREAKING HEAT WILL CONTINUE
THROUGH THE PERIOD. THE COMBINATION OF HEAT AND HUMIDITY WILL
RESULT IN DANGEROUS HEAT INDICES, POSSIBLY CLIMBING ABOVE 110F IN
SOME LOCATIONS. OPPRESSIVE DAYTIME HEAT, LIMITED OVERNIGHT
COOLING, AND WIDESPREAD RECORD WARM OVERNIGHT LOWS WILL POSE A
SIGNIFICANT HEALTH RISK, ESPECIALLY FOR THOSE WITHOUT EFFECTIVE
COOLING AND ADEQUATE HYDRATION.
IN ADDITION TO THE HEAT, DRY AND BREEZY CONDITIONS WILL CONTRIBUTE
TO ELEVATED TO CRITICAL FIRE WEATHER CONDITIONS FROM PORTIONS OF
SOUTH TEXAS TO FAR SOUTHERN OKLAHOMA TODAY.
FARTHER TO THE NORTH, MOIST AND UNSTABLE AIR MOVING OUT AHEAD OF
AN AREA OF LOW PRESSURE TRACKING THROUGH THE PLAINS AND ALONG ITS
TRAILING COLD FRONT IS EXPECTED TO SUPPORT THUNDERSTORM
DEVELOPMENT TODAY FROM EASTERN KANSAS AND OKLAHOMA EASTWARD INTO
THE LOWER OHIO AND TENNESSEE VALLEYS. SOME OF THESE STORMS MAY
BECOME STRONG TO SEVERE -- PRODUCING HAIL, DAMAGING WINDS, AND
TORNADOES. HEAVY RAIN IS A THREAT AS WELL, WITH ISOLATED TO
SCATTERED FLASH FLOODING POSSIBLE. BY THURSDAY, THE GREATER
THREAT FOR HEAVY RAIN IS EXPECTED TO SHIFT INTO THE SOUTHERN
APPALACHIANS, WITH SEVERE STORMS MORE LIKELY TO DEVELOP OVER THE
CAROLINAS, EAST OF THE MOUNTAINS.
ACROSS THE NORTHERN TIER OF THE U.S., SHOWERS AND THUNDERSTORMS
ARE EXPECTED TO FOCUS NEAR A FRONT DROPPING INTO THE UPPER MIDWEST
AND NORTHERN PLAINS TODAY, AND THEN AHEAD OF AN AREA OF LOW
PRESSURE MOVING OUT OF THE ROCKIES TONIGHT AND THEN ACROSS THE
NORTHERN PLAINS THURSDAY INTO EARLY FRIDAY. ISOLATED SEVERE
STORMS AND FLASH FLOODING MAY DEVELOP ACROSS THESE AREAS.
IN THE WEST, TEMPERATURES ARE FORECAST TO REMAIN SEASONAL TO BELOW
AVERAGE THROUGH THE PERIOD. SCATTERED SHOWERS AND THUNDERSTORMS
CAN BE EXPECTED ACROSS PORTIONS OF THE SOUTHWEST TODAY, BEFORE
EXPANDING INTO PARTS OF THE GREAT BASIN AND THE SOUTHERN TO
CENTRAL ROCKIES ON THURSDAY.
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