979
FXUS01 KWBC 060806
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
405 AM EDT SUN AUG 06 2023
VALID 12Z SUN AUG 06 2023 - 12Z TUE AUG 08 2023
...EXPANSIVE HEAT WAVE TO CONTINUE FROM THE DESERT SOUTHWEST TO
THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY, BUT RELIEF
COMING TO OKLAHOMA AND ARKANSAS...
...SEVERE THUNDERSTORMS EXPECTED FOR THE OHIO AND TENNESSEE
VALLEYS TODAY, SPREADING EASTWARD INTO THE APPALACHIANS,
MID-ATLANTIC AND SOUTHEAST FOR MONDAY...
...FLASH FLOOD THREATS FOR PORTIONS OF THE MIDWEST, NORTHERN
MID-ATLANTIC/NORTHEAST AND INTERIOR NORTHWEST...
EXCESSIVE HEAT WARNINGS REMAIN IN EFFECT TODAY ACROSS CENTRAL AND
EASTERN TEXAS TO THE CENTRAL GULF COAST AND AS FAR NORTH AS
SOUTHERN ARKANSAS AND CENTRAL MISSISSIPPI. EXCESSIVE HEAT WARNINGS
ARE ALSO IN EFFECT FOR A PORTION OF THE FLORIDA PANHANDLE AND
DESERT SOUTHWEST. TODAY'S HIGH TEMPERATURES ACROSS TEXAS INTO THE
LOWER MISSISSIPPI VALLEY WILL AGAIN REACH INTO THE LOW TO MID-100S
WITH HEAT INDEX VALUES ECLIPSING 110 DEGREES DURING THE AFTERNOON
HOURS. HOWEVER, SOME SUPPRESSION OF THE UPPER LEVEL RIDGE IN PLACE
OVER THE SOUTHERN TIER STATES WILL OCCUR OVER THE NEXT 1-2 DAYS AS
A STRONG STORM SYSTEM (BY AUGUST STANDARDS) MAKES ITS WAY ACROSS
THE MIDWEST TODAY AND TOWARD THE MID-ATLANTIC AND NORTHEAST ON
MONDAY. AN ACCOMPANYING COLD FRONT WILL DROP SOUTHEASTWARD THROUGH
MISSOURI/OKLAHOMA/ARKANSAS THROUGH TONIGHT, BRINGING HIGH
TEMPERATURES CLOSER TO SEASONAL AVERAGES IN ITS WAKE FOR OKLAHOMA
INTO ARKANSAS TODAY WITH TEMPERATURES FALLING BELOW AVERAGE ACROSS
OKLAHOMA/ARKANSAS AND THE MIDWEST BEHIND THE COLD FRONT FOR
MONDAY.
WITH THE RELATED SURFACE LOW TRACKING EAST FROM SOUTH DAKOTA INTO
THE MIDWEST TODAY, SEVERE THUNDERSTORMS ARE EXPECTED TO SET UP
AHEAD OF THE COLD FRONT AND NEAR A WARM FRONT FROM THE OHIO VALLEY
INTO THE TENNESSEE VALLEY. THE SEVERE WEATHER THREAT WILL
TRANSLATE EASTWARD FOR MONDAY, COVERING A LARGE PORTION OF THE
EASTERN U.S. THUNDERSTORMS PRODUCING HEAVY RAIN WILL INCREASE
FLASH FLOOD POTENTIAL FROM PARTS OF THE MIDDLE MISSISSIPPI VALLEY
TODAY INTO THE NORTHERN MID-ATLANTIC AND NORTHEAST FOR MONDAY.
ACROSS THE NORTHWESTERN U.S., A SERIES OF UPPER LEVEL DISTURBANCES
WILL MOVE INTO THE REGION, BRINGING A THREAT FOR AFTERNOON/EVENING
THUNDERSTORMS AND FLASH FLOOD POTENTIAL BOTH TODAY AND SUNDAY,
WITH A PARTICULAR FOCUS OVER NORTHERN WASHINGTON INTO NORTHERN
IDAHO.
OTTO
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