003
FXUS01 KWBC 261922
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
322 PM EDT MON AUG 26 2024
VALID 00Z TUE AUG 27 2024 - 00Z THU AUG 29 2024
...MUCH ABOVE AVERAGE TEMPERATURES/RECORD HEAT TO STRETCH FROM THE
MID WEST TO THE EAST COAST...
...ACTIVE SHOWERS AND THUNDERSTORMS EXPECTED AROUND THE
PERIPHERIES OF THE MID WEST TO EASTERN HEAT WITH HEAVY RAINS,
FLASH FLOODING AND SEVERE WEATHER POSSIBLE...
THE CLOSED UPPER HIGH CURRENTLY CENTERED OVER THE MID MISSISSIPPI
VALLEY/OHIO VALLEY REGION WILL BE EXPANDING EASTWARD OVER THE NEXT
TWO DAYS, SPREADING INTO LARGE PORTIONS OF THE EAST COAST FROM THE
MID-ATLANTIC SOUTHWARD. THIS WILL SUPPORT AN EASTWARD EXPANSIONS
OF MUCH ABOVE AVERAGE TEMPERATURES INTO THE MIDDLE PART OF THIS
WEEK WITH HIGH TEMPERATURES TUESDAY AND WEDNESDAY ANYWHERE FROM 10
TO 15 DEGREES ABOVE AVERAGE. THIS WILL SUPPORT THE POTENTIAL FOR
RECORD HIGH TEMPERATURES IN THE MIDDLE TO UPPER 90S OVER THE NEXT
SEVERAL DAYS FROM THE MID WEST, INTO THE OHIO VALLEY, TENNESSEE
VALLEY, SOUTHERN TO CENTRAL APPALACHIANS AND INTO THE MID-
ATLANTIC. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
LEVELS WILL PRODUCE MAXIMUM DAILY HEAT INDICES OF BETWEEN 105 AND
115 DEGREES F ACROSS THESE REGIONS WITH MAJOR TO EXTREME HEAT
RISKS. EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES ARE CURRENTLY
IN EFFECT ACROSS THE MID TO UPPER MISSISSIPPI VALLEY, THE MID WEST
AND SOUTHERN NEW ENGLAND, AFFECTING NEARLY 61 MILLION PEOPLE, WITH
FURTHER EXPANSION OF THESE WARNINGS AND ADVISORIES POSSIBLE INTO
PORTIONS OF THE MID-ATLANTIC OVER THE NEXT TWO DAYS.
AROUND THE PERIPHERIES OF THE ABOVE MENTIONED UPPER HIGH,
PRECIPITATION IS LIKELY TO BE ACTIVE ACROSS THE GULF COAST AND
FROM PORTIONS OF THE SOUTHWEST, NORTHEASTWARD INTO THE CENTRAL
PLAINS, UPPER MISSISSIPPI VALLEY, UPPER GREAT LAKES INTO NORTHERN
NEW ENGLAND. IN THESE REGIONS, MOISTURE VALUES ARE FORECAST TO
REMAIN ABOVE AVERAGE, SUPPORTING THE POTENTIAL FOR AREAS OF ACTIVE
THUNDERSTORMS, HEAVY RAINS AND FLASH FLOODING. IN ADDITION, THESE
THUNDERSTORMS WILL ALSO SUPPORT POTENTIAL FOR SEVERE WEATHER,
ESPECIALLY ACROSS EASTERN PORTIONS OF THE CENTRAL TO NORTHERN
PLAINS, UPPER MISSISSIPPI VALLEY AND UPPER LAKES MONDAY NIGHT INTO
EARLY TUESDAY AND ACROSS PORTIONS OF THE LOWER GREAT LAKES TUESDAY
AFTERNOON INTO TUESDAY EVENING/NIGHT.
WHILE MUCH ABOVE TO RECORD HIGHS DOMINATE PORTIONS OF THE CENTRAL
TO EASTERN U.S. INTO MID WEEK, A STRONG FRONT WILL BE PUSHING
INLAND INTO THE PACIFIC NORTHWEST TONIGHT INTO TUESDAY, THROUGH
THE NORTHERN ROCKIES AND INTO THE NORTHERN HIGH PLAINS BY TUESDAY
EVENING. MUCH BELOW AVERAGE TEMPERATURES LIKELY IN THE WAKE OF
THIS FRONT ACROSS THE PACIFIC NORTHWEST ON TUESDAY AND INTO THE
NORTHERN ROCKIES/NORTHERN HIGH PLAINS ON WEDNESDAY, WITH HIGH
TEMPERATURES 10 TO 20 DEGREES BELOW AVERAGE. THERE IS NOT
EXPECTED TO BE A LOT OF PRECIPITATION WITH THIS FRONT OVER THE
NORTHWEST, BUT THE FALLING TEMPERATURES WILL SUPPORT AT LEAST SOME
LIGHT SNOWFALL AMOUNTS ACROSS THE NORTHERN ROCKIES OF MONTANA.
ORAVEC
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