794
FXUS01 KWBC 011916
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
316 PM EDT FRI SEP 01 2023
VALID 00Z SAT SEP 02 2023 - 00Z MON SEP 04 2023
...HEAVY RAINS AND A FLASH FLOODING THREAT FROM THE SOUTHWEST INTO
THE GREAT BASIN, NORTHERN CALIFORNIA AND ALONG THE CENTRAL TO
EASTERN GULF COAST...
...MUCH ABOVE AVERAGE TEMPERATURES EXPECTED THROUGH ALL OF THE
PLAINS SATURDAY AND SUNDAY, SPREADING EAST INTO THE NORTHEAST BY
SUNDAY...
..SMOKE FROM CANADIAN WILDFIRES TO PUSH ALONG THE NORTHERN TIER
FROM THE UPPER MISSISSIPPI VALLEY TO NEW ENGLAND...
A STRONG MID TO UPPER LEVEL LOW IS EXPECTED TO REMAIN NEARLY
STATIONARY OVER THE NEXT FEW DAYS ALONG THE NORTHERN CALIFORNIA
COAST WHILE AN UPPER RIDGE BUILDS FROM THE PLAINS INTO THE MID
MISSISSIPPI VALLEY. THE SOUTHERLY FLOW ON THE EAST SIDE OF THE
CALIFORNIA LOW AND THE SOUTHERLY FLOW ON THE WEST SIDE OF THE
PLAINS UPPER RIDGE WILL PUSH MUCH ABOVE AVERAGE MOISTURE VALUES
NORTH FROM THE SOUTHWEST INTO THE GREAT BASIN, NORTHERN CALIFORNIA
AND THE NORTHERN ROCKIES. ACTIVE SHOWERS AND THUNDERSTORMS
EXPECTED IN THIS HIGH MOISTURE AXIS, SUPPORTING HEAVY RAIN
POTENTIAL AND ISOLATED FLASH FLOODING FOR THE UPCOMING HOLIDAY
WEEKEND. ACROSS PORTIONS OF THESE REGIONS, FLOOD WATCHES ARE
CURRENTLY IN EFFECT.
HEAVY RAINS AND ISOLATED FLASH FLOODING ALSO POSSIBLE ACROSS
PORTIONS OF THE CENTRAL TO EASTERN GULF COAST. WHILE IDALIA HAS
MOVED WELL OFF THE EAST COAST, AN AXIS OF ABOVE AVERAGE MOISTURE
VALUES TRAILING FROM THIS STORM WILL LINGER ACROSS THESE REGIONS
OVER THE NEXT TWO DAYS. HEAVY RAINS ARE POSSIBLE IN THIS ABOVE
AVERAGE MOISTURE AXIS, WITH ISOLATED FLASH FLOODING POSSIBLE,
ESPECIALLY ACROSS EASTERN PORTIONS OF THE THE FLORIDA PANHANDLE
AND NORTHWEST FLORIDA THAT RECEIVED HEAVY RAINS RECENTLY FROM
IDALIA.
INCREASINGLY HOT WEATHER ON TAP FOR LARGE PORTIONS OF THE NATION
THIS WEEKEND AS AN UPPER HIGH STRENGTHENS ACROSS THE CENTRAL
PLAINS AND MID MISSISSIPPI VALLEY REGION ON SATURDAY AND EXPANDS
EASTWARD SUNDAY INTO THE OHIO VALLEY. THE CORE OF THE ABOVE
AVERAGE TEMPERATURES ON SATURDAY WILL STRETCH ACROSS ALL OF THE
PLAINS AND INTO THE UPPER MISSISSIPPI VALLEY WHERE HIGH
TEMPERATURES FROM THE UPPER 90S TO LOWER 100S ARE FORECAST. THIS
MUCH ABOVE AVERAGE TEMPERATURES WILL CONTINUE INTO SUNDAY ACROSS
THE PLAINS AND UPPER MISSISSIPPI VALLEY AND ALSO SPREAD EASTWARD
INTO THE GREAT LAKES, OHIO VALLEY AND MID-ATLANTIC. A FEW RECORD
HIGHS ARE POSSIBLE ON SATURDAY ACROSS THE PLAINS INTO THE UPPER
MISSISSIPPI VALLEY, WITH A MORE EXPANSIVE RECORD HIGH POTENTIAL ON
SUNDAY ACROSS THESE AREAS. THE POTENTIAL FOR RECORD HIGH
TEMPERATURES WILL ALSO SPREAD INTO PORTIONS OF THE GREAT LAKES AND
MID-ATLANTIC FOR THE LABOR DAY HOLIDAY ON MONDAY.
PREDOMINANTLY WESTERLY MID TO UPPER LEVEL FLOW EXPECTED ACROSS
SOUTHERN CANADA AND THE NORTHERN TIER OF THE U.S. OVER THE NEXT
FEW DAYS. THIS WILL BE TRANSPORTING SMOKE FROM THE PERSISTENT
CANADIAN WILDFIRES EASTWARD, AFFECTING REGIONS OF THE NORTHERN
TIER OF THE LOWER 48 FROM THE UPPER MISSISSIPPI VALLEY, ACROSS THE
UPPER GREAT LAKES, NORTHERN NEW YORK STATE AND MUCH OF NEW ENGLAND.
ORAVEC
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