312
FXUS01 KWBC 200824
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
423 AM EDT THU MAR 20 2025
VALID 12Z THU MAR 20 2025 - 12Z SAT MAR 22 2025
...MAJOR LATE WINTER/EARLY SPRING SNOWSTORM TO PUSH INTO THE UPPER
MISSISSIPPI VALLEY AND GREAT LAKES...
...SEVERE WEATHER POSSIBLE THIS EVENING ACROSS MUCH OF ILLINOIS
AND INDIANA...
...LIGHT TO MODERATE SNOW OVER THE CASCADES AND NORTHERN
INTERMOUNTAIN REGION; LIGHT SNOW OVER THE GREAT LAKES, CENTRAL
APPALACHIANS, AND NORTHEAST...
...THERE IS A CRITICAL RISK OF FIRE WEATHER OVER THE PARTS OF THE
SOUTHERN HIGH PLAINS AND FLORIDA ON THURSDAY AND AN ELEVATED RISK
OVER THE CENTRAL/SOUTHERN PLAINS AND MIDDLE/LOWER MISSISSIPPI
VALLEY ON FRIDAY...
A FRONT EXTENDING FROM THE LOWER GREAT LAKES TO THE EASTERN GULF
COAST WILL MOVE OFF THE EAST COAST BY FRIDAY EVENING. THE SYSTEM
WILL PRODUCE LIGHT SNOW OVER THE GREAT LAKES AND RAIN OVER PARTS
OF THE LOWER GREAT LAKES/OHIO VALLEY TO THE CENTRAL GULF COAST ON
THURSDAY MORNING. BY THURSDAY AFTERNOON INTO EVENING, SHOWERS AND
THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE NORTHERN MID-ATLANTIC
TO THE SOUTHERN MID-ATLANTIC. RAIN WILL ALSO FALL OVER PARTS OF
THE SOUTHEAST. IN ADDITION, LIGHT SNOW WILL DEVELOP OVER PARTS OF
THE CENTRAL APPALACHIANS, ENDING BY FRIDAY MORNING. FURTHER, LIGHT
RAIN AND SNOW WILL MOVE INTO THE NORTHEAST OVERNIGHT THURSDAY,
WITH THE LAST OF THE LIGHT SNOW AND RAIN OCCURRING BY FRIDAY
EVENING.
MEANWHILE, ON THURSDAY, A FRONT OVER THE NORTHERN INTERMOUNTAIN
REGION TO SOUTHERN CALIFORNIA WILL MOVE EASTWARD TO THE NORTHERN
PLAINS TO THE CENTRAL HIGH PLAINS OVERNIGHT THURSDAY. ON THURSDAY,
THE BOUNDARY WILL PRODUCE LIGHT SNOW OVER THE NORTHERN
INTERMOUNTAIN REGION AND NORTHERN ROCKIES. THE FRONT WILL BE
USHERED BY A THIRD FRONT MOVING OUT OF CENTRAL CANADA INTO THE
NORTHERN PLAINS OVERNIGHT THURSDAY. BY SATURDAY, THE TWO FRONTS
WILL MOVE EASTWARD TO THE LOWER GREAT LAKES AND SOUTHWARD TO THE
LOWER MISSISSIPPI VALLEY/SOUTHERN PLAINS AND MIDDLE MISSISSIPPI
VALLEY, RESPECTIVELY.
BY FRIDAY EVENING, THE SYSTEMS WILL PRODUCE LIGHT SNOW OVER THE
UPPER GREAT LAKES INTO THE UPPER MISSISSIPPI VALLEY. SHOWERS AND
THUNDERSTORMS WILL ALSO DEVELOP OVER PARTS OF THE MIDDLE
MISSOURI/MIDDLE MISSISSIPPI VALLEYS ON FRIDAY. MOREOVER, LIGHT
RAIN WILL MOVE INTO THE OHIO VALLEY AND LOWER GREAT LAKES
OVERNIGHT ON FRIDAY.
FURTHERMORE, ON THURSDAY, UPPER-LEVEL ENERGY AND WEAK ONSHORE FLOW
WILL AID IN PRODUCING COASTAL RAIN AND HIGHER-ELEVATION SNOW OVER
THE PACIFIC NORTHWEST AND INTO PARTS OF NORTHERN CALIFORNIA. EARLY
FRIDAY MORNING, A FOURTH FRONT WILL MOVE ONSHORE OVER THE
NORTHWEST, ADVANCING TO THE NORTHERN ROCKIES, AND THEN EXTEND
ROUGHLY SOUTHWESTWARD TO SOUTHERN OREGON. COASTAL RAIN AND
HIGHER-ELEVATION SNOW WILL CONTINUE INTO SATURDAY OVER PARTS OF
THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA.
ON THURSDAY, THE SPC ISSUED A CRITICAL RISK OF FIRE WEATHER OVER
PARTS OF THE SOUTHERN HIGH PLAINS AND FLORIDA. ON FRIDAY THE FIRE
WEATHER THREAT WILL LESSEN TO AN ELEVATED RISK OVER PART OF THE
CENTRAL/SOUTHERN PLAINS AND MIDDLE/LOWER MISSISSIPPI VALLEY.
ZIEGENFELDER
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