157
FXUS01 KWBC 121919
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
218 PM EST THU DEC 12 2024
VALID 00Z FRI DEC 13 2024 - 00Z SUN DEC 15 2024
...MODERATE TO HEAVY LAKE-EFFECT SNOW DOWNWIND FROM LAKE ONTARIO
ON FRIDAY; LIGHT TO MODERATE LAKE-EFFECT SNOW DOWNWIND FROM MOST
OF THE GREAT LAKES THURSDAY EVENING INTO FRIDAY...
...MODERATE TO HEAVY SNOW OVER PARTS OF THE SIERRA NEVADA
MOUNTAINS AND THE NORTHERN INTERMOUNTAIN REGION ON FRIDAY EVENING
INTO SATURDAY; 0.10 INCHES OF RAIN/FREEZING RAIN OVER PARTS OF THE
MIDDLE MISSISSIPPI VALLEY ON FRIDAY EVENING INTO SATURDAY...
...TEMPERATURES WILL BE 10 TO 20 DEGREES BELOW AVERAGE OVER PARTS
OF THE UPPER MIDWEST...
A FRONT OVER PARTS OF THE SOUTHWEST/SOUTHERN CALIFORNIA WILL MOVE
EASTWARD TO THE MIDDLE/LOWER MISSISSIPPI VALLEY AND SOUTHERN
PLAINS BY SATURDAY. MOISTURE ASSOCIATED WITH THE SYSTEM WILL
PRODUCE COASTAL RAIN AND HIGHER-ELEVATION SNOW OVER PARTS OF THE
PACIFIC NORTHWEST AND NORTHERN CALIFORNIA ON THURSDAY AFTERNOON.
OVERNIGHT THURSDAY, THE RAIN AND HIGHER-ELEVATION SNOW WILL MOVE
INTO CENTRAL CALIFORNIA. THE RAIN AND HIGHER-ELEVATION SNOW WILL
CONTINUE INTO SATURDAY OVER PARTS OF THE NORTHWEST AND CALIFORNIA.
ON FRIDAY, ANOTHER FRONT OVER THE EASTERN PACIFIC WILL MOVE
ONSHORE OVER PARTS OF THE NORTHWEST AND CALIFORNIA AND MOVE INLAND
AS FAR EASTWARD AS THE NORTHERN INTERMOUNTAIN REGION BY SATURDAY.
THE STORM WILL PRODUCE MORE COASTAL RAIN AND HIGHER-ELEVATION SNOW
OVER PARTS OF THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA.
ADDITIONAL MOISTURE WILL MOVE ONSHORE FRIDAY EVENING, PRODUCING
MODERATE TO HEAVY SNOW OVER PARTS OF THE SIERRA NEVADA MOUNTAINS
AND THE NORTHERN INTERMOUNTAIN REGION THROUGH SATURDAY.
MEANWHILE, ON FRIDAY INTO SATURDAY, AS THE LEAD FRONT MOVES INTO
THE MIDDLE/LOWER MISSISSIPPI VALLEY AND SOUTHERN PLAINS, RETURN
FLOW OFF THE GULF OF MEXICO WILL START TO STREAM NORTHWARD OVER
PARTS OF THE SOUTHERN PLAINS, PRODUCING SHOWERS AND THUNDERSTORMS.
THE SHOWERS AND THUNDERSTORMS WILL EXPAND NORTH AND EASTWARD INTO
THE MIDDLE/LOWER MISSISSIPPI VALLEY ON SATURDAY. IN ADDITION, RAIN
WILL MOVE INTO THE OHIO AND TENNESSEE VALLEYS ON SATURDAY.
ADDITIONALLY, OVERNIGHT FRIDAY, AS THE MOISTURE STREAMS FARTHER
NORTHWARD OVER THE MISSISSIPPI VALLEY, RAIN/FREEZING RAIN WILL
DEVELOP OVER PARTS OF THE MIDDLE MISSISSIPPI VALLEY. SLIGHTLY
FARTHER NORTH, LIGHT SNOW WILL DEVELOP OVER PARTS OF THE UPPER
MISSISSIPPI VALLEY ON SATURDAY.
FURTHERMORE, ON THURSDAY EVENING, COLD HIGH PRESSURE OVER THE
UPPER MISSISSIPPI VALLEY WILL MOVE EASTWARD TO THE NORTHEAST BY
SATURDAY. MOREOVER, COLD AIR ASSOCIATED WITH THE HIGH WILL BRING
TEMPERATURES 10 TO 20 DEGREES BELOW AVERAGE OVER PARTS OF THE
UPPER MIDWEST. UPPER-LEVEL ENERGY MOVING OVER THE GREAT LAKES
WILL PRODUCE LIGHT TO MODERATE LAKE-EFFECT SNOW DOWNWIND FROM MOST
OF THE GREAT LAKES THURSDAY EVENING INTO FRIDAY. HOWEVER, MODERATE
TO HEAVY LAKE-EFFECT SNOW WILL DEVELOP DOWNWIND FROM LAKE ONTARIO
ON THURSDAY EVENING INTO FRIDAY. BY SATURDAY, MOST OF THE
LAKE-EFFECT SNOW WILL WANE.
ELSEWHERE, EASTERLY FLOW OFF THE ATLANTIC WILL PRODUCE LIGHT RAIN
OVER PARTS OF FLORIDA S EAST COAST, STARTING ON FRIDAY INTO
SATURDAY.
ZIEGENFELDER
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