454
FXUS01 KWBC 201950
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
250 PM EST SAT JAN 20 2024
VALID 00Z SUN JAN 21 2024 - 00Z TUE JAN 23 2024
...HEAVY SNOW FOR THE SIERRA NEVADA MOUNTAINS AND HIGHER ELEVATION
SNOW ACROSS THE WEST; LAKE-EFFECT SNOW DOWNWIND FROM THE GREAT
LAKES AND UPSLOPE SNOW FOR THE CENTRAL APPALACHIANS ON SUNDAY...
...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF
NORTHERN CALIFORNIA, SOUTHERN CALIFORNIA, AND OVER THE WESTERN
GULF COAST/LOWER MISSISSIPPI VALLEY...
...RAIN/FREEZING RAIN OVER PARTS OF THE PACIFIC NORTHWEST AND THE
NORTHERN HIGH PLAINS AND HEAVY RAIN/FREEZING RAIN OVER PARTS OF
THE SOUTHERN PLAINS, LOWER/MIDDLE MISSISSIPPI VALLEY...
HIGH PRESSURE OVER THE MIDDLE MISSISSIPPI VALLEY WILL SLOWLY MOVE
EASTWARD TO THE MID-ATLANTIC COAST BY MONDAY EVENING. COLD AIR
ASSOCIATED WITH THE HIGH WILL CREATE TEMPERATURES 20 TO 30 DEGREES
BELOW AVERAGE FROM THE CENTRAL/SOUTHERN PLAINS, MIDDLE MISSISSIPPI
VALLEY, AND OHIO/TENNESSEE VALLEYS. UPPER-LEVEL ENERGY OVER THE
GREAT LAKES, OHIO VALLEY, AND MID-ATLANTIC WILL PRODUCE
LAKE-EFFECT SNOW DOWNWIND FROM THE GREAT LAKES THROUGH SUNDAY
EVENING. THERE WILL ALSO BE UPSLOPE SNOW OVER PARTS OF THE CENTRAL
APPALACHIANS AND THE NORTHEAST.
MULTIPLE FRONTS WILL MOVE ONSHORE OVER THE WEST AND DISSIPATE OVER
THE NEXT FEW DAYS. THE SYSTEMS WILL PRODUCE HEAVY SNOW OVER THE
SIERRA NEVADA MOUNTAINS AND THE HIGHEST-ELEVATION SNOW OVER THE
WEST, EXTENDING INTO THE HIGHER ELEVATIONS OF THE SOUTHWEST. IN
ADDITION, A PLUME OF MOISTURE WILL MOVE OVER PARTS OF NORTHERN
CALIFORNIA, PRODUCING HEAVY RAIN FROM SATURDAY INTO MONDAY.
THEREFORE, THE WPC HAS ISSUED A SLIGHT RISK OF EXCESSIVE RAINFALL
OVER PARTS OF NORTHERN CALIFORNIA INTO SUNDAY MORNING. THE
ASSOCIATED HEAVY RAIN WILL CREATE MAINLY LOCALIZED AREAS OF FLASH
FLOODING, WITH URBAN AREAS, ROADS, SMALL STREAMS, NARROW
CANYONS/GULLIES, AND BURN SCARS THE MOST VULNERABLE.
MOREOVER, ON SUNDAY, THE THREAT OF EXCESSIVE RAINFALL CONTINUES
OVER NORTHERN CALIFORNIA. THEREFORE, THE WPC HAS ISSUED A SLIGHT
RISK OF EXCESSIVE RAINFALL OVER PARTS OF NORTHERN CALIFORNIA FROM
SUNDAY INTO MONDAY MORNING. THE ASSOCIATED HEAVY RAIN WILL CREATE
MAINLY LOCALIZED AREAS OF FLASH FLOODING, WITH URBAN AREAS, ROADS,
SMALL STREAMS, NARROW CANYONS/GULLIES, AND BURN SCARS THE MOST
VULNERABLE.
ON MONDAY, THE PLUME OF MOISTURE WILL STREAM INTO SOUTHERN
CALIFORNIA, PRODUCING HEAVY RAIN. THEREFORE, THE WPC HAS ISSUED A
SLIGHT RISK OF EXCESSIVE RAINFALL OVER PARTS OF SOUTHERN
CALIFORNIA ON MONDAY. THE ASSOCIATED HEAVY RAIN WILL CREATE MAINLY
LOCALIZED AREAS OF FLASH FLOODING, WITH URBAN AREAS, ROADS, SMALL
STREAMS, NARROW CANYONS/GULLIES, AND BURN SCARS THE MOST
VULNERABLE.
FURTHERMORE, WARMER AIR ASSOCIATED WITH THE PLUME OF MOISTURE WILL
CONTRIBUTE TO RAIN/FREEZING RAIN OVER PARTS OF THE PACIFIC
NORTHWEST IN THE REGION OF THE COLUMBIA GORGE THROUGH MONDAY. IN
ADDITION, RAIN/FREEZING RAIN WILL DEVELOP OVER PARTS OF THE
NORTHERN PLAINS ON MONDAY.
ELSEWHERE, THE FLOW AROUND THE AREA OF HIGH PRESSURE OVER THE
EASTERN U. S. WILL STREAM MOISTURE NORTHWARD FROM THE WESTERN GULF
OF MEXICO COMBINED WITH UPPER-LEVEL ENERGY, WHICH WILL AID IN
PRODUCING RAIN OVER PARTS OF SOUTHERN TEXAS ON SUNDAY. THE
MOISTURE WILL CONTINUE TO FLOW NORTHWARD OVER THE SOUTHERN PLAINS
AND LOWER MISSISSIPPI VALLEY INTO THE GREAT LAKES ON MONDAY. THE
MOISTURE FLOW WILL ALSO PRODUCE SHOWERS, THUNDERSTORMS, AND HEAVY
RAIN OVER PARTS OF THE WESTERN GULF COAST AND LOWER MISSISSIPPI
VALLEY. THEREFORE, THE WPC HAS ISSUED A SLIGHT RISK OF EXCESSIVE
RAINFALL OVER PARTS OF THE WESTERN GULF COAST AND LOWER
MISSISSIPPI VALLEY ON MONDAY. THE ASSOCIATED HEAVY RAIN WILL
CREATE MAINLY LOCALIZED AREAS OF FLASH FLOODING, WITH URBAN AREAS,
ROADS, AND SMALL STREAMS THE MOST VULNERABLE.
MEANWHILE, THE MOISTURE FLOWS NORTHWARD INTO THE COLD AIR OVER THE
COUNTRY S MIDDLE PART, PRODUCING HEAVY RAIN/FREEZING RAIN OVER
PARTS OF THE SOUTHERN PLAINS, LOWER/MIDDLE MISSISSIPPI VALLEY ON
MONDAY. ADDITIONALLY, LIGHT RAIN/FREEZING RAIN WILL DEVELOP OVER
PARTS OF THE WESTERN OHIO VALLEY INTO THE GREAT LAKES.
ZIEGENFELDER
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