466
FXUS01 KWBC 190809
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST FRI JAN 19 2024
VALID 12Z FRI JAN 19 2024 - 12Z SUN JAN 21 2024
...ANOTHER ARCTIC AIR INTRUSION SPREADING INTO MUCH OF THE CENTRAL
TO EASTERN U.S....
...HEAVY PRECIPITATION MOVING INTO MUCH OF CALIFORNIA FOR THE
WEEKEND WITH HEAVY SNOW ALONG THE SIERRA NEVADA...
...SIGNIFICANT ICING POSSIBLE TODAY AND EARLY SUNDAY THROUGH THE
COLUMBIA RIVER GORGE IN THE PACIFIC NORTHWEST...
...ACCUMULATING SNOWS SPREADING FROM THE MIDWEST INTO THE
MID-ATLANTIC...
..LAKE-EFFECT SNOWS REMAIN ACTIVE INTO SATURDAY
ANOTHER SURGE OF ARCTIC AIR IS CURRENTLY IN PROGRESS ACROSS THE
MID-SECTION OF THE COUNTRY AND THEN OVERSPREAD THE ENTIRE EASTERN
U.S. BY THIS WEEKEND. WHILE NOT AS COLD AS THE PREVIOUS ARCTIC
OUTBREAK THAT PRODUCED NUMEROUS RECORDS ACROSS THE PLAINS AND
LOWER MISSISSIPPI VALLEY LAST WEEK, THIS LATEST ARCTIC BLAST WILL
RESULT IN SUB-ZERO TEMPERATURES AS FAR SOUTH AS MISSOURI AND
KANSAS BY SATURDAY MORNING, WHILE WIND CHILL TEMPERATURES AS LOW
AS -20 TO -30 WILL BE COMMON THROUGH SUNDAY MORNING.
AHEAD OF THE ARCTIC SURGE, WIDESPREAD LIGHT SNOW ASSOCIATED WITH
AN ALBERTA CLIPPER HAS ALREADY OVERSPREAD THE MIDWEST, OHIO
VALLEY, AND INTO THE CENTRAL APPALACHIANS EARLY THIS FRIDAY
MORNING. MEANWHILE, A LOW PRESSURE SYSTEM IS BEGINNING TO FORM
JUST OFF THE COAST OF THE SOUTHEASTERN U.S. THIS SYSTEM IS
FORECAST TO INTENSIFY RAPIDLY AS IT RACES OFF THE EAST COAST
TONIGHT. THE SPEED OF THE EAST COAST LOW WILL NOT ALLOW MUCH
CHANCE FOR THE ALBERTA CLIPPER TO TAP INTO ITS ENERGY SOURCE.
NEVERTHELESS, WIDESPREAD ACCUMULATING SNOWS ASSOCIATED WITH THE
CLIPPER ARE EXPECTED TO QUICKLY MOVE INTO THE MID-ATLANTIC AND
SOUTHERN NEW ENGLAND COASTAL SECTION TODAY AND INTO THIS EVENING
AS THE SNOW TAPERS OFF ACROSS THE OHIO VALLEY. SNOWFALL TOTALS
ARE EXPECTED TO BE IN THE LIGHT TO MODERATE RANGE, GENERALLY 2 TO
4 INCHES, WITH SOME LOCALLY HEAVIER TOTALS OVER 6 INCHES IN THE
WIND-FACING SLOPES OF THE CENTRAL APPALACHIANS FROM EASTERN
KENTUCKY/SOUTHWEST VIRGINIA INTO WEST VIRGINIA. PORTIONS OF THE
NORTHERN MID-ATLANTIC ARE FORECAST TO RECEIVE AMOUNTS IN THE 4 TO
6 INCHES RANGE WHILE THE VICINITY OF CAPE COD MAY ALSO RECEIVE
HIGHER AMOUNTS DUE TO POSSIBLE ENHANCING EFFECTS FROM THE OCEAN
WATERS.
AS THE ARCTIC AIR MOVES OVER THE GREAT LAKES, LAKE EFFECT SNOW
SHOWERS WILL BE INCREASINGLY WIDESPREAD DOWNWIND OF THE UPPER
LAKES TODAY, AND THEN INTO THE LOWER GREAT LAKES BY SATURDAY.
LOCALLY HEAVY SNOWS ARE LIKELY ACROSS PORTIONS OF THE UPPER
PENINSULA OF MICHIGAN, THE WESTERN PORTIONS OF THE LOWER PENINSULA
OF MICHIGAN, ACROSS NORTHWEST INDIANA AND FROM NORTHEAST OHIO,
ACROSS FAR NORTHWEST PENNSYLVANIA INTO PORTIONS OF WESTERN NEW
YORK STATE.
WHILE THE CENTRAL TO EASTERN U.S. WILL BE ENTRENCHED IN MUCH BELOW
AVERAGE ARCTIC AIR, MUCH OF THE WESTERN U.S. FROM THE ROCKIES TO
THE WEST COAST WILL SEE ABOVE AVERAGE TEMPERATURES OVER THE NEXT
FEW DAYS. IN ADDITION, THE NEXT IN THE RECENT SERIES OF STORMS TO
MOVE OFF THE PACIFIC WILL BRING HEAVY PRECIPITATION INTO LARGE
PORTIONS OF CALIFORNIA BEGINNING THIS AFTERNOON AND CONTINUING
THROUGH THE WEEKEND AND INTO EARLY NEXT WEEK.
THE EXCEPTION TO ABOVE AVERAGE TEMPERATURES ACROSS THE WEST WILL
BE OVER THE INTERIOR PACIFIC NORTHWEST FROM NORTH CENTRAL TO
NORTHEAST OREGON INTO WASHINGTON STATE TO THE EAST OF THE
CASCADES. THE WESTERN EXTENT OF THE ARCTIC AIR OVER THE NORTHERN
PLAINS WILL REMAIN IN PLACE ACROSS THESE REGIONS. THIS WILL
SUPPORT POTENTIAL FOR VERY DANGEROUS ICING CONDITIONS THROUGH THE
COLUMBIA RIVER GORGE TODAY BEFORE A LULL EXPECTED TO SET IN THIS
EVENING. HOWEVER, THE NEXT SURGE OF MOISTURE FROM THE NEXT
PACIFIC SYSTEM WILL LIKELY OVERSPREAD NORTHERN CALIFORNIA WITH
HEAVY RAIN FRIDAY NIGHT INTO SATURDAY. HEAVY SNOW WILL THEN REACH
THE SIERRA NEVADA SATURDAY NIGHT. SCATTERED MIXED PRECIPITATION
WILL PENETRATE FARTHER INLAND INTO THE INTERMOUNTAIN REGION BY
SUNDAY MORNING AS MORE FREEZING RAIN COULD IMPACT THE COLUMBIA
RIVER GORGE ONCE AGAIN.
KONG/ORAVEC
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