724
FXUS01 KWBC 181930
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
229 PM EST THU JAN 18 2024
VALID 00Z FRI JAN 19 2024 - 00Z SUN JAN 21 2024
...NEXT ARCTIC BLAST TO SPREAD ACROSS MUCH OF THE CENTRAL TO
EASTERN U.S....
...ACCUMULATING SNOWS POSSIBLE FROM THE MID-WEST INTO THE MID
ATLANTIC...
..LAKE EFFECT SNOWS INCREASING FRIDAY INTO SATURDAY
...HEAVY PRECIPITATION MOVING INTO MUCH OF CALIFORNIA FOR THE
WEEKEND...
...SIGNIFICANT ICING AND HEAVY SNOWS POSSIBLE FROM THE CASCADES OF
WASHINGTON INTO EASTERN WASHINGTON AND NORTHEAST OREGON...
THE NEXT SURGE OF ARCTIC AIR, CURRENTLY PUSHING ACROSS THE
NORTHERN PLAINS INTO THE UPPER MISSISSIPPI VALLEY THURSDAY
AFTERNOON, WILL CONTINUE TO SURGE SOUTH THROUGH THE REMAINDER OF
THE PLAINS AND THE MISSISSIPPI VALLEY TONIGHT INTO FRIDAY. THIS
COLD AIR WILL THEN SWEEP INTO THE EASTERN U.S. ON SATURDAY. WHILE
NOT AS COLD AS THE PREVIOUS ARCTIC OUTBREAK THAT PRODUCED NUMEROUS
RECORDS ACROSS THE PLAINS AND LOWER MISSISSIPPI VALLEY LAST WEEK,
THIS NEXT SURGE WILL RESULT IN HIGH TEMPERATURES 20 TO 25 DEGREES
BELOW AVERAGE ON FRIDAY ACROSS MUCH OF THE PLAINS AND MISSISSIPPI
VALLEY. THESE 20 TO 25 DEGREE BELOW AVERAGE TEMPERATURES WILL
PERSIST ACROSS MOST OF THE PLAINS AND MISSISSIPPI AGAIN ON
SATURDAY, WHILE ALSO SPREADING EAST INTO THE TENNESSEE AND OHIO
VALLEYS.
AHEAD OF THE ARCTIC SURGE, AN AREA OF LOW PRESSURE MOVING ACROSS
THE OHIO VALLEY, CENTRAL APPALACHIANS AND THE MID-ATLANTIC WILL
PRODUCE A SWATH OF ACCUMULATING SNOWS FROM THE MID-WEST, EAST INTO
THE UPPER OHIO VALLEY, CENTRAL APPALACHIANS AND MID ATLANTIC.
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 TERRAIN REGIONS OF THE CENTRAL APPALACHIANS FROM
EASTERN KENTUCKY/SOUTHWEST VIRGINIA INTO WEST VIRGINIA.
AS THE ARCTIC AIR SPREADS ACROSS THE GREAT LAKES ON FRIDAY AND
SATURDAY, LAKE EFFECT SNOW SHOWERS WILL BE INCREASINGLY WIDESPREAD
DOWNWIND OF THE UPPER LAKES ON FRIDAY AND THE LOWER LAKES BY
SATURDAY. LOCALLY HEAVY SNOWS 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 WEST 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 FRIDAY 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 FROM THURSDAY AFTERNOON INTO FRIDAY AND HEAVY
SNOWS ACROSS THE WASHINGTON CASCADES AS THE NEXT STORM SYSTEM
MOVES OFF THE PACIFIC AND INTO THE PACIFIC NORTHWEST.
ORAVEC
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