768
FXUS01 KWBC 060823
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST FRI DEC 06 2024
VALID 12Z FRI DEC 06 2024 - 12Z SUN DEC 08 2024
...MORE LAKE-EFFECT/LAKE-ENHANCED SNOW DOWNWIND FROM LAKES ERIE
AND ONTARIO...
...ARCTIC AIR CURRENTLY ENGULFING MUCH OF THE EASTERN U.S. WILL
GRADUALLY MODERATE OVER THE NEXT COUPLE OF DAYS...
...DRY AND MILDER THAN AVERAGE TEMPERATURES IN THE WESTERN U.S.
WILL SPREAD INTO THE NORTHERN AND CENTRAL U.S. THROUGH THE NEXT
COUPLE OF DAYS...
UNDER AN INTENSE SURGE OF ARCTIC AIR, FRIDAY MORNING WILL BEGIN
WITH THE COLDEST TEMPERATURES SO FAR THIS SEASON ACROSS MUCH OF
THE CENTRAL AND EASTERN U.S. WITH BLUSTERY CONDITIONS AND A
PIERCING WIND CHILL. THE PERSISTENT FLOW OF ARCTIC OVER THE
RELATIVELY WARM WATERS OF THE GREAT LAKES HAS CONTINUED TO BRING
LAKE-EFFECT SNOWS DOWNWIND INTO THE SNOW BELT. BY LATER TODAY
INTO TONIGHT, ANOTHER CLIPPER CURRENTLY FORMING ALONG THE ARCTIC
FRONT WILL SPREAD MORE SNOW ACROSS THE GREAT LAKES FROM NORTHWEST
TO SOUTHEAST. BY SATURDAY, STILL ANOTHER CLIPPER WILL BRING MORE
WIDESPREAD SNOWFALL ACROSS THE UPPER GREAT LAKES, REACHING INTO
THE LOWER LAKES SATURDAY NIGHT. MILDER AIR COULD CHANGE SOME OF
THE SNOW TO RAIN SATURDAY AFTERNOON NEAR THE WEST FRINGE OF THESE
AREAS. AS MUCH AS TWO ADDITIONAL FEET OF NEW SNOW IS POSSIBLE
NEAR THE EASTERN SHORE OF LAKE ONTARIO THROUGH THE NEXT COUPLE OF
DAYS. LIGHTER SNOWFALL AMOUNTS CAN BE EXPECTED ELSEWHERE ALONG
THE SNOW BELT.
AFTER A MORNING WITH WIND CHILLS POSSIBLY FALLING BELOW ZERO
ACROSS THE MOUNTAINS OF THE APPLACHAINS, CONDITIONS ARE EXPECTED
TO IMPROVE THROUGH THE NEXT COUPLE OF DAYS AS SOUTHWESTERLY WINDS
BEGIN TO BRING MILDER AIR FROM THE WESTERN U.S. INTO THE NORTHERN
AND CENTRAL PLAINS. THE MOST DRASTIC RECOVERY WILL BE FOUND OVER
THE NORTHERN HIGH PLAINS WHERE HIGH TEMPERATURES COULD TOP 60
DEGREES BY SATURDAY AFTERNOON.
THE RETREATING ARCTIC HIGH PRESSURE SYSTEM THAT BRINGS THE MILDER
AIR INTO THE NORTHERN U.S. WILL ALSO BRING INCREASING MOISTURE
INTO TEXAS. IT APPEARS THAT RAIN WILL EXPAND IN COVERAGE ACROSS
SOUTHERN TO EASTERN TEXAS THROUGH SATURDAY AHEAD OF AN UPPER
TROUGH. ADDITIONAL INFLUX OF MOISTURE FROM THE GULF OF MEXICO
COULD BEGIN TO RAISE THE THREAT OF HEAVY RAIN FROM EASTERN TEXAS
INTO LOUISIANA BY EARLY ON SUNDAY.
AFTER A TRANQUIL FRIDAY, INCREASINGLY UNSETTLED WEATHER IS
EXPECTED FOR THE PACIFIC NORTHWEST BY THE WEEKEND. RAIN SHOWERS
AND SOME HIGH ELEVATION SNOW WILL RETURN TO WASHINGTON STATE AND
OREGON BY SATURADAY AS THE NEXT FRONT MOVES THROUGH. THE MOUNTAIN
SNOW AND LOW-ELEVATION RAIN WILL PROGRESS FARTHER INLAND, REACHING
INTO THE NORTHERN ROCKIES BY EARLY SUNDAY AS A LOW PRESSURE SYSTEM
BEGINS TO DEVELOP ACROSS THE NORTHERN HIGH PLAINS INTO ALBERTA
PROVINCE OF CANADA. MUCH OF THE REMAINDER OF THE WESTERN U.S.
WILL REMAIN DRY AND MILDER THAN NORMAL AS HIGH PRESSURE DOMINATES
THE REGION. HIGH TEMPERATURES WILL BE IN THE 80S ACROSS THE
SOUTHWEST WHILE 70S AND 60S WILL PREVAIL FROM SOUTHERN CALIFORNIA
TO THE PACIFIC NORTHWEST.
WILDER
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