650
FXUS01 KWBC 270741
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
240 AM EST MON NOV 27 2023
VALID 12Z MON NOV 27 2023 - 12Z WED NOV 29 2023
...HEAVY LAKE-EFFECT SNOWFALL DOWNWIND OF THE GREAT LAKES EARLY
THIS WEEK...
...BELOW AVERAGE TEMPERATURES CONTINUE FOR MUCH OF THE COUNTRY FOR
AT LEAST THE NEXT FEW DAYS...
MEAN NORTHWESTERLY CYCLONIC FLOW OVER THE GREAT LAKES AS LOW
PRESSURE PIVOTS THROUGH THE REGION WILL CONTINUE TO BRING
LAKE-EFFECT SNOWS TO FAVORABLE LOCATIONS SOUTH OF LAKE SUPERIOR
AND EAST OF LAKE MICHIGAN MONDAY. THE HEAVIEST ADDITIONAL SNOWFALL
WILL BE SOUTH OF LAKE SUPERIOR IN THE UPPER PENINSULA OF MICHIGAN,
WITH 4-6", LOCALLY HIGHER, EXPECTED. ANOTHER 2-4" WILL BE POSSIBLE
EAST OF LAKE MICHIGAN OVER THE WESTERN LOWER PENINSULA OF
MICHIGAN. THE FOCUS THEN SHIFTS EASTWARD LATER MONDAY AND INTO
TUESDAY AS VERY HEAVY BANDS OF LAKE-EFFECT SNOW ARE FORECAST
DOWNWIND/EAST OF LAKE ERIE AND LAKE ONTARIO. TOTALS OF 12-18" ARE
FORECAST IN THE HEAVIER SNOW BANDS, WITH LOCALLY HIGHER TOTALS
OVER 2 FEET POSSIBLE. OTHERWISE, THE REST OF THE COUNTRY WILL BE
MOSTLY DRY OUTSIDE OF SOME LINGERING SHOWERS FOR COASTAL MAINE
MONDAY AS LOW PRESSURE DEPARTS TO THE NORTHEAST. SOME LIGHT SNOW
ACCUMULATIONS WILL ALSO CONTINUE FURTHER NORTHWARD INTO MAINE. A
PACIFIC SYSTEM MOVING TOWARDS THE NORTHERN/CENTRAL CALIFORNIA
COAST MAY BRING SOME SHOWERS BY LATER TUESDAY.
THE OTHER MAIN STORY WEATHER-WISE WILL BE CONTINUED HIGH
TEMPERATURES RUNNING 10-20 DEGREES BELOW AVERAGE FOR MUCH OF THE
COUNTRY FOLLOWING A SERIES OF FRONTAL PASSAGES AND BROAD UPPER
TROUGHING IN PLACE OVER THE EASTERN/CENTRAL U.S. HIGHS ALONG THE
EAST COAST MONDAY WILL BE A BIT MORE MODERATE THAN THIS WEEKEND
BEFORE A COLD FRONT BRINGS CHILLIER TEMPERATURES TUESDAY. HIGHS
TUESDAY WILL BE IN THE 30S AND 40S FOR NEW ENGLAND, THE
MID-ATLANTIC, AND EVEN INTO THE CAROLINAS, WITH 50S FOR THE
SOUTHEAST AND GULF COAST/NORTH FLORIDA. CHILLY HIGHS IN THE 20S
AND 30S ARE EXPECTED FOR THE GREAT LAKES/MIDWEST WITH 30S AND 40S
FROM THE CENTRAL PLAINS INTO THE MIDDLE MISSISSIPPI AND OHIO
VALLEYS. HIGHS WILL BE IN THE 50S FOR TEXAS AND THE LOWER
MISSISSIPPI VALLEY.
WHILE TEMPERATURES IN SOME PORTIONS OF THE INTERIOR WEST FROM THE
GREAT BASIN INTO THE CENTRAL ROCKIES WILL REMAIN BELOW AVERAGE,
WITH HIGHS IN THE 30S AND 40S, THE WEST OVERALL WILL SEE MORE
MODERATE TEMPERATURES AS AN UPPER-LEVEL RIDGE PASSES OVER THE
REGION. AREAS IN THE NORTHERN ROCKIES SOUTHWARD THROUGH THE
ADJACENT NORTHERN AND CENTRAL HIGH PLAINS WILL SEE HIGHS INTO THE
40S AND 50S BY TUESDAY. THE PACIFIC NORTHWEST WILL BE IN THE 50S
WITH 60S SOUTHWARD INTO CALIFORNIA AND 70S INTO THE DESERT
SOUTHWEST. HOWEVER, MORNING LOWS NEAR OR BELOW FREEZING WILL
CONTINUE TO REMAIN A CONCERN FOR SENSITIVE VEGETATION IN PORTIONS
OF NORTHERN COASTAL CALIFORNIA AND THE CENTRAL CALIFORNIA VALLEYS.
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