058
FXUS01 KWBC 080830
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST SUN DEC 08 2024
VALID 12Z SUN DEC 08 2024 - 12Z TUE DEC 10 2024
...HEAVY RAIN THREAT EMERGES ACROSS THE DEEP SOUTH LATE SUNDAY
INTO MONDAY...
...PERIODS OF MIXED RAIN AND SNOW LINGER FROM THE GREAT LAKES TO
NORTHERN NEW ENGLAND THROUGH MONDAY NIGHT...
...UNSETTLED AND WINDY WEATHER SPREADING ACROSS THE PACIFIC
NORTHWEST THIS WEEKEND WILL REACH INTO THE NORTHERN PLAINS AS
SNOW/WINTRY MIX BY MONDAY...
...WELL ABOVE AVERAGE TEMPERATURES WILL OVERSPREAD THE CENTRAL AND
EASTERN U.S. AS COLD AIR SURGES INTO THE WESTERN U.S....
A MAJOR REVERSAL OF THE WEATHER PATTERN IS FORECAST TO OCCUR
ACROSS MAINLAND U.S. DURING THE NEXT COUPLE OF DAYS. THE
REMAINING COLD AIR ACROSS THE EASTERN U.S. ORIGINATED FROM THE
RECENT ARCTIC OUTBREAK WILL BE DISPELLED BY AN EASTWARD EXPANDING
MILD AIR MASS FROM THE CENTRAL U.S. MEANWHILE, THE MILD AIR
ACROSS THE WESTERN U.S. IN RECENT DAYS WILL BE DISPELLED BY A
SURGE OF COLD AIR CURRENTLY ADVANCING THROUGH THE NORTHWESTERN
U.S. THE UPPER-LEVEL TROUGH RESPONSIBLE FOR THIS COLD SURGE INTO
THE WESTERN U.S. WILL FIRST SPREAD MIXED RAIN AND SNOW THROUGH THE
NORTHERN ROCKIES TODAY BEHIND A COLD FRONT ALONG WITH WINDY
CONDITIONS. DAYTIME HEATING WILL KEEP THE PRECIPITATION MAINLY IN
THE FORM OF RAIN AS IT MOVES QUICKLY ACROSS THE NORTHERN PLAINS
TODAY. BY TONIGHT, COLDER AIR FROM CANADA IS FORECAST TO FILTER
SOUTH FROM CANADA BEHIND A LOW PRESSURE SYSTEM. THIS WILL BRING
PERIODS OF SNOW INTO THE NORTHERN PLAINS AND AREAS FARTHER WEST TO
THE FOOTHILLS OF THE NORTHERN ROCKIES THROUGH TONIGHT AND IN
MONDAY, ALONG WITH WINDY CONDITIONS. THE HIGHER ELEVATIONS WILL
RECEIVE HIGHER AMOUNTS OF SNOW, WITH THE HIGHEST SNOWFALL LIKELY
NEAR THE NORTHERN SLOPES OF THE BLACK HILLS WHERE MORE THAN A FOOT
OF NEW SNOW IS POSSIBLE. PORTIONS OF THE CENTRAL ROCKIES INTO THE
FRONT RANGE OF COLORADO AND DOWN INTO NORTHEASTERN NEW MEXICO CAN
EXPECT TO RECEIVE A PERIOD OF SNOW FROM THIS SYSTEM THROUGH MONDAY
NIGHT INTO TUESDAY MORNING.
AHEAD OF THE COLD FRONT TRAILING SOUTH FROM THE AFOREMENTIONED LOW
PRESSURE SYSTEM, A JET STREAM SLIDING ACROSS NORTHERN MEXICO WILL
INTERACT WITH A COASTAL FRONT AND A LOW PRESSURE WAVE NEAR THE
WESTERN GULF COAST TO BRING AN INCREASING THREAT OF HEAVY RAIN
FARTHER INLAND ACROSS THE LOWER MISSISSIPPI VALLEY AND THEN INTO
THE DEEP SOUTH THROUGH THE NEXT COUPLE OF DAYS. WARMER AND MORE
UNSTABLE AIR ARRIVING FROM THE GULF WILL HELP TRIGGER HEAVIER
SHOWERS AND THUNDERSTORMS FOR THE EASTERN PORTION OF THESE AREAS.
THE OVERLAPPING ELEMENTS COUPLED WITH SOME RECENT RAINFALL WILL
RESULT IN THE POSSIBILITY OF SCATTERED INSTANCES OF FLASH
FLOODING. THE WEATHER PREDICTION CENTER MAINTAINS A MARGINAL RISK
OF EXCESSIVE RAINFALL ACROSS THE CENTRAL GULF COAST REGION FOR
MONDAY INTO EARLY TUESDAY, WITH A SIGHT RISK AREA FROM
SOUTHEASTERN LOUISIANA TO SOUTHERN MISSISSIPPI.
ACROSS NEW ENGLAND, WIDESPREAD SNOWFALL IS IN PROGRESS TODAY AHEAD
OF A CLIPPER SYSTEM MOVING QUICKLY EASTWARD ALONG A WARM FRONT
LIFTING NORTH ACROSS THE REGION. WIDESPREAD SNOWFALL OF UP TO 6
INCHES CAN BE EXPECTED FROM THE ADIRONDACKS EASTWARD THROUGH MAINE
BEFORE THE SNOW TAPERS OFF TONIGHT. MORE SNOW WILL THEN SKIRT THE
UPPER GREAT LAKES AHEAD OF THE WARM FRONT ASSOCIATED WITH THE
NORTHERN PLAINS LOW PRESSURE SYSTEM, WITH 6-8 INCHES EXPECTED OVER
THE UPPER PENINSULA OF MICHIGAN AND THE ARROWHEAD OF MINNESOTA. A
PERIOD OF RAIN WILL SWEEP ACROSS THE OHIO VALLEY SUNDAY NIGHT,
THEN THE APPALACHIANS AND THE NORTHERN MID-ATLANTIC ON MONDAY
AHEAD OF THE TRAILING FRONT, FOLLOWED BY THE NEXT ROUND OF SNOW
ACROSS NORTHERN NEW ENGLAND MONDAY NIGHT. MILD ATLANTIC AIR WILL
KEEP THE PRECIPITATION AS RAIN FOR SOUTHERN NEW ENGLAND INTO
TUESDAY MORNING.
KONG
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