389
FXUS01 KWBC 021930
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
230 PM EST THU JAN 02 2025
VALID 00Z FRI JAN 03 2025 - 00Z SUN JAN 05 2025
...LONG DURATION LAKE-EFFECT SNOW EVENT CONTINUES DOWNWIND OF THE
GREAT LAKES...
...PACIFIC SYSTEM BRINGS ANOTHER ROUND OF LOCALLY HEAVY COASTAL
RAINS AND HIGHER ELEVATION SNOW TO THE NORTHWESTERN U.S./ROCKIES
FRIDAY INTO SATURDAY....
...ARCTIC AIR SURGES SOUTH FROM THE NORTHERN PLAINS THROUGH THE
CENTRAL AND EASTERN U.S....
STRONG NORTHWESTERLY WINDS ON THE SOUTHWEST SIDE OF A LOW PRESSURE
SYSTEM LINGERING OVER SOUTHEASTERN CANADA WILL LEAD TO CONTINUED
LAKE-EFFECT SNOW BANDS DOWNWIND OF THE GREAT LAKES THROUGH THE END
OF THIS WEEK AND INTO THE WEEKEND. THE HEAVIEST SNOW IS EXPECTED
DOWNWIND OF LAKES ONTARIO AND ERIE, WHERE TOTAL SNOWFALL AMOUNTS
IN THE 2-4 FEET RANGE WILL BE POSSIBLE UNDER THE MOST PERSISTENT
BANDS. SOME MODERATE TO LOCALLY HEAVY SNOWFALL WILL BE POSSIBLE
DOWNWIND OF LAKES SUPERIOR AND MICHIGAN AS WELL, THOUGH THIS
SHOULD TAPER OFF BY SATURDAY. AN UPPER-LEVEL SHORTWAVE AND
ACCOMPANYING COLD FRONT SWEEPING THROUGH THE MIDWEST WILL ALSO
BRING SOME LIGHT WINTRY PRECIPITATION CHANCES THROUGH FRIDAY
MORNING BEFORE SOME MUCH MORE SUBSTANTIAL ACCUMULATING SNOWFALL IN
THE CENTRAL APPALACHIANS INTO THE DAY FRIDAY. WINTER
WEATHER-RELATED ADVISORIES HAVE BEEN ISSUED FOR SNOW TOTALS OF
6-12 INCHES. SNOW SHOULD TAPER OFF BY SATURDAY MORNING.
IN THE WEST, ONGOING COASTAL RAIN, A LOWER ELEVATION RAIN/SNOW
MIX, AND HIGHER ELEVATION SNOW WILL BEGIN TO RAMP BACK UP INTO
THURSDAY EVENING AND OVERNIGHT AS YET ANOTHER UPPER-LEVEL
WAVE/PACIFIC SYSTEM MOVE INTO THE PACIFIC NORTHWEST BRINGING
ADDITIONAL MOISTURE FROM THE PACIFIC TO THE COAST AND INLAND.
LOCALLY HEAVY RAINFALL IS MOST LIKELY THROUGH FRIDAY FOR UPSLOPE
REGIONS ALONG THE COASTAL RANGES OF SOUTHWESTERN OREGON AND
NORTHERN CALIFORNIA AS WELL AS INLAND ALONG THE SIERRA IN NORTHERN
CALIFORNIA. SOME ISOLATED INSTANCES OF FLOODING WILL BE POSSIBLE.
HEAVY, ACCUMULATING SNOWFALL IS EXPECTED IN THE CASCADES AND
SIERRA AS WELL AS THE NORTHERN ROCKIES FRIDAY, SPREADING INTO THE
CENTRAL ROCKIES BY SATURDAY AS THE SYSTEM CONTINUES INLAND.
SNOWFALL TOTALS OVER A FOOT ARE LIKELY FOR THE HIGHER MOUNTAIN
PEAKS. A MIX OF LIGHT TO MODERATE RAIN AND SOME SNOW WILL PASS
INLAND THROUGH THE GREAT BASIN FRIDAY AND FRIDAY NIGHT, WITH
LITTLE TO NO ACCUMULATIONS EXPECTED. MOIST, UPSLOPE FLOW AHEAD OF
THE SYSTEM AS IT PASSES OVER THE ROCKIES WILL BRING SOME HEAVY,
ACCUMULATING SNOWFALL TO THE NORTHERN HIGH PLAINS AS WELL
BEGINNING FRIDAY AFTERNOON AND CONTINUING INTO THE DAY SATURDAY.
THIS SYSTEM WILL LEAD TO IMPACTFUL WINTER WEATHER FROM THE CENTRAL
PLAINS EASTWARD THROUGH THE MIDDLE MISSISSIPPI/OHIO VALLEYS AND
EVENTUALLY THE MID-ATLANTIC MOSTLY AFTER THE CURRENT FORECAST
PERIOD SATURDAY EVENING, THOUGH SOME WINTRY PRECIPITATION MAY
BEGIN FOR THE CENTRAL PLAINS BY LATE SATURDAY AFTERNOON.
A STAGNANT PATTERN FEATURING A STRONG UPPER-LEVEL LOW OVER
SOUTHEASTERN CANADA/THE NORTHEASTERN U.S. WILL BEGIN TO SETTLE IN
LATE THIS WEEK AND LAST WELL BEYOND THE CURRENT FORECAST PERIOD,
BRINGING A STRETCH OF BELOW AVERAGE, CHILLY WINTER TEMPERATURES TO
MUCH OF THE CENTRAL AND EASTERN U.S. THESE CONDITIONS ARE ALREADY
SPREADING THROUGH THE NORTHERN PLAINS AND MIDWEST, WITH FORECAST
HIGHS FRIDAY IN THE SINGLE DIGITS AND TEENS IN THE NORTHERN PLAINS
AND THE TEENS TO 20S IN THE MIDWEST. GUSTY WINDS WILL BRING WIND
CHILLS AS LOW AS -30 DEGREES FOR PORTIONS OF THE NORTHERN PLAINS
FRIDAY MORNING. THE SURGE OF COLDER AIR WILL REACH THE EAST COAST
BY SATURDAY WITH HIGHS IN THE TEENS AND 20S FOR NEW ENGLAND, THE
20S AND 30S IN THE MID-ATLANTIC, THE 30S AND 40S IN THE CAROLINAS,
AND THE 40S AND 50S IN THE SOUTHEAST. HIGHS IN FLORIDA WILL BE IN
THE 50S AND 60S OUTSIDE OF SOUTH FLORIDA, AND FREEZE AND
FROST-RELATED ADVISORIES ARE IN EFFECT FOR THE NORTHERN PENINSULA
AS LOWS DROPPING INTO THE LOW 30S COULD DAMAGE LOCAL VEGETATION.
IN STARK CONTRAST, CONDITIONS OVER THE WESTERN AND SOUTH-CENTRAL
U.S. WILL BE ABOVE AVERAGE AND MILD FOR MOST LOCATIONS, WITH 40S
AND 50S FOR THE PACIFIC NORTHWEST AND INTERIOR WEST, 50S AND 60S
FOR CALIFORNIA AND THE SOUTHERN ROCKIES/PLAINS, AND 60S AND 70S IN
THE SOUTHWEST.
PUTNAM
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page