996
FXUS01 KWBC 170722
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
221 AM EST FRI JAN 17 2025
VALID 12Z FRI JAN 17 2025 - 12Z SUN JAN 19 2025
...ARCTIC FRONT BEGINS TO BRING HAZARDOUS COLD TO MUCH OF THE
NATION THIS WEEKEND...
...WINTRY MIX FOR THE MIDWEST/NORTHEAST AND RAIN FOR THE SOUTHEAST
FRIDAY INTO SATURDAY...
...SNOW SHOWERS WITH SOME MODERATE ACCUMULATIONS EXPECTED THROUGH
THE NORTHERN/CENTRAL ROCKIES AND ADJACENT HIGH PLAINS...
A CLIPPER SYSTEM WILL MOVE QUICKLY ACROSS THE NORTHERN PLAINS INTO
THE MIDWEST FRIDAY AND THE NORTHEAST BY SATURDAY, BRINGING A
WINTRY MIX OF RAIN AND SNOW SHOWERS AHEAD OF A SWEEPING COLD
FRONT. PRECIPITATION TOTALS SHOULD REMAIN ON THE LIGHTER SIDE FOR
MOST LOCATIONS THROUGH SATURDAY, WITH ONLY SOME LIGHT SNOW
ACCUMULATIONS EXPECTED FOR SOME OF THE HIGHER ELEVATIONS OF THE
APPALACHIANS. MORE MODERATE TOTALS ARE EXPECTED WHERE POST-FRONTAL
FLOW ACROSS THE GREAT LAKES WILL LEAD TO SOME LAKE-EFFECT SNOW
SHOWERS FOR FAVORABLE DOWNWIND LOCATIONS, ESPECIALLY ALONG THE
UPPER PENINSULA OF MICHIGAN AND EAST OF LAKE ONTARIO. SOME
POTENTIALLY MORE IMPACTFUL SNOW IS BECOMING MORE LIKELY FOR THE
NORTHEAST ON SUNDAY JUST BEYOND THE CURRENT FORECAST PERIOD.
FURTHER SOUTH, MOIST RETURN FLOW FROM THE GULF OF MEXICO WILL LEAD
TO HEAVIER RAIN SHOWERS AHEAD OF THE TRAILING COLD FRONT THROUGH
THE MIDDLE MISSISSIPPI/OHIO VALLEY AND THE SOUTHEAST LATE FRIDAY
AND INTO EARLY SATURDAY. SOME WINTRY PRECIPITATION WILL BE
POSSIBLE FOLLOWING THE FRONTAL PASSAGE FOR THE OHIO/TENNESSEE
VALLEYS ON SATURDAY. SHOWERS AND THUNDERSTORMS WILL CONTINUE AHEAD
OF THE FRONT AS IT PASSES INTO NORTHERN FLORIDA BY SATURDAY
EVENING, WITH MORE POTENT LOCALLY HEAVY DOWNPOURS AND ISOLATED
FLASH FLOODING POSSIBLE.
THIS SWEEPING COLD FRONT WILL BEGIN TO USHER IN A FRIGID ARCTIC
AIRMASS THAT WILL BE ONE OF THE MAIN NATIONAL WEATHER STORIES THIS
WEEKEND AND INTO THE NEXT WEEK. TEMPERATURES WILL PLUNGE BY 30-40
DEGREES SATURDAY AFTER ABOVE AVERAGE CONDITIONS ON FRIDAY.
FORECAST HIGHS SATURDAY RANGE FROM THE SINGLE DIGITS AND TEENS IN
THE NORTHERN PLAINS/UPPER MIDWEST, THE TEENS AND 20S FOR THE
CENTRAL PLAINS AND MIDWEST, AND THE 30S AND 40S INTO THE SOUTHERN
PLAINS/NORTHERN TEXAS. WIND CHILLS UPWARDS OF 20-30 DEGREES BELOW
ZERO ARE EXPECTED FOR THE NORTHERN PLAINS. UNFORTUNATELY, THIS IS
ONLY JUST THE TIP OF THE ICEBERG, AS EVEN COLDER TEMPERATURES WILL
EXPAND IN COVERAGE BEYOND THE CURRENT FORECAST PERIOD. CONDITIONS
WILL BE AT OR ABOVE AVERAGE AHEAD OF THE FRONT ALONG THE EAST
COAST AND THE SOUTHEAST THROUGH SATURDAY, WITH HIGHS THE NEXT
COUPLE OF DAYS IN THE 30S AND 40S FOR THE NORTHEAST, THE 40S AND
50S FROM THE OHIO VALLEY EAST THROUGH THE CAROLINAS, AND THE 60S
AND LOW 70S FOR THE SOUTHEAST.
UPSLOPE FLOW FOLLOWING THE PASSAGE OF THE FRONT ALONG THE ROCKIES
WILL LEAD TO SOME SCATTERED SNOW SHOWERS WITH LIGHT TO MODERATE
ACCUMULATIONS FOR THE NORTHERN ROCKIES/HIGH PLAINS FRIDAY AND THE
CENTRAL AND SOUTHERN ROCKIES/HIGH PLAINS FRIDAY INTO SATURDAY.
GUSTY WINDS ARE ALSO EXPECTED ACROSS PORTIONS OF THE PLAINS AND
ALONG THE FRONT RANGE OF THE ROCKIES. THIS MAY LEAD TO SOME
BLOWING SNOW IN THE NORTHERN PLAINS. DRY CONDITIONS ARE EXPECTED
FOR THE GREAT BASIN AND WEST COAST, WITH HIGH TEMPERATURES
GENERALLY AROUND AVERAGE. FORECAST HIGHS RANGE FROM THE 30S AND
40S IN THE GREAT BASIN, THE 40S FOR THE PACIFIC NORTHWEST, THE 50S
AND 60S IN CALIFORNIA, AND THE 60S TO LOW 70S IN THE DESERT
SOUTHWEST.
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