459
FOUS11 KWBC 171830
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
230 PM EDT TUE MAR 17 2026
VALID 00Z WED MAR 18 2026 - 00Z SAT MAR 21 2026
..UPPER MIDWEST TO THE NORTHEAST
THE CONUS CONTINUES TO ENTER A NOTABLY MORE TRANQUIL PATTERN
REGARDING HEAVY SNOW FOLLOWING THE DEPARTURE OF THE HISTORIC MID-
MARCH BLIZZARD. WIDESPREAD HEAVY SNOW (ACCUMULATIONS GREATER THAN 4
INCHES) IS NOT EXPECTED ACROSS THE LOWER 48 THROUGH LATE FRIDAY.
HOWEVER, THE UPPER LEVEL PATTERN IS FORECAST TO REMAIN AMPLIFIED,
WITH A STRONG RIDGE ANCHORED OVER THE WESTERN U.S., WHILE A BROAD
TROUGH REMAINS CENTERED OVER THE EAST. AN AMPLIFIED SHORTWAVE
CURRENTLY MOVING THROUGH THE BASE OF THIS EASTERN TROUGH WILL LIFT
OUT TODAY, BUT THE OVERALL PATTERN WILL PERSIST THROUGH THE END OF
THE WEEK.
TONIGHT INTO WEDNESDAY, A LOW-AMPLITUDE SHORTWAVE SLIDING THROUGH
THE NORTHERN NORTHERN TIER WILL TRIGGER A ROUND OF WARM ADVECTION
PRECIPITATION. EXPECT A SWATH OF LIGHT SNOW, WITH SOME FREEZING
RAIN IN SPOTS, TO DEVELOP FROM THE UPPER MISSISSIPPI VALLEY TO THE
WESTERN GREAT LAKES. WPC PROBABILITIES INDICATE MINOR IMPACTS FOR
MOST AREAS, WITH SNOW TOTALS CAPPED AT 1-2 INCHES.
FURTHER DOWNSTREAM, LAKE EFFECT SNOWS WILL PERSIST IN THE LEE OF
LAKE ONTARIO, WITH SEVERAL MORE INCHES POSSIBLE ALONG A NARROW
BAND SOUTHEAST OF THE LAKE BEFORE WINDS BACK TO THE SOUTH TOMORROW.
A MORE AMPLIFIED SHORTWAVE IS FORECAST TO DIVE INTO THE NORTHERN
GREAT LAKES ON FRIDAY. HOWEVER, ACCUMULATIONS ARE EXPECTED TO
LIGHT AND LARGELY CONFINED TO NORTHERN MICHIGAN.
THE PROBABILITY FOR SIGNIFICANT ICING ACROSS THE COUNTRY IS LESS
THAN 10%.
PEREIRA
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