213
FOUS11 KWBC 221900
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 PM EDT WED APR 22 2026
VALID 00Z THU APR 23 2026 - 00Z SUN APR 26 2026
..NORTHERN ROCKIES TO THE HIGH PLAINS
DAYS 1-3...
AS A DEEP MID-TO-UPPER LEVEL LOW MOVES FURTHER INLAND OVER THE
NORTHWESTERN U.S., SNOW WILL CONTINUE TO DIMINISH OVER THE
CASCADES AND SIERRA NEVADA WHILE INTENSIFYING OVER PORTIONS OF THE
NORTHERN ROCKIES OVERNIGHT. LEFT-EXIT REGION UPPER JET FORCING
INTERACTING WITH RESIDUAL MOISTURE WILL INITIALLY HELP TO FOCUS
SOME OF THE HEAVIER ACCUMULATIONS ALONG CENTRAL TO NORTHERN IDAHO,
WESTERN MONTANA, AND WESTERN WYOMING RANGES. AS THE INITIAL LOW
LIFTS NORTH, A WELL-DEFINED SHORTWAVE DIVING SOUTH FROM WESTERN
CANADA WILL PROVIDE REINFORCING ASCENT AND A SHOT OF COLDER AIR
ACROSS THE NORTHERN ROCKIES BEGINNING EARLY TOMORROW. SNOW LEVELS
ARE FORECAST TO DROP STEADILY OVER THE NORTHERN AND CENTRAL ROCKIES
TOMORROW INTO EARLY FRIDAY, DIPPING BELOW 2,000 FT ACROSS NORTHERN
PARTS OF THE REGION. LIGHT TO MODERATE SNOW IS EXPECTED TO
CONTINUE INTO LATE FRIDAY AS THE DEEP, VERTICALLY-STACKED LOW
DRIFTS INTO SOUTH-CENTRAL CANADA.
PROBABILISTIC GUIDANCE INDICATES THE HEAVIEST SNOW TOTALS WILL
FOCUS FROM NORTHERN IDAHO AND WESTERN MONTANA TO THE WESTERN AND
CENTRAL WYOMING RANGES. WPC PROBABILITIES INDICATE ACCUMULATIONS
EXCEEDING INCHES WILL BE LIKELY, ESPECIALLY FOR AREAS ABOVE 6,000
FT, WITH SOME 18+ INCH TOTALS EXPECTED OVER PARTS OF THE HIGHER
TERRAIN. SOME LIGHT ACCUMULATIONS -- LESS THAN 2 INCHES FOR MOST
LOCATIONS -- ARE EXPECTED TO SPREAD OUT INTO THE NORTHEASTERN
MONTANA HIGH PLAINS AND EAST OF THE BIG HORNS TO THE BLACK HILLS.
THE PROBABILITY FOR SIGNIFICANT FREEZING RAIN EXCEEDING 0.1 INCHES
ACROSS THE CONUS IS LESS THAN 10 PERCENT.
PEREIRA
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page