786
FOUS11 KWBC 261900
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 PM EDT SUN APR 26 2026
VALID 00Z MON APR 27 2026 - 00Z THU APR 30 2026
...GREAT BASIN THROUGH CENTRAL/SOUTHERN ROCKIES ONTO THE NORTHERN
PLAINS...
DAYS 1-2...
UPPER LOW OVER CENTRAL SASKATCHEWAN IS BEGINNING TO LIFT NORTHEAST
WHILE AN APPENDANT POSITIVELY-TILTED TROUGH AXIS LINGERS OVER THE
NORTHERN ROCKIES TO FAR NORTHERN CA. A LEADING SHORTWAVE TROUGH
APPROACHING THE CO ROCKIES WILL STRENGTHEN IN LEFT-EXIT JET
DYNAMICS WITH A POTENT LEE-SIDE TROUGH CROSSING THE SOUTH-CENTRAL
PLAINS TONIGHT, REACHING THE GREAT LAKES BY MONDAY EVENING. THE
NORTHERN FRINGE OF THIS LOW PRESSURE SYSTEM WILL PRODUCE SOME SNOW
TONIGHT OVER EASTERN WY INTO MT AND ACROSS ND. LOCALLY MODERATE
TERRAIN BASED SNOW (UP TO 1.5"/HR RATES PER THE 12Z HREF AND REFS)
CONTINUES THROUGH TONIGHT AHEAD OF THE MAIN TROUGH AXIS WITH SNOW
LEVELS OF 8000FT (IN NV/UT) AND 9000FT (IN CO/SOUTHERN WY) DROP
ABOUT A THOUSAND FEET THROUGH THE NIGHT. DAY 1 SNOW PROBS FOR >6"
ARE 40-80% OVER THE CENTRAL NV RIDGES, HIGHER CENTRAL UT RANGES
THROUGH THE WASATCH AND UINTA, WESTERN AND CENTRAL CO ROCKIES,
CENTRAL ID RANGES, AND THE WIND RIVER, ABSAROKA, AND BIGHORNS.
THE MAIN TROUGH AXIS SHIFTS EAST ACROSS THE ROCKIES MONDAY NIGHT
INTO TUESDAY WITH MAINLY LEE-SIDE FORCING AHEAD OF THIS TROUGH AXIS
AIDED BY A 1025MB SURFACE HIGH CENTERED OVER ND. DAY 2 SNOW PROBS
FOR >6" ARE 30-60% FOR THE LARAMIE RANGE IN WY DOWN INTO THE PARK
AND FRONT RANGES IN CO WITH SNOW LEVELS AROUND 7000FT.
THE PROBABILITY FOR SIGNIFICANT ICING OVER ONE-TENTH OF AN INCH IS
LESS THAN 10 PERCENT.
JACKSON
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page