207
FOUS11 KWBC 241818
QPFHSD
PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
218 PM EDT FRI APR 24 2026
VALID 00Z SAT APR 25 2026 - 00Z TUE APR 28 2026
.WESTERN U.S
A 500MB SHORTWAVE TROUGH ROTATING AROUND THE SOUTHERN FLANK OF A
500MB LOW OFF THE CA COAST WILL TRACK ACROSS CENTRAL CALIFORNIA
SATURDAY NIGHT AND REACH THE CENTRAL ROCKIES BY LATE SUNDAY.
HEALTHY PVA OVER THE ROCKIES AND THE LEFT-EXIT REGION OF A 250MB
JET STREAK POSITIONED OVERHEAD WILL FOSTER EXCELLENT UPPER- LEVEL
DIVERGENCE WHILE A HEALTHY SLUG OF 700-300MB MOISTURE ARRIVES FROM
THE SUBTROPICAL PACIFIC. TEMPERATURES ALOFT ARE NOT OVERLY COLD, SO
SNOWFALL WILL BE CONFINED TO THE HIGHER ELEVATIONS OF THE SIERRA
NEVADA ON EAST ACROSS THE INTERMOUNTAIN WEST.
..SIERRA NEVADA
DAY 2...
PRECIP ONSET SATURDAY AFTERNOON FOR THE CENTRAL/SOUTHERN SIERRA
NEVADA AHEAD OF THIS WAVE WHERE SNOW LEVELS INITIALLY AROUND
7500FT DROP TO AROUND 6000FT SATURDAY NIGHT BEFORE PRECIP TAPERS
OFF. DAY 2 SNOW PROBS FOR >6" ARE 40-70% IN THE HIGHER ELEVATIONS
OF THE SIERRA NEVADA SOUTH OF SONORA PASS AND THE WHITE MTNS.
..GREAT BASIN THROUGH CENTRAL/SOUTHERN ROCKIES
DAYS 2/3...
PRECIP QUICKLY EXPANDS FROM CENTRAL NV THROUGH CO SATURDAY NIGHT
LINGERING THROUGH SUNDAY, THEN A SECONDARY TROUGH AXIS MONDAY
BRINGS SOME MORE LIGHT PRECIP TO UT/CO. SNOW LEVELS LINGER AROUND
8000FT IN NV/UT WHILE 9000FT SNOW LEVELS IN CO DROP TO 8000FT
SUNDAY EVENING. DAY 2 SNOW PROBS FOR >6" ARE 50-60% ON THE HIGHEST
CENTRAL NV RANGES, WASATCH, UINTA, AND SOUTHERN UTAH RANGES. DAY
2.5 SNOW PROBS FOR >6" ARE 50-90% IN THE SAN JUANS/ELK RANGES IN CO
AND 40-70% IN THE PARK RANGE IN CO AND WIND RIVER IN WY. AS OF THIS
TIME THE MONDAY SNOW IS ON THE LIGHT SIDE WITH DAY 3.5 PROBS FOR
>4" 40-60% IN THE WASATCH, UINTA AND NORTHERN CO INTO SOUTHERN WY
RANGES.
THE PROBABILITY FOR SIGNIFICANT ICING OVER ONE-TENTH OF AN INCH IS
LESS THAN 10 PERCENT.
JACKSON
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