THE WEATHER PREDICTION CENTER

COLLEGE PARK, MD


PROBABILISTIC HEAVY SNOW AND ICE DISCUSSION




PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
451 AM EDT TUE APR 24 2018

VALID 12Z TUE APR 24 2018 - 12Z FRI APR 27 2018

DAYS 1 AND 2...

...NORTHERN ROCKIES TO ADJACENT HIGH PLAINS...

LATE SEASON SNOWFALL OVER PARTS OF THE HIGHER TERRAIN IN WESTERN
SOUTH DAKOTA THIS MORNING AS A WELL-DEFINED SHORTWAVE DROPS
SOUTHEAST INTO THE REGION. THE SYSTEM SHOULD THEN LOSE ANY UPSLOPE
FLOW AT THE SAME TIME IT HEADS INTO A WARMER AIRMASS. 

AN ADDITIONAL AREA OF LIGHT SNOW IS POSSIBLE IN THE UPSLOPE
REGIONS OF MOUNTAINS IN NORTHERN/CENTRAL COLORADO ONCE LOW LEVEL
WINDS TURN TO THE NORTH/NORTHEAST AND THE REGION GETS BRUSHED BY
THE SOUTHERN EDGE OF THE SHORTWAVE TROUGH MENTIONED ABOVE. 
INITIALLY THE LOW LEVELS OVER THE PLAINS SHOULD BE TOO DRY TO
SUPPORT MUCH IN THE WAY OF POST FRONTAL ACCUMULATION. 

GENERALLY LIGHT SNOW WILL ALSO BE POSSIBLE OVER PARTS OF MONTANA
AND WYOMING ON WEDNESDAY AS AN UPSTREAM SHORTWAVE APPROACHES THE
REGION.  THE AMOUNT OF MOISTURE AVAILABLE WILL BE LIMITED.

THE PROBABILITY OF ICING GREATER THAN 0.25 INCHES IS LESS THAN 10
PERCENT.

DAY 3...

THE PROBABILITY OF HEAVY SNOW OR ICING GREATER THAN 0.25 INCHES IS
LESS THAN 10 PERCENT.

BANN









Last Updated: 451 AM EDT TUE APR 24 2018