Prognostic Meteorological Discussion
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FXUS01 KWBC 210800
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
359 AM EDT TUE APR 21 2015

VALID 12Z TUE APR 21 2015 - 12Z THU APR 23 2015

***LARGE LOW PRESSURE SYSTEM OVER THE GREAT LAKES***

***SNOW LIKELY FOR PARTS OF THE UPPER MIDWEST***

***SCATTERED RAIN AND SNOW SHOWERS FOR THE ROCKIES***

A LARGE UPPER LEVEL LOW OVER THE UPPER MIDWEST AND GREAT LAKES AT
THE START OF THE PERIOD WILL BE A KEY PLAYER IN THE WEATHER
EXPECTED FOR THE EASTERN U.S. THROUGH WEDNESDAY.  AN OCCLUDED
SURFACE LOW CURRENTLY OVER ONTARIO IS FORECAST TO REMAIN NEARLY
STATIONARY OVER THE NEXT COUPLE OF DAYS, AND THIS WILL BE CLOSE TO
THE UPPER-LEVEL LOW.

IN TERMS OF SENSIBLE WEATHER IMPACTS, IMPROVING WEATHER IS
EXPECTED FROM THE SOUTHEAST COAST TO NEW ENGLAND AS THE COLD FRONT
EXITS THE COAST AND TAKES THE BAD WEATHER ALONG WITH IT.  ON THE
WEST SIDE OF THE LARGE SURFACE LOW, UNSEASONABLY COLD WEATHER IS
EXPECTED FOR THE UPPER MIDWEST ALONG WITH SOME LATE-SEASON SNOW
SHOWERS.  A SECONDARY COLD FRONT IS PROGGED TO SWEEP THROUGH THE
OHIO VALLEY AND REACH THE EAST COAST BY WEDNESDAY NIGHT, AND A
PROLONGED STRETCH OF COOLER THAN NORMAL TEMPERATURES IS EXPECTED
BEHIND THIS FRONT.

FOR THE WESTERN U.S., EXPECT SOME ISOLATED TO SCATTERED SHOWERS TO
DEVELOP OVER PARTS OF THE ROCKIES AND THE SIERRA NEVADA RANGE EACH
AFTERNOON, WITH SNOW SHOWERS FOR THE HIGHEST ELEVATIONS.

HAMRICK



GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
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