Prognostic Meteorological Discussion
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FXUS01 KWBC 230841
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
441 AM EDT WED APR 23 2014

VALID 12Z WED APR 23 2014 - 12Z FRI APR 25 2014

...A SPRING SNOWSTORM IS EXPECTED TO AFFECT AREAS OF THE UPPER
MIDWEST/GREAT LAKES...

...SEVERE WEATHER WILL BE POSSIBLE THE NEXT COUPLE OF DAYS ACROSS
THE SOUTHERN/CENTRAL PLAINS AND INTO THE ARKLATEX...

...UNSETTLED CONDITIONS TO PERSIST OVER NORTHERN NEW ENGLAND...

AN ACTIVE PERIOD OF WEATHER IS EXPECTED THIS WEEK AS THE UPPER
PATTERN IS OF HIGH AMPLITUDE WITH DYNAMIC SYSTEMS CROSSING THE
COUNTRY. TO BEGIN THE FORECAST, A RIDGE IS CENTERED IN THE MIDDLE
OF THE NATION WHILE UPPER TROUGHS ARE FEATURED ON EITHER SIDE. THE
BROAD TROUGH TRACKING THROUGH THE WESTERN U.S. HAS BEEN
RESPONSIBLE FOR HIGH ELEVATION SNOWS ACROSS THE INTERMOUNTAIN WEST
EARLY THIS MORNING. AS THE SYSTEM CONTINUES TO MARCH EASTWARD IT
WILL BEGIN TO ENCOUNTER A MARKED INCREASE IN MOISTURE CONTENT
WHICH SHOULD SPREAD VAST AMOUNTS OF PRECIPITATION ALONG AND AHEAD
OF THE COLD FRONT. NOT ALL OF THE PRECIPITATION WILL BE OF THE
LIQUID VARIETY AS A SPRING SNOWSTORM IS FORECAST OVER NORTHEASTERN
MINNESOTA EASTWARD INTO EXTREME NORTHERN WISCONSIN AND THE UPPER
PENINSULA OF MICHIGAN. THE WPC WINTER WEATHER DESK SUGGESTS
AMOUNTS MAY APPROACH THE 8 TO 12 INCH RANGE GIVEN THE ANOMALOUS
MOISTURE THIS SYSTEM WILL FEED OFF OF. WHILE IT WILL FEEL LIKE
WINTER ACROSS THE NORTHERN TIER OF THE COUNTRY, IT SHOULD
DEFINITELY BE MORE SPRING-LIKE OVER THE SOUTHERN/CENTRAL PLAINS
WHERE SEVERE WEATHER IS LIKELY TODAY. STRONG VERTICAL LIFT ALONG
THE APPROACHING FRONT COUPLED WITH SUFFICIENT INSTABILITY AND
MOISTURE WILL AID IN THE DEVELOPMENT OF THUNDERSTORMS,
PARTICULARLY IN THE VICINITY OF THE COLD FRONT AND DRYLINE. IT
APPEARS THE BIGGEST THREAT IS LARGE HAIL ALTHOUGH LOW-LEVEL WIND
PROFILES APPEAR FAVORABLE FOR A FEW TORNADOES. FOR MORE
INFORMATION RELATED TO THE SEVERE WEATHER ASPECT OF THIS STORM,
PLEASE VISIT THE STORM PREDICTION CENTER WEBSITE AT
WWW.SPC.NOAA.GOV.

WHILE ONE POWERFUL SYSTEM AFFECTS THE CENTRAL U.S., ANOTHER UPPER
TROUGH RELOADS ACROSS THE WEST COAST MAINTAINING UNSETTLED WEATHER
THROUGHOUT THE REMAINDER OF THE WORK WEEK. PERIODS OF ONSHORE FLOW
WITH THE APPROACH OF EACH INDIVIDUAL IMPULSE WILL HELP SPREAD AN
EXPANSIVE AREA OF PRECIPITATION TO THE PACIFIC NORTHWEST AND UPPER
INTERMOUNTAIN WEST. THE USUAL UPSLOPE EFFECTS SHOULD AUGMENT
AMOUNTS ACROSS THE FAVORED TERRAIN WITH SNOW BEING ELEVATION
DEPENDENT. THE HIGHEST FORECAST AMOUNTS ARE OVER THE BITTERROOTS
WHERE UP TO A FOOT WILL BE POSSIBLE THROUGH FRIDAY MORNING.
ELSEWHERE, A DEVELOPING CLOSED LOW OFF THE NEW ENGLAND COAST WILL
KEEP COOL AND DAMP CONDITIONS IN PLACE DURING THE NEXT COUPLE OF
DAYS. THE SURFACE LOW STRENGTHENING OFFSHORE WILL HELP ENHANCE THE
MOISTURE TRANSPORT TOWARD THE COASTLINE. SURFACE TEMPERATURES
APPEAR TO BE COLD ENOUGH ACROSS INTERIOR MAINE TO SUPPORT LIGHT
SNOWFALL ACCUMULATIONS WHILE A COLD RAIN WILL BE COMMONPLACE
ELSEWHERE.


RUBIN-OSTER


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