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Prognostic Meteorological Discussion
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FXUS01 KWBC 250838
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
437 AM EDT SAT MAY 25 2013

VALID 12Z SAT MAY 25 2013 - 12Z MON MAY 27 2013

...WET AND UNSEASONABLY COLD WEEKEND FOR THE NORTHEAST...

...SHOWERS AND THUNDERSTORMS WITH LOCALLY HEAVY RAINS FOR PORTIONS
OF THE PLAINS AND MISSISSIPPI VALLEY...

...UNSETTLED WEATHER CONTINUES IN THE PACIFIC NORTHWEST...

A STRONG AREA OF LOW PRESSURE WILL CHURN SLOWLY NORTH ALONG THE
NEW ENGLAND COAST OVER THE NEXT COUPLE OF DAYS, DELIVERING A
PROLONGED PERIOD OF WET WEATHER AND ANOMALOUSLY COLD TEMPERATURES
TO THE NORTHEAST THIS HOLIDAY WEEKEND.  THIS AREA OF LOW PRESSURE,
CENTERED CURRENTLY ALONG THE SOUTHERN NEW ENGLAND COAST, WILL
TRACK SLOWLY TO THE NORTH, NOT REACHING THE CANADIAN MARITIME
PROVINCES UNTIL LATE SUNDAY.  ATLANTIC MOISTURE THROWN AROUND THE
BACKSIDE OF THE SYSTEM WILL FUEL HEAVY PRECIPITATION ACCUMULATIONS
ACROSS PORTIONS OF NORTHERN NEW ENGLAND AND NEW YORK.  SOME OF
THIS PRECIPITATION IS EXPECTED TO FALL IN THE FORM OF SNOW AS COLD
AIR POURS DOWN OUT OF CANADA, POSSIBLY RESULTING IN SIGNIFICANT
ACCUMULATIONS ACROSS SOME OF THE HIGHER PEAKS OF THE ADIRONDACKS,
GREEN AND WHITE MOUNTAINS.  FURTHER TO THE SOUTH, UNSEASONABLY
COOL, BUT DRY CONDITIONS ARE EXPECTED TO HIGHLIGHT THE WEEKEND
ACROSS THE MID ATLANTIC AND SOUTHEAST.

ACROSS THE CENTRAL U.S., BROAD MOIST SOUTHERLY WINDS OUT OF THE
WESTERN GULF OF MEXICO ARE EXPECTED TO ENCOURAGE AT LEAST
SCATTERED SHOWERS AND THUNDERSTORMS, WITH ISOLATED HEAVY HEAVY
RAINS, ACROSS PORTIONS OF TEXAS AND OKLAHOMA BOTH DAYS.  A BETTER
CHANCE FOR MORE ORGANIZED STORMS IS EXPECTED FURTHER TO THE NORTH
ALONG A SLOW MOVING FRONT STRETCHING FROM THE NORTHERN HIGH PLAINS
THROUGH THE MID MISSISSIPPI VALLEY.  IN ADDITION TO THE STORMS
ALREADY FIRING ACROSS NEBRASKA INTO IOWA AND ILLINOIS, GULF
MOISTURE POOLING ALONG THE BOUNDARY INTERACTING WITH A STRING OF
UPPER LEVEL DISTURBANCES EMANATING FROM THE WEST MAY PRODUCE
ADDITIONAL ORGANIZED SHOWERS AND THUNDERSTORMS WITH HEAVY RAINS
LATER TODAY ACROSS PORTIONS OF THE NORTHERN HIGH PLAINS TO THE MID
MISSOURI AND MISSISSIPPI VALLEYS.

COOL AND UNSETTLED WEATHER WILL CONTINUE ACROSS PORTIONS OF THE
PACIFIC NORTHWEST AND THE NORTHERN ROCKIES AS A SERIES OF UPPER
DISTURBANCES MOVE THROUGH A BROAD UPPER TROUGH THAT IS FORECAST TO
REMAIN CENTERED OVER THE WESTERN U.S. THROUGH THE EARLY PART OF
NEXT WEEK.  LOW PRESSURE LIFTING INTO WESTERN CANADA THIS MORNING
WILL BE REPLACED BY ANOTHER SYSTEM NEARING THE OREGON COAST LATER
TONIGHT.  THIS IS EXPECTED TO PRODUCE SOME LIGHT TO MODERATE RAINS
CENTERED ACROSS WESTERN OREGON BEFORE PUSHING INLAND ON SUNDAY
WHILE YET ANOTHER SYSTEM APPROACHES THE COAST ON MEMORIAL DAY.

PEREIRA

GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
$$
National Weather Service Weather Forecast Office
