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000
FXUS01 KWBC 240850
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
449 AM EDT FRI MAY 24 2013

VALID 12Z FRI MAY 24 2013 - 12Z SUN MAY 26 2013

...UNSEASONABLY COLD ACROSS MUCH OF THE MIDWEST AND EASTERN
U.S....

...MODERATE TO LOCALLY HEAVY PRECIPITATION ACROSS THE NORTHEAST...

...SHOWERS AND THUNDERSTORMS ACROSS THE PLAINS INTO THE
MISSISSIPPI VALLEY...

...BELOW AVERAGE TEMPERATURES ACROSS THE WEST...

A PAIR OF DEEP UPPER LOWS WILL PROVIDE BELOW AVERAGE TEMPERATURES
FOR BOTH THE WESTERN AND EASTERN THIRDS OF THE CONTIGUOUS UNITED
STATES WHILE GENERATING UNSETTLED WEATHER OVER THE NORTHWESTERN
AND NORTHEASTERN CORNERS.  ACROSS THE EASTERN U.S., A DEEP UPPER
TROUGH MOVING ACROSS THE OHIO VALLEY THIS MORNING IS EXPECTED TO
CONTINUE  AMPLIFYING TODAY AS IT MOVES INTO THE EAST, WITH A
CLOSED LOW DEVELOPING AND MOVING SLOWLY NORTHEASTWARD ALONG THE
NORTHEAST COAST ON SATURDAY.  THE EXPECTED RESULT IS A PROLONGED
PRECIPITATION EVENT STRETCHING INTO THE HOLIDAY WEEKEND ACROSS THE
PARTS OF THE NORTHEAST, WITH MUCH BELOW AVERAGE TEMPERATURES.  AS
THE UPPER LOW AMPLIFIES OVERHEAD ON SATURDAY, SNOW MIXING WITH
RAIN IS POSSIBLE ACROSS THE HIGHER ELEVATIONS OF THE ADIRONDACKS
AND MOUNTAINS OF NORTHERN NEW ENGLAND.

ACROSS THE WEST, BELOW AVERAGE TEMPERATURES ARE EXPECTED AS WELL
AS A CLOSED LOW/DEEP UPPER TROUGH MOVES OVERHEAD.  SHOWERS WILL
CONTINUE ACROSS THE NORTHWEST INTO THE NORTHERN ROCKIES, WITH SOME
HIGHER ELEVATION SNOWS TODAY.  HEADING INTO THE WEEKEND,
TEMPERATURES WILL BEGIN TO MODERATE, WITH DRYING CONDITIONS AS THE
UPPER LOW LIFTS INTO WESTERN CANADA.  HOWEVER AN UPPER DISTURBANCE
DROPPING AROUND THE BACKSIDE OF THE LOW WILL BRING A CHANCE FOR
MORE SHOWERS BACK INTO WESTERN OREGON BY SATURDAY EVENING.

OVER THE CENTRAL U.S., RETURNING MOISTURE/WARM AIR WILL ENCOURAGE
SCATTERED SHOWERS AND THUNDERSTORMS BOTH DAYS ACROSS THE PLAINS.
UPPER DISTURBANCES INTERACTING WITH THIS MOISTURE MAY PRODUCE
ORGANIZED STORMS, GENERATING LOCALLY HEAVY RAINS, ACROSS PARTS OF
TEXAS AND THE CENTRAL PLAINS INTO THE MID MISSISSIPPI VALLEY.

PEREIRA

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