Prognostic Meteorological Discussion
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FXUS01 KWBC 222054
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
453 PM EDT TUE APR 22 2014

VALID 00Z WED APR 23 2014 - 00Z FRI APR 25 2014

...LATE SEASON SNOWFALL ACCUMULATIONS EXPECTED ACROSS THE CASCADES
AND NORTHERN ROCKIES...

...SEVERE WEATHER WILL BE POSSIBLE OVER THE SOUTHERN TO CENTRAL
HIGH PLAINS ON WEDNESDAY...

...CONDITIONS WILL BE SLOW TO CLEAR OUT IN THE NORTHEAST...

WIDESPREAD SHOWER ACTIVITY WILL CONTINUE TO DEVELOP ACROSS THE
NORTHWESTERN CORNER OF THE NATION THROUGH THE MIDDLE OF THE
WEEK...BEHIND A STRONG COLD FRONT SLOWLY PUSHING SOUTH AND EAST
OUT OF THE WESTERN U.S..  PERSISTENT ONSHORE FLOW FROM THE
PACIFIC...COMBINED WITH OROGRAPHIC EFFECTS...WILL HELP BOOST
PRECIPITATION TOTALS ALONG COASTAL AREAS FROM NORTHERN CALIFORNIA
TO WASHINGTON...AS WELL AS FARTHER INLAND OVER THE UPSLOPE SIDE OF
THE CASCADES AND NORTHERN ROCKIES.  ADDITIONALLY...FALLING
TEMPERATURES BEHIND THE FRONT WILL ALLOW FOR WIDESPREAD SNOW
SHOWERS ACROSS THE HIGHER ELEVATIONS...WITH IMPRESSIVE LATE SEASON
ACCUMULATIONS EXPECTED ALONG THE CASCADES...BITTERROOTS...AND
TETONS.

WEATHER WILL BECOME QUITE ACTIVE ACROSS THE CENTRAL U.S. ON
WEDNESDAY AS THE COLD FRONT IN THE WESTERN U.S. PUSHES EAST OF THE
ROCKIES.  A LINE OF CONVECTION IS EXPECTED TO FIRE UP AHEAD OF THE
BOUNDARY WHILE IT PROGRESSES THROUGH THE CENTRAL TO SOUTHERN HIGH
PLAINS AND HEADS TOWARDS THE MISSISSIPPI RIVER VALLEY.  MOISTURE
BEING SIPHONED FROM THE GULF OF MEXICO WILL FUEL MODERATE TO HEAVY
RAINS WITHIN DEVELOPING STORMS...AND AMPLE AMOUNTS OF INSTABILITY
WILL ALLOW FOR STORMS TO BECOME STRONG OR EVEN SEVERE...ESPECIALLY
OVER THE SOUTHERN TO CENTRAL HIGH PLAINS.  FARTHER NORTH...AN AXIS
OF RAIN WITH EMBEDDED THUNDERSTORMS SHOULD DEVELOP TO THE NORTH OF
A SURGING WARM FRONT...EXPANDING ACROSS THE DAKOTAS AND UPPER
MISSISSIPPI VALLEY.  BY THURSDAY MORNING...PRECIPITATION LIFTING
INTO NORTHERN MINNESOTA...WISCONSIN...AND THE UPPER PENINSULA OF
MICHIGAN COULD FALL AS SNOW.

NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE TO BREAKOUT AHEAD
OF COLD FRONT CROSSING THE APPALACHIANS TUESDAY NIGHT.  THE FRONT
SHOULD CLEAR MUCH OF THE EASTERN SEABOARD BY WEDNESDAY
MORNING...AND COOLER DRIER AIR WILL FILL IN BEHIND IT.  ALTHOUGH
THE BOUNDARY WILL BE QUICK TO DEPART THE COAST...CONDITIONS WILL
BE SLOW TO CLEAR OUT ACROSS THE NORTHEAST...WHERE A SURFACE LOW
DEEPENING OFFSHORE WILL BRING CONTINUED MOISTURE AND UNSETTLED
WEATHER INTO THE REGION.  THE MAJORITY OF PRECIPITATION WILL FALL
AS RAIN...BUT SNOW WILL BE A POSSIBILITY WITHIN THE HIGHER
ELEVATIONS OF INTERIOR NEW ENGLAND.

GERHARDT


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