Prognostic Meteorological Discussion
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FXUS01 KWBC 301957
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
357 PM EDT SUN APR 30 2017

VALID 00Z MON MAY 1 2017 - 00Z WED MAY 3 2017

...LARGE STORM SYSTEM TO BRING A VARIETY OF WEATHER IMPACTS
THROUGH MONDAY...

A LARGE AND EXPANSIVE LOW PRESSURE SYSTEM HAS BEEN A HIGH IMPACT
EVENT OVER THE PAST COUPLE OF DAYS, AND IT WILL CONTINUE TO MAKE
WEATHER HEADLINES GOING INTO MONDAY.  THIS SYSTEM IS
MULTI-FACETED, WITH PRECIPITATION ASSOCIATED WITH THE UPPER LOW
OVER THE CENTRAL HIGH PLAINS, AND HEAVY RAIN AND STRONG
THUNDERSTORMS ALONG AND AHEAD OF THE COLD FRONT.  THROUGH SUNDAY
NIGHT, NUMEROUS STORMS WITH HEAVY RAINFALL AND GUSTY WINDS ARE
EXPECTED FOR THE CENTRAL GULF COAST AND EXTENDING NORTHWARD TO THE
SOUTHERN APPALACHIANS.  GIVEN THE RECENT HISTORY OF THIS STORM
SYSTEM, THE THUNDERSTORMS THAT DEVELOP WILL BE CAPABLE OF
PRODUCING HEAVY RAIN WHICH MAY RESULT IN LOCALIZED FLASH FLOODING,
ESPECIALLY FOR POOR DRAINAGE AREAS.  HOWEVER, THE MAGNITUDE OF THE
FLOODING WILL BE LESS COMPARED TO THE PAST 24 HOURS.

ON THE WESTERN SIDE OF THE LOW PRESSURE SYSTEM, UNSEASONABLY COLD
AIR IN PLACE FROM THE UPPER LOW WILL CREATE A WINTER-LIKE
ENVIRONMENT WITH LIGHT TO MODERATE SNOW ON THE NORTHWESTERN EDGE
OF THE PRECIPITATION SHIELD FROM WESTERN KANSAS TO NORTHERN
MINNESOTA THROUGH EARLY MONDAY.  A MULTITUDE OF WINTER WEATHER
BULLETINS FROM THE LOCAL FORECAST OFFICES ARE IN EFFECT, INCLUDING
BLIZZARD WARNINGS FOR NORTHWESTERN KANSAS AND SOUTHWESTERN
NEBRASKA! THE GREATEST SNOWFALL ACCUMULATIONS ARE EXPECTED
OVERNIGHT SINCE THE HIGHER SUN ANGLE TENDS TO LIMIT DAYTIME SNOW
ACCUMULATION THIS LATE IN THE SEASON.

ELSEWHERE, A PACIFIC COLD FRONT WILL BRING SCATTERED RAIN AND
MOUNTAIN SNOW SHOWERS FROM THE NORTHWEST TO THE NORTHERN ROCKIES
THROUGH EARLY MONDAY.  IN THE TEMPERATURE DEPARTMENT, EXPECT
READINGS TO BE WELL BELOW NORMAL FROM THE WESTERN HIGH PLAINS TO
THE UPPER MIDWEST, AND ABOVE NORMAL ON MONDAY AHEAD OF THE FRONT
ACROSS THE EAST COAST REGION.  MORE SEASONAL TEMPERATURES WILL
ARRIVE BY TUESDAY AFTER THE FRONT EXITS THE EAST COAST.

HAMRICK

GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_WBG.PHP

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