Prognostic Meteorological Discussion
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857
FXUS01 KWBC 260847
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
447 AM EDT WED APR 26 2017

VALID 12Z WED APR 26 2017 - 12Z FRI APR 28 2017

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE LOWER/MIDDLE MISSISSIPPI...

...THERE IS AN EMBEDDED MODERATE RISK OF SEVERE THUNDERSTORMS OVER
PARTS OF LOWER MISSISSIPPI VALLEY...

...HEAVY SNOW FOR PARTS OF THE NORTHERN/CENTRAL ROCKIES...

...HEAVY RAIN POSSIBLE FROM PARTS OF WESTERN OHIO VALLEY
SOUTHWESTWARD TO THE LOWER MISSISSIPPI VALLEY...

A FRONT EXTENDING FROM THE UPPER GREAT LAKES/UPPER MISSISSIPPI
VALLEY SOUTHWESTWARD TO THE SOUTHERN HIGH PLAINS WILL MOVE
EASTWARD TO THE LOWER GREAT LAKES/OHIO VALLEY SOUTHWARD TO
SOUTHEAST/TENNESSEE VALLEY BY THURSDAY EVENING.  SHOWERS AND
THUNDERSTORMS WILL DEVELOP ALONG AND AHEAD OF THE BOUNDARY FROM
THE GREAT LAKES TO THE SOUTHERN PLAINS/WESTERN GULF COAST THAT
WILL ADVANCE SLOWLY EASTWARD TO THE GREAT LAKES/OHIO VALLEY TO THE
CENTRAL/SOUTHERN APPALACHIANS AND PARTS OF THE SOUTHEAST BY
THURSDAY EVENING.  SNOW WILL ALSO DEVELOP OVER PARTS OF THE
NORTHERN PLAINS AND UPPER GREAT LAKES/UPPER MISSISSIPPI VALLEY
THROUGH THURSDAY AFTERNOON.  IN ADDITION, RAIN/FREEZING RAIN WILL
DEVELOP OVER PARTS OF NORTHERN WISCONSIN AND THE NORTHWESTERN
UPPER PENINSULA OF MICHIGAN THROUGH THURSDAY MORNING.

MEANWHILE, A FRONT MOVING ONSHORE OVER THE PACIFIC NORTHWEST WILL
MOVE SOUTHEASTWARD TO THE SOUTHERN HIGH PLAINS/SOUTHERN PLAINS AND
WESTWARD INTO THE SOUTHWEST/SOUTHERN ROCKIES BY THURSDAY EVENING.
 THE STORM WILL PRODUCE MAINLY RAIN OVER THE PACIFIC NORTHWEST AND
NORTHERN CALIFORNIA WITH SNOW AND LOWER ELEVATION RAIN OVER PARTS
OF THE NORTHERN ROCKIES.  OVERNIGHT WEDNESDAY, THE SNOW LEVELS
WILL LOWER OVER THE PACIFIC NORTHWEST AND INTO THE GREAT BASIN
WITH SNOW DEVELOPING OVER THE CASCADES AND OVER PARTS OF THE GREAT
BASIN/CENTRAL ROCKIES.  AS THE SYSTEM MOVES EASTWARD SHOWERS AND
THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE CENTRAL/SOUTHERN
PLAINS ON THURSDAY INTO THURSDAY EVENING.  RAIN AND HIGHER
ELEVATION SNOW WILL CONTINUE OVER PARTS OF THE PACIFIC NORTHWEST
EASTWARD TO THE NORTHERN/CENTRAL ROCKIES THROUGH THURSDAY EVENING.


ELSEWHERE, LOW PRESSURE ALONG THE NORTHERN MID-ATLANTIC COAST WILL
SLOWLY MOVE NORTHWARD TO NEW ENGLAND COAST WHILE WEAKENING.  THE
STORM WILL PRODUCE RAIN ALONG THE NORTHERN MID-ATLANTIC COAST INTO
THE NORTHEAST THAT WILL SLOWLY WANE TO NEW ENGLAND BY THURSDAY
MORNING AND TO NEW ENGLAND COAST BY THURSDAY EVENING.


ZIEGENFELDER


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

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