Prognostic Meteorological Discussion
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FXUS01 KWBC 230758
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 AM EDT TUE MAY 23 2017

VALID 12Z TUE MAY 23 2017 - 12Z THU MAY 25 2017

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE SOUTHEAST AND THE SOUTHERN TIP OF TEXAS...

...HEAVY RAIN POSSIBLE OVER PARTS OF THE SOUTHERN
APPALACHIANS/SOUTHERN MID-ATLANTIC...

...HEAVY RAIN POSSIBLE OVER PARTS OF SOUTHEAST...

A DEVELOPING UPPER-LEVEL LOW OVER THE UPPER MISSISSIPPI VALLEY
WILL SLOWLY MOVE SOUTHWARD TO THE MIDDLE MISSISSIPPI AND TENNESSEE
VALLEYS BY WEDNESDAY EVENING.  AN OLD BOUNDARY EXTENDING FROM THE
MID-ATLANTIC SOUTHWESTWARD TO THE CENTRAL GULF COAST WILL AID IN
DEVELOPING SHOWERS AND THUNDERSTORMS FROM THE SOUTHERN
MID-ATLANTIC TO THE CENTRAL GULF COAST THAT WILL EXTEND FROM THE
SOUTHERN MID-ATLANTIC TO THE SOUTHEAST BY TUESDAY EVENING.  THE
SHOWERS AND THUNDERSTORMS WILL GENERALLY MOVE OFF THE
MID-ATLANTIC/SOUTHEAST COAST OVERNIGHT TUESDAY.  A FRONT
ASSOCIATED WITH THE UPPER-LEVEL LOW WILL AID IN PRODUCING RAIN
OVER PARTS OF THE UPPER/MIDDLE MISSISSIPPI VALLEY AND THE UPPER
GREAT LAKES ON TUESDAY MORNING.  THE RAIN WILL TRANSITION INTO
SHOWERS AND THUNDERSTORMS BY TUESDAY AFTERNOON WILL DEVELOP OVER
PARTS OF THE UPPER GREAT LAKES TO MIDDLE MISSISSIPPI VALLEY AND
THE SOUTHERN PLAINS

MEANWHILE, A RATHER COMPACT AND DEEP UPPER-LEVEL LOW IS FORECAST
TO DIP SOUTHEASTWARD FROM BRITISH COLUMBIA INTO THE NORTHWESTERN
U.S. DURING THE NEXT FEW DAYS.  THIS WILL TRIGGER THE FORMATION OF
A RATHER STRONG LOW PRESSURE SYSTEM TO BE CENTERED OVER ALBERTA
WEDNESDAY MORNING.  A SURGE OF COOL AIR WILL ARRIVE BEHIND A
STRONG COLD FRONT, REPLACING THE RECENT SPELL OF MILD WEATHER OVER
THE PACIFIC NORTHWEST.  THE HIGHEST ELEVATIONS OF THE NORTHERN
CASCADES AND NORTHERN ROCKIES COULD EVEN SEE SNOW MOVING IN ON
WEDNESDAY.  THE FRONT WILL CONTINUE TO PUSH RAPIDLY TO THE SOUTH
AND EAST, TRIGGERING SHOWERS AND THUNDERSTORMS DURING THE DAY ON
WEDNESDAY FROM THE SIERRAS EASTWARD ACROSS THE GREAT BASIN,
NORTHERN UTAH, WYOMING, MONTANA AND THE NEARBY HIGH PLAINS.


ZIEGENFELDER


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

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