Prognostic Meteorological Discussion
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000
FXUS01 KWBC 300739
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
339 AM EDT TUE JUN 30 2015

VALID 12Z TUE JUN 30 2015 - 12Z THU JUL 02 2015

...SEVERE THUNDERSTORMS POSSIBLE FOR PORTIONS OF THE SOUTHEAST,
OHIO VALLEY, AND MID-ATLANTIC...

...ABOVE AVERAGE TEMPERATURES CONTINUE FOR THE NORTHWESTERN U.S...

AN UPPER-LEVEL TROUGH AND A COUPLE SURFACE FRONTAL BOUNDARIES
MOVING ACROSS THE GREAT LAKES TODAY WILL PROVIDE SUPPORT FOR
SCATTERED SHOWERS AND THUNDERSTORMS MUCH OF THE EASTERN THIRD OF
THE COUNTRY. A WARM FRONT MOVING NORTHWARD ACROSS THE MID-ATLANTIC
STATES WILL PROVIDE ADDITIONAL FOCUS FOR SHOWERS AND THUNDERSTORMS
ALONG AND NORTH OF THE FRONT AS IT MOVES INTO THE NORTHEAST BY
THIS EVENING. THE STORM PREDICTION CENTER IS FORECASTING A SLIGHT
RISK OF SEVERE THUNDERSTORMS OVER A LARGE AREA INCLUDING PORTIONS
OF THE SOUTHEAST, OHIO VALLEY, AND MID-ATLANTIC TODAY INTO
TONIGHT. PLEASE REFER TO PRODUCTS ISSUED BY THE SPC FOR FURTHER
DETAILS ON THE SEVERE WEATHER THREAT.

AN ADDITIONAL AREA OF UPPER-LEVEL ENERGY WILL MOVE INTO THE
NORTHERN PLAINS LATE TODAY INTO WEDNESDAY, WITH AN ASSOCIATED
SURFACE LOW PRESSURE SYSTEM FORECAST TO DEVELOP ALONG A WEST-EAST
ORIENTED FRONTAL BOUNDARY EXTENDING FROM THE CENTRAL PLAINS INTO
THE ROCKIES. THIS SYSTEM WILL BRING GOOD CHANCES FOR SHOWERS AND
THUNDERSTORMS TO MUCH OF THE CENTRAL AND NORTHERN PLAINS TONIGHT
INTO WEDNESDAY, WITH THE POTENTIAL FOR AN AREA OF WIDESPREAD
SHOWERS AND THUNDERSTORMS WEDNESDAY MORNING THE MIDDLE MISSISSIPPI
VALLEY. THE STORM PREDICTION CENTER IS FORECASTING A SLIGHT RISK
OF SEVERE THUNDERSTORMS THROUGH TONIGHT ACROSS PORTIONS OF THE
NORTHERN HIGH PLAINS.

ACROSS THE WEST, THE STORY WILL REMAIN THE SAME ONE THAT HAS BEEN
SEEN FOR DAYS, WITH A LARGE UPPER-LEVEL RIDGE REMAINING
ENTRENCHED. THE RIDGE WILL KEEP ABOVE AVERAGE TEMPERATURES IN
PLACE, PARTICULARLY ACROSS THE INTERIOR NORTHWEST, WHERE AFTERNOON
HIGH TEMPERATURES OF 10 TO 20 DEGREES ABOVE AVERAGE WILL CONTINUE
THROUGH WEDNESDAY. LOW-LEVEL FLOW WILL CONTINUE TO TRANSPORT
MOISTURE FROM THE GULF OF MEXICO AND THE GULF OF CALIFORNIA
NORTHWARD INTO THE WESTERN U.S. THIS WILL BE SUFFICIENT FOR
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS -- MOST LIKELY IN
AREAS OF TERRAIN. AS HAS BEEN THE CASE FOR THE PAST FEW DAYS, MOST
AREAS WILL REMAIN DRY.

RYAN


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





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