Prognostic Meteorological Discussion
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FXUS01 KWBC 130720
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
319 AM EDT SUN JUL 13 2014

VALID 12Z SUN JUL 13 2014 - 12Z TUE JUL 15 2014

...HEAVY SHOWERS AND THUNDERSHOWERS WILL AFFECT A LARGE AREA FROM
COLORADO FRONT RANGE EASTWARD TO THE OHIO VALLEY AND THE
NORTHEAST...

...HEAT TO CONTINUE IN THE PACIFIC NORTHWEST ALTHOUGH SOME RELIEF
BRIEFLY POSSIBLE IN COASTAL LOCATIONS...

...MIDSUMMER COOL SNAP STILL ON STORE FOR NORTH CENTRAL US INTO
THE MIDWEST DURING A PERIOD THAT IS OFTEN THE HOTTEST TIME OF THE
YEAR...

LOTS OF FACTORS WILL BE COMING TOGETHER OVER NEXT SEVERAL DAYS FOR
WIDESPREAD SHOWERS AND THUNDERSTORMS AS AN UNUSUALLY ACTIVE
PATTERN WILL TAKE HOLD OVER NEXT SEVERAL DAYS.  A SERIES OF
INITIALLY WEAK WEATHER DISTURBANCES WILL GIVE WAY TO A STRONG COLD
FRONT THAT WILL PUSH EASTWARD IN FITS AND STARTS. THIS COLD FRONT
WILL DRAG VERY COOL AREA ACROSS THE NORTHERN HEARTLAND OF THE
COUNTRY WILL FIRE UP NUMEROUS SHOWERS AND THUNDERSTORMS FROM THE
FRONT RANGE OF THE ROCKY MOUNTAINS ACROSS THE CENTRAL PLAINS, THE
MID MISSISSIPPI VALLEY, THE MIDWEST, OHIO VALLEY AND NORTHEAST.
ON SUNDAY, MONDAY AND TUESDAY, THE POSSIBILITY OF LOCALIZED FLASH
FLOODING AND SEVERE WEATHER WILL TRACK EASTWARD WITH WIDESPREAD
THUNDERSTORM ACTIVITY ESPECIALLY IN THE LATE AFTERNOON AND EVENING.

HOT WEATHER WITH SOME SCATTERED AFTERNOON AND EVENING SCATTERED
THUNDERSHOWERS WILL CONTINUE OVER THE FAR WEST WITH 100 DEGREE
WEATHER EXTENDING INTO THE PACIFIC NORTHWEST.  AN UPPER
DISTURBANCE IS EXPECTED TO MOVE ONSHORE ON MONDAY...BRINGING SOME
TEMPORARY RELIEF TO THE UNUSUALLY HOT TEMPERATURES ALONG COASTAL
OREGON AND WASHINGTON.

THE LEADING EDGE OF THE EXPECTED JULY COOL SNAP HAS ALREADY MOVED
ACROSS NORTH DAKOTA AND NORTHERN MINNESOTA AND WILL CONTINUE TO
MOVE SOUTH AND EASTWARD OVER THE NEXT 3 DAYS.  AS COOLER AIR
SPREADS ACROSS THE NORTHERN PLAINS, UPPER MISSISSIPPI VALLEY AND
MIDWEST ON SUNDAY, VERY COOL AIR ALOFT WILL LEAD TO INSTABILITY
SHOWERS ACROSS THE UPPER MIDWEST ON LATE SUNDAY INTO MONDAY.
DAYTIME TEMPERATURES ON MONDAY MAY BE IN THE 50S WHICH IS MORE
TYPICAL FOR LATE SEPTEMBER THAN WHAT IS TYPICALLY THE WARMEST TIME
OF THE YEAR.  THE COOL AIR WILL CONTINUE TO MOVE EASTWARD ACROSS
THE OHIO VALLEY INTO THE NORTHEAST ON TUESDAY, ACCOMPANIED BY
WIDESPREAD SHOWERS AND THUNDERSTORMS FOLLOWED BY TEMPERATURES AND
HUMIDITY THAT WILL BE ATYPICALLY LOW FOR MID JULY.

KOCIN



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