Prognostic Meteorological Discussion
Issued by NWS

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FXUS01 KWBC 270642
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
242 AM EDT TUE JUN 27 2017

VALID 12Z TUE JUN 27 2017 - 12Z THU JUN 29 2017

...SEVERE THUNDERSTORMS AND HEAVY RAIN POSSIBLE FROM THE CENTRAL
AND NORTHERN PLAINS TO THE MIDWEST TODAY AND WEDNESDAY...

A FRONTAL SYSTEM CROSSING THE NORTHERN ROCKIES THIS MORNING IS
FORECAST TO MOVE INTO THE NORTHERN AND CENTRAL PLAINS THIS
AFTERNOON. AREAS OF SHOWERS AND THUNDERSTORMS WILL ACCOMPANY THE
SYSTEM, BECOMING MORE WIDESPREAD FROM LATE AFTERNOON INTO TUESDAY
NIGHT AS THE SYSTEM REACHES THE MIDWEST. THUNDERSTORMS COULD
PRODUCE SEVERE WEATHER AND LOCALLY HEAVY RAINFALL. PLEASE REFER TO
PRODUCTS ISSUED BY THE STORM PREDICTION CENTER FOR FURTHER DETAILS
ON THE SEVERE WEATHER THREAT. ON WEDNESDAY, SHOWERS AND STORMS ARE
FORECAST TO CONTINUE SPREADING EAST ACROSS THE MIDWEST AND THE
GREAT LAKES, WITH SEVERE THUNDERSTORMS AND HEAVY RAINFALL ONCE
AGAIN POSSIBLE. SHOWERS AND STORMS WILL REACH THE NORTHEAST BY
THURSDAY MORNING. FARTHER SOUTH, GRADUALLY INCREASING MOISTURE AND
INSTABILITY WILL RESULT IN SCATTERED AFTERNOON AND EVENING
THUNDERSTORMS INCREASING THROUGH MID WEEK ACROSS THE GULF COAST
AND THE SOUTHEAST.

TEMPERATURES ARE FORECAST TO BE BELOW AVERAGE ACROSS THE EASTERN
HALF OF THE COUNTRY TODAY AS AN UPPER-LEVEL TROUGH REMAINS IN
PLACE. THE COOLEST TEMPERATURES ARE FORECAST ACROSS THE
APPALACHIANS AND THE LOWER GREAT LAKES, WHERE HIGHS ARE FORECAST
TO BE 10 TO 15 DEGREES BELOW AVERAGE. FARTHER WEST, TEMPERATURES
WILL REMAIN NEAR OR SLIGHTLY ABOVE AVERAGE FOR MOST AREAS,
ALTHOUGH THE NORTHWEST AND THE SOUTHWEST WILL SEE A RELATIVE
RESPITE FROM THE EXTREME HEAT OF RECENT DAYS. HIGHS WILL STILL
RISE INTO THE TRIPLE DIGITS ACROSS MUCH OF THE SOUTHWEST, HOWEVER.

RYAN


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

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