Prognostic Meteorological Discussion
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417
FXUS01 KWBC 231958
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 PM EDT SAT JUL 23 2016

VALID 00Z SUN JUL 24 2016 - 00Z TUE JUL 26 2016

...DANGEROUSLY HOT TEMPERATURES EXPECTED ACROSS PORTIONS OF THE
CENTRAL AND EASTERN U.S. THIS WEEKEND...

...SEVERE THUNDERSTORMS POSSIBLE ACROSS PORTIONS OF THE NORTHERN
PLAINS AND UPPER MIDWEST TONIGHT...

...HEAVY RAINFALL AND FLASH FLOODING POSSIBLE FROM THE NORTHERN
PLAINS TO THE OHIO VALLEY...


THE BIG STORY ACROSS THE NATION THIS WEEKEND WILL BE AN EXPANSIVE
AREA OF HIGH PRESSURE AT THE MID AND UPPER LEVELS OF THE
ATMOSPHERE ANCHORED OVER THE SOUTHERN TIER STATES OVER THE NEXT
SEVERAL DAYS. THIS WILL RESULT IN AFTERNOON HIGH TEMPERATURES
ACROSS PORTIONS OF THE CENTRAL AND EASTERN U.S. AS MUCH AS 5 TO 15
DEGREES ABOVE NORMAL, WHICH MAY THREATEN THE RECORD BOOKS IN MANY
PLACES. THERE IS A WIDESPREAD AREA OF HEAT ADVISORIES AND
EXCESSIVE HEAT WARNINGS IN PLACE FROM THE CENTRAL PLAINS/MIDWEST
TO THE OHIO VALLEY/MID-ATLANTIC FOR HEAT INDICES APPROACHING AND
SURPASSING 100 DEGREES.

WIDESPREAD SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE
ACROSS MUCH OF THE UPPER MIDWEST AND UPPER GREAT LAKES TONIGHT
AHEAD OF A COLD FRONT PUSHING EASTWARD THROUGH THE NORTHERN PLAINS
THIS AFTERNOON. STORMS WILL BE CAPABLE OF PRODUCING SEVERE WEATHER
AND FLASH FLOODING. WET WEATHER WILL PUSH INTO THE OHIO VALLEY AND
NORTHEAST SUNDAY AND MONDAY, WITH LOCALIZED HEAVY RAINFALL AND
FLASH FLOODING POSSIBLE FROM THE MIDDLE MISSISSIPPI VALLEY TO THE
OHIO VALLEY. BEHIND THE BOUNDARY, TEMPERATURES SHOULD RETURN TO
NEAR NORMAL AND MORE COMFORTABLE VALUES.

ELSEWHERE, AFTERNOON SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS
PORTIONS OF THE SOUTHEAST AND GULF COAST STATES AS A WARM, MOIST,
AND UNSTABLE AIR MASS REMAINS IN PLACE. FOR THE SOUTHWEST AND
ROCKIES, WEAK MONSOONAL FLOW INTO THE REGION KEEPS MAINLY
DIURNALLY DRIVEN SHOWERS AND STORMS IN THE FORECAST THE NEXT
COUPLE OF DAYS.


SANTORELLI


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