Prognostic Meteorological Discussion
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000
FXUS01 KWBC 242000
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 PM EDT SAT JUN 24 2017

VALID 00Z SUN JUN 25 2017 - 00Z TUE JUN 27 2017

...A COOL WEATHER PATTERN IS IN STORE FOR MUCH OF THE EASTERN
TWO-THIRDS OF THE COUNTRY...

...RECORD HEAT CONTINUES FOR THE PACIFIC NORTHWEST...

...HEAT BECOMES LESS EXTREME IN THE DESERT SOUTHWEST...

THE SYNOPTIC WEATHER PATTERN ACROSS THE U.S. MAINLAND WILL FEATURE
A BROAD UPPER-LEVEL TROUGH IN THE EAST WHILE AN UPPER-LEVEL RIDGE
WILL PERSIST FOR A COUPLE MORE DAYS IN THE WEST.  THIS MEANS THAT
MUCH OF THE EASTERN TWO-THIRDS OF THE COUNTRY WILL BE COOLER THAN
NORMAL THROUGHOUT THE WEEKEND WHILE HEAT WILL PERSIST IN THE
WESTERN U.S.  A HIGH PRESSURE RIDGE, REMINISCENCE OF A COLD SEASON
ARCTIC OUTBREAK, IS FORECAST TO GRADUALLY BUILD ACROSS THE
NORTHERN AND CENTRAL PLAINS AND THEN EASTWARD INTO THE
MID-ATLANTIC FOR THE NEXT FEW DAYS.  THIS WILL KEEP HIGH
TEMPERATURES ONLY INTO THE 60`S AND 70`S IN THE NORTHERN/CENTRAL
PLAINS AND 70`S TO 80`S ACROSS THE MID-ATLANTIC WITH PLENTY OF
SUNSHINE, MAKING FOR VERY PLEASANT CONDITIONS IN THESE AREAS FOR
LATE JUNE!  AROUND THE GREAT LAKES INTO NORTHERN NEW ENGLAND
HOWEVER, A STATIONARY FRONT COMBINED WITH PERIODIC PASSAGES OF
UPPER-LEVEL DISTURBANCES WILL LEAD TO SCATTERED SHOWERS AND SOME
THUNDERSTORMS TO LINGER INTO MONDAY.

MEANWHILE, THE LEADING EDGE OF THE COOL AIR MASS WILL BECOME
NEARLY STATIONARY FROM THE SOUTHEAST U.S. COAST DOWN ALONG THE
GULF COAST AND WESTWARD INTO THE SOUTHERN ROCKIES FOR THE NEXT FEW
DAYS.  THIS WILL KEEP SCATTERED SHOWERS AND THUNDERSTORMS AROUND
THE AREA INTO MONDAY.  THUNDERSTORMS SHOULD BE SOMEWHAT MORE
NUMEROUS FROM NEW MEXICO INTO WESTERN TEXAS.

ALONG THE WEST COAST, HIGH PRESSURE RIDGE ALOFT WILL CONTINUE TO
KEEP TEMPERATURES WELL ABOVE NORMAL WITH DRY CONDITIONS THROUGH
THE WEEKEND.  THE MOST ANOMALOUS TEMPERATURES WILL BE ACROSS THE
PACIFIC NORTHWEST WHERE HIGHS ARE FORECAST TO EXCEED 100 DEGREES
AT SOME INTERIOR LOCATIONS TODAY AND SUNDAY.  THESE TEMPERATURES
ARE 15 TO 25 DEGREES ABOVE AVERAGE.  BY MONDAY, A COLD FRONT FROM
THE EASTERN PACIFIC IS FORECAST TO MOVE ONSHORE, BRINGING A GOOD
CHANCE OF THUNDERSTORMS ACROSS THE INTERMOUNTAIN REGION INTO THE
NORTHERN ROCKIES AND COOLER TEMPERATURES ALONG THE PACIFIC
NORTHWEST COAST.  MEANWHILE, HEAT WILL CONTINUE IN THE DESERT
SOUTHWEST THROUGH THE WEEKEND, ALBEIT NOT AS EXTREME AS IN
PREVIOUS DAYS.  NEVERTHELESS, HIGH TEMPERATURES ARE STILL EXPECTED
TO REACH 120 DEGREES NEAR THE TYPICALLY HOTTEST LOCATIONS.

KONG


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

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