Prognostic Meteorological Discussion
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000
FXUS01 KWBC 272000
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 PM EDT SAT MAY 27 2017

VALID 00Z SUN MAY 28 2017 - 00Z TUE MAY 30 2017

...SHOWERS AND THUNDERSTORMS WILL GRADUALLY SHIFT FROM THE
MID-SECTION OF THE COUNTRY TO THE EAST COAST AND THE DEEP SOUTH
THROUGH MEMORIAL DAY...

...VERY WARM WEATHER EXPECTED TO DEVELOP OVER THE PACIFIC
NORTHWEST WHILE COOL WEATHER PERSISTS FROM THE GREAT PLAINS
EASTWARD TO NEW ENGLAND...

THIS MEMORIAL DAY WEEKEND WILL FEATURE A BROAD UPPER-LEVEL TROUGH
DOMINATING MUCH OF THE EASTERN TWO-THIRDS OF THE COUNTRY.  THIS
WILL RESULT IN COOLER THAN NORMAL TEMPERATURES FROM THE PLAINS
EASTWARD TO NEW ENGLAND THROUGH MEMORIAL DAY.  THE LEADING EDGE OF
THE COOL AIR WILL SLOWLY EDGE TOWARDS THE SOUTH AND EAST.  SHOWERS
AND THUNDERSTORMS ASSOCIATED WITH THE FRONTAL BOUNDARY WILL
GRADUALLY SHIFT FROM THE CENTRAL U.S. THIS AFTERNOON AND EVENING,
AND SPREAD INTO THE DEEP SOUTH AND MUCH OF THE EAST COAST BY
MEMORIAL DAY.  THE FRONT IS EXPECTED TO BECOME STATIONARY ACROSS
THE MID-ATLANTIC.  THIS WILL KEEP THE WARM AND HUMID AIR OVER THE
SOUTHEAST WHILE OVERCAST AND COOL WEATHER PERSISTS FROM THE
MID-ATLANTIC NORTHWARD.  AS A LOW PRESSURE CENTER DEVELOPS AND
HEADS TOWARDS THE GREAT LAKES, SHOWERS AND THUNDERSTORMS WILL
SPREAD ACROSS THE OHIO VALLEY ON SUNDAY BEFORE REACHING THE
MID-ATLANTIC, FOLLOWED BY NEW ENGLAND ON MEMORIAL DAY.  MEANWHILE,
SHOWERS AND THUNDERSTORMS NEAR THE TAIL END OF THE FRONT COULD BE
HEAVY ENOUGH TO LEAD TO FLASH FLOODING OVER SOUTHERN TEXAS ON
MEMORIAL DAY.

A LINGERING BROAD UPPER-LEVEL LOW CENTERED NORTH OF THE GREAT
LAKES WILL CONTINUE TO SEND PERIODIC INTRUSIONS OF COOL AIR FROM
CENTRAL CANADA DOWN INTO THE PLAINS, KEEPING TEMPERATURES THERE
COOLER THAN NORMAL THROUGH MEMORIAL DAY.  IN CONTRAST, WARM AND
DRY CONDITIONS ARE EXPECTED TO DEVELOP OVER THE PACIFIC NORTHWEST.
 HIGH TEMPERATURES ARE FORECAST TO REACH THE LOWER 90S ON SUNDAY,
WHICH ARE 10 TO 20 DEGREES ABOVE AVERAGE.  THE WARM WEATHER IS
EXPECTED TO SPREAD FARTHER SOUTH AND EAST INTO THE GREAT BASIN ON
MEMORIAL DAY.

KONG


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

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