Prognostic Meteorological Discussion
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173
FXUS01 KWBC 281955
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
354 PM EDT SUN MAY 28 2017

VALID 00Z MON MAY 29 2017 - 00Z WED MAY 31 2017

...A LINGERING UPPER-LEVEL LOW WILL KEEP COOL AND SHOWERY
CONDITIONS FROM THE NORTHERN PLAINS EASTWARD TO NEW ENGLAND...

...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUE ALONG THE EAST
COAST AS WELL AS OVER THE DEEP SOUTH WHERE HEAVY DOWNPOURS ARE
POSSIBLE...

...HOT CONDITIONS EXPECTED FOR THE INTERIOR PACIFIC NORTHWEST AND
THE DESERT SOUTHWEST...

A LARGE UPPER-LEVEL LOW IS FORECAST TO DEEPEN AND MOVE SLOWLY
EASTWARD ACROSS THE GREAT LAKES OVER THE NEXT COUPLE DAYS.  THIS
WILL KEEP TEMPERATURES BELOW NORMAL FROM MUCH OF THE GREAT PLAINS
EASTWARD ACROSS THE MISSISSIPPI VALLEY, THE GREAT LAKES, AND INTO
NEW ENGLAND.  THE LARGE CYCLONIC CIRCULATION WILL ROTATE
SMALL-SCALE DISTURBANCES INTO THE NORTHERN U.S., RESULTING IN
OCCASIONAL SHOWERS AND ISOLATED THUNDERSTORMS, ESPECIALLY DURING
THE AFTERNOON AND EARLY EVENING HOURS THROUGH TUESDAY.  MEANWHILE,
THE MAIN FRONT ASSOCIATED WITH THIS SYSTEM SHOULD GRADUALLY PUSH
EASTWARD INTO THE EASTERN SEABOARD ON MEMORIAL DAY AND BECOMES
NEARLY STATIONARY ACROSS THE MID-ATLANTIC ON TUESDAY.  THIS WILL
KEEP A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS UP AND DOWN THE
EAST COAST THROUGH TUESDAY.  THE TRULY WARM AND HUMID AIR WILL
REMAIN SOUTH OF THE FRONT OVER THE SOUTHEAST AND ACROSS THE DEEP
SOUTH THROUGH TUESDAY, WHERE CLUSTERS OF THUNDERSTORMS CAN BE
EXPECTED.  SOME OF THESE THUNDERSTORMS COULD BE HEAVY ENOUGH TO
RESULT IN FLASH FLOODING JUST INLAND FROM THE WESTERN GULF COAST
THROUGH TONIGHT.

MEANWHILE, A HIGH PRESSURE SYSTEM SIMILAR TO ONE IN THE COLD
SEASONS IS FORECAST TO BUILD SOUTHWARD FROM WESTERN CANADA INTO
THE NORTHERN HIGH PLAINS.  THIS WILL SEND ANOTHER BATCH OF COOL
CANADIAN AIR INTO THE AREA DURING THE NEXT COUPLE OF DAYS.  IN
CONTRAST, A BRIEF HEAT WAVE IS FORECAST FOR THE INTERIOR PACIFIC
NORTHWEST THROUGH TUESDAY AS HIGH TEMPERATURES ARE EXPECTED TO
REACH LOW TO MID 90`S OVER THE SNAKE RIVER VALLEY.  MEANWHILE,
TRIPLE-DIGIT HEAT IS EXPECTED FOR THE DESERT SOUTHWEST DUE TO THE
INFLUENCE OF AN UPPER-LEVEL RIDGE.

KONG


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

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