Prognostic Meteorological Discussion
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000
FXUS01 KWBC 221955
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
355 PM EDT FRI SEP 22 2017

VALID 00Z SAT SEP 23 2017 - 00Z MON SEP 25 2017

...BELOW AVERAGE TEMPERATURES IN THE WESTERN HALF OF THE U.S. WITH
ABOVE AVERAGE TEMPERATURES IN THE EASTERN HALF...

...HEAVY RAIN AND THUNDERSTORMS IN THE CENTRAL U.S. ALONG A
SLOW-MOVING COLD FRONT...

A DEEP UPPER-LEVEL TROUGH IS IN PLACE ACROSS THE WESTERN U.S.,
WHILE AN UPPER-LEVEL RIDGE IS PRESENT OVER THE NORTHEASTERN U.S.
AT THE SURFACE, A COLD FRONT IS LOCATED ON THE EASTERN EDGE OF THE
TROUGH, STRETCHING FROM THE NORTHERN PLAINS INTO THE SOUTHWEST.
THIS SETUP IS LEADING TO A STRONG TEMPERATURE CONTRAST ACROSS THE
U.S. THE WEST IS EXPECTED TO BE MUCH COLDER THAN AVERAGE OVER THE
WEEKEND, WITH TEMPERATURES FORECAST TO BE UP TO 30 DEGREES BELOW
AVERAGE IN WYOMING IN PARTICULAR. ON THE OTHER HAND, THE EASTERN
U.S. WILL HAVE WIDESPREAD HIGH TEMPERATURES IN THE UPPER 80S AND
LOWER 90S. THIS IS 20-30 DEGREES ABOVE AVERAGE IN THE UPPER
MIDWEST AND THE NORTHEAST. THE TROUGH WILL SHIFT GRADUALLY
EASTWARD OVER THE NEXT COUPLE OF DAYS, ALLOWING THE COLD FRONT TO
MOVE SLOWLY WITH IT, STALLING BY SUNDAY. ALONG THE FRONT, RAIN AND
THUNDERSTORMS ARE LIKELY FOR THE PLAINS AND INTO THE UPPER MIDWEST
THROUGH THE WEEKEND. SOME STORMS ARE FORECAST TO CONTAIN HEAVY
RAINFALL, LEADING TO A SLIGHT CHANCE OF FLASH FLOODING. TODAY AND
TONIGHT THERE IS A SLIGHT RISK OF SEVERE WEATHER FOR PORTIONS OF
THE UPPER MIDWEST AS WELL. BEHIND THE FRONT IN THE COLD AIR, SNOW
IS EXPECTED TO CONTINUE FOR THE NORTHERN AND CENTRAL ROCKIES AND
IN THE CENTRAL GREAT BASIN.

POST-TROPICAL CYCLONE JOSE WILL CONTINUE TO WEAKEN OFF THE COAST
OF THE NORTHEAST, AND LIGHT RAIN AND WIND GUSTS OCCURRING IN NEW
ENGLAND WILL SUBSIDE AS IT WEAKENS. HIGH SURF ALONG THE EAST COAST
AND HAZARDOUS MARINE CONDITIONS COULD CONTINUE THROUGH THE
WEEKEND, HOWEVER. SEE THE NATIONAL HURRICANE CENTER`S WEBSITE FOR
MORE INFORMATION ON JOSE.

ELSEWHERE, WARM TEMPERATURES AND PLENTY OF MOISTURE WILL HELP FORM
SCATTERED THUNDERSTORMS ALONG THE GULF COAST AND IN THE SOUTHEAST
THROUGH THE WEEKEND.


TATE


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





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