Prognostic Meteorological Discussion
Issued by NWS

000
FXUS02 KWBC 200457
PMDEPD

EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1256 AM EDT THU JUN 20 2013

VALID 12Z SUN JUN 23 2013 - 12Z THU JUN 27 2013


THE EUROPEAN CENTRE ENSEMBLE MEAN HAS BEEN LEADING THE WAY AMONG
THE GLOBAL NUMERICAL MODELS WITH THE RETROGRESSION INDICATED AT
THE MEDIUM RANGE ACROSS THE UNITED STATES, SO CONTINUE TO RELY ON
ITS MASS FIELDS AS A SYNOPTIC GUIDE. THE EJECTION OF SHORTWAVE
ENERGY ACROSS THE NORTHERN TIER OF STATES THIS PERIOD WILL WRING
OUT WIDESPREAD SHOWERS FROM THE NORTHERN PLAINS TO THE NORTHEAST
ALONG THE AND NORTH OF THE RETREATING POLAR FRONT, WITH
TEMPERATURES AVERAGING AT OR BELOW NORMAL. VERY WARM WEATHER IS
STILL EXPECTED SOUTH OF THE BOUNDARY FROM THE OHIO VALLEY TO THE
NORTHERN MID ATLANTIC REGION WITH THE TEMPORARY RISE IN HEIGHTS.
THE GULF COAST AND SOUTHEAST WILL REMAIN SHOWERY AS AN UPPER LOW
DRIFTS WESTWARD ON THE EQUATORIAL SIDE OF THE SUBTROPICAL RIDGE
THERE. THE FAR SOUTHWEST WILL REMAIN DRY. THE MOST ANOMALOUS
RAINFALL IS LIKELY OVER COASTAL NORTHERN CALIFORNIA AS A NEW
TROUGH DIGS IN ITS HEELS JUST OFFSHORE.


CISCO

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