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Extended Forecast Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1515Z Apr 22, 2015)
 
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Geographic Boundaries -  Map 1: Color  Black/White       Map 2: Color  Black/White


EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1115 AM EDT WED APR 22 2015

VALID 12Z SAT APR 25 2015 - 12Z WED APR 29 2015


OVER THE LAST FEW DATA CYCLES, THE GLOBAL NUMERICAL MODELS HAVE
TRENDED TOWARD MORE AMPLITUDE WITH THE FLOW ACROSS CENTRAL NORTH
AMERICA AT THE MEDIUM RANGE. THE CURRENT FORECAST PACKAGE REFLECTS
THIS TREND, WITH A MODEST SLOWING OF THE SYSTEMS ACROSS THE UNITED
STATES. THE NORTH-ATLANTIC OSCILLATION IS PROGGED TO BE IN A
NEGATIVE PHASE, WHICH TRANSLATES TO BELOW-NORMAL HEIGHTS OVER THE
CENTRAL AND EASTERN STATES, AND A SUPPRESSED STORM TRACK. THE BULK
OF THE WET WEATHER IS EXPECTED TO SHIFT FROM THE CENTRAL AND
NORTHERN HIGH PLAINS SUNDAY AND MONDAY, TO THE SOUTHEAST AND
CENTRAL APPALACHIANS TUESDAY AND WEDNESDAY. THE PACIFIC NORTHWEST
WILL REMAIN SHOWERY AS WELL, THOUGH WIDESPREAD HEAVY PRECIPITATION
IS CONTRAINDICATED BY THE MEAN RIDGE OVER THE FAR WEST. SNOWFALL
IS EXPECTED THROUGHOUT THE CASCADES AND CENTRAL AND NORTHERN
ROCKIES THIS WEEKEND INTO EARLY NEXT WEEK. THERE IS EVEN A CHANCE
OF SNOW THIS PERIOD AT THE HIGHEST ELEVATIONS OF THE CENTRAL AND
NORTHERN APPALACHIANS COURTESY OF THE BLOCK.


CISCO