Preliminary Forecasts
Issued by NWS

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000
FXUS02 KWNH 290625
PREEPD

PRELIMINARY EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
125 AM EST MON DEC 29 2014

VALID 12Z THU JAN 01 2015 - 12Z MON JAN 05 2015


MUCH AND MORE AT THE MEDIUM RANGE DEPENDS ON THE EJECTION OF THE
SOUTHWESTERN TROUGH VIS-A-VIS THE PROGRESSION OF SHORTWAVES IN THE
NORTHERN STREAM ALONG THE CANADIAN BORDER. IF THE SOUTHWESTERN
SYSTEM TARRIES, A SIGNIFICANT REINFORCEMENT OF COLD AIR ACROSS THE
NORTHERN TIER OF STATES COULD SET THE STAGE FOR A FAR GREATER
OUTBREAK OF WINTRY PRECIPITATION THAN IF THE SOUTHERN VORTEX
PHASES WITH THE NORTHERN STREAM ENERGY. BECAUSE OF THE CRITICAL
SPACIAL AND TIMING ISSUES, RELIED PRIMARILY ON ENSEMBLE GUIDANCE
FOR THIS FORECAST. IN GENERAL, AREAS WEST OF THE CONTINENTAL
DIVIDE LOOK DRY AND AREAS TO THE EAST LOOK WET. COLD LOOKS LIKE A
SURE BET ACROSS THE FAR NORTH.


CISCO

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