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Southeast Discussion

By: NWS
By: NWS

COLD WEATHER TO CONTINUE THROUGH THE END OF THE WEEK... TONIGHT THROUGH WEDNESDAY NIGHT: THE LARGE SCALE PATTERN ACROSS THE NORTH AMERICA IS CURRENTLY BEING CONTROLLED IN LARGE PART BY A NEGATIVE PHASE OF THE NAO...CHARACTERIZED BY STRONG RIDGING OVER GREENLAND AND DEEP LAYERED LOW PRESSURE IN THE CANADIAN MARITIMES. THIS PATTERN TYPICALLY SIGNALS A DEEP AND SUSTAINED TROUGH OVER THE EASTERN CONUS...WHICH IS EXACTLY WHAT IS OCCURRING. THE DEEP TROUGH OVER THE EAST IS TAPPING A FEED OF ARCTIC AIR FROM THE POLAR REGIONS...WITH A SERIES OF SHORTWAVE TROUGHS CONTINUALLY REINFORCING THE COLD AIR MASS. THE LATEST SHORTWAVE IN THE PATTERN IS MOVING THROUGH ALABAMA THIS AFTERNOON...ACCOMPANIED BY A MID LEVEL CLOUD DECK AND THE OCCASIONAL SNOW FLURRY. THIS SHORTWAVE IS FORECAST TO MOVE EAST OF THE REGION THIS EVENING WITH THE CLOUD DECK DISSIPATING BY MIDNIGHT.


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