207  
FXUS01 KWBC 210801  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 AM EST MON JAN 21 2019  
 
VALID 12Z MON JAN 21 2019 - 12Z WED JAN 23 2019  
 
...VERY COLD AND BLUSTERY CONDITIONS IN THE EASTERN U.S. WILL  
MODERATE BY WEDNESDAY...  
 
...DEVELOPING LOW PRESSURE SYSTEM CURRENTLY BRINGING HEAVY SNOW  
OVER THE ROCKIES WILL BECOME THE NEXT WINTER STORM FOR NORTHERN  
PLAINS TO THE GREAT LAKES...  
 
...ACTIVE WEATHER RETURNS FOR THE PACIFIC NORTHWEST INTO THE  
INTERMOUNTAIN REGION...  
 
A BROAD AND ENERGETIC UPPER-LEVEL TROUGH IS CURRENTLY MOVING  
ACROSS NORTHERN CALIFORNIA WHERE RAIN HAS BEEN WIDESPREAD. THIS  
SYSTEM IS EXPECTED TO PENETRATE FURTHER INLAND AND DEVELOP INTO A  
LARGE LOW PRESSURE SYSTEM AS IT MOVES ACROSS THE ROCKIES TODAY,  
BRINGING WIDESPREAD MOUNTAIN SNOW FROM THE GREAT BASIN EASTWARD  
INTO MUCH OF THE NORTHERN AND CENTRAL ROCKIES. THE SYSTEM WILL  
THEN EXIT THE ROCKIES TONIGHT AND BECOME THE NEXT WINTER STORM FOR  
THE NORTHERN PLAINS AND EXPANDING INTO THE GREAT LAKES ON TUESDAY.  
UP TO 8 INCHES OF SNOW CAN BE EXPECTED OVER THE UPPER MIDWEST ON  
TUESDAY. BY WEDNESDAY MORNING, THE WINTRY PRECIPITATION SHOULD  
REACH NEW ENGLAND, WITH FREEZING RAIN POSSIBLE OVER THE NORTHERN  
AND CENTRAL APPALACHIANS. THE STORM WILL ALSO TAP INTO MILD AND  
MOIST AIR FROM THE GULF OF MEXICO. RAIN IS EXPECTED TO EXPAND  
ACROSS THE LOWER AND MID-MISSISSIPPI VALLEY ON TUESDAY NEAR A WARM  
FRONT AND AHEAD OF A STRONG COLD FRONT. SOME THUNDERSTORMS WILL  
BE POSSIBLE OVER THE EASTERN GULF STATES BY WEDNESDAY MORNING.  
 
IN THE EASTERN U.S., FRIGID AIR FROM CANADA WILL POUR INTO THE  
AREA IN THE WAKE OF THE MAJOR WINTER STORM. HIGH TEMPERATURES  
TODAY WILL BE MORE THAN 20 DEGREES BELOW NORMAL ACROSS MUCH OF THE  
NORTHEAST. THE FLOW OF FRIGID AIR OVER THE GREAT LAKES WILL  
PROMOTE LAKE-EFFECT SNOW AS WELL AS UPSLOPE SNOWFALL OVER PARTS  
OF THE CENTRAL APPALACHIANS THROUGH THIS EVENING. TEMPERATURES  
WILL BEGIN TO MODERATE ON TUESDAY AS THE ARCTIC HIGH PRESSURE  
SYSTEM SLIDES OFF THE EAST COAST.  
 
MEANWHILE, MORE ACTIVE WEATHER IS FORECAST TO REACH THE PACIFIC  
NORTHWEST ON TUESDAY AHEAD OF THE NEXT ENERGETIC PACIFIC CYCLONE.  
EXPECT COASTAL HEAVY RAIN AND WINDY CONDITIONS TO RESUME ON  
TUESDAY WITH SNOW SPREADING RAPIDLY EASTWARD INTO THE  
INTERMOUNTAIN REGION TUESDAY NIGHT, REACHING THE NORTHERN ROCKIES  
EARLY ON WEDNESDAY, AND INTO THE NORTHERN HIGH PLAINS WEDNESDAY  
MORNING.  
 
KONG  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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