639  
FXUS01 KWBC 240751  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
250 AM EST SUN FEB 24 2019  
 
VALID 12Z SUN FEB 24 2019 - 12Z TUE FEB 26 2019  
 
...ADDITIONAL HEAVY SNOW EXPECTED FOR THE GREAT LAKES AND NORTHERN  
NEW ENGLAND, WITH HIGH WINDS BECOMING THE MAIN THREAT WITH THE  
SURFACE LOW...  
 
...HEAVY PRECIPITATION IN THE NORTHWEST, INCLUDING HEAVY RAIN  
ALONG THE OREGON/CALIFORNIA COAST AND HEAVY SNOW IN THE  
MOUNTAINS...  
 
THE SURFACE LOW PRESSURE SYSTEM THAT CAUSED A MYRIAD OF HAZARDOUS  
WEATHER IN THE U.S. OVER THE PAST COUPLE OF DAYS IS MOVING INTO  
THE UPPER GREAT LAKES, AND WILL CONTINUE TRACKING NORTHEASTWARD  
INTO CANADA AS A NEW SURFACE LOW DEVELOPS ALONG THE NORTHEAST  
COAST TODAY. ADDITIONAL SNOWFALL OF 6 TO 12 INCHES IS EXPECTED  
TODAY IN THE UPPER GREAT LAKES REGION BEFORE THE LOW EXITS, AND  
THE DEVELOPING LOW WILL HELP CAUSE SNOWFALL OF 10 TO 15 INCHES IN  
NORTHERN MAINE. LIGHT FREEZING RAIN ACCUMULATIONS ARE POSSIBLE IN  
NEW ENGLAND AS WELL. FARTHER SOUTH INTO THE MIDDLE MISSISSIPPI  
VALLEY WHERE SNOW HAS ENDED, BLOWING SNOW WILL CONTINUE TODAY AS  
STRONG WINDS DEVELOP. IN FACT, DUE TO THE STRENGTH OF THE LOW  
SYSTEM CREATING A TIGHT PRESSURE GRADIENT, AS WELL AS STRONG WINDS  
ALOFT, MUCH OF THE EASTERN HALF OF THE U.S. IS UNDER A HIGH WIND  
WARNING OR WATCH OR WIND ADVISORY TODAY. THE EASTERN SEABOARD WILL  
HAVE A RAINY SUNDAY MORNING BEFORE RAIN CLEARS OUT BY SUNDAY  
NIGHT, AND THE LOWER MISSISSIPPI AND TENNESSEE VALLEYS AND  
SOUTHEAST WILL FINALLY HAVE A DRY COUPLE OF DAYS.  
 
A PERSISTENT ATMOSPHERIC RIVER WILL TAKE AIM AT OREGON AND  
NORTHERN CALIFORNIA THROUGH THE BEGINNING OF THE WEEK, AS AN  
UPPER-LEVEL TROUGH DROPS SLOWLY SOUTHWARD THROUGH THE PACIFIC  
NORTHWEST. THIS WILL LEAD TO HEAVY PRECIPITATION IN THE NORTHWEST.  
ALONG THE SOUTHERN OREGON AND NORTHERN CALIFORNIA COAST, MAINLY  
HEAVY RAIN IS EXPECTED, AND THERE IS A RISK OF EXCESSIVE RAINFALL  
THROUGH TUESDAY. HOWEVER, THERE IS A CHANCE OF SNOW EVEN IN THE  
LOWER ELEVATION CITIES (LIKE SEATTLE AND PORTLAND) WITH THE  
PERSISTENT COLD CONDITIONS. HEAVY SNOW IS FORECAST FOR HIGHER  
ELEVATIONS--IN THE OREGON CASCADES, SNOW OF 4+ FEET IS POSSIBLE  
OVER THE NEXT COUPLE OF DAYS! THE SIERRA NEVADA AND SHASTA RANGES  
CAN EXPECT 2 TO 4 FEET OF SNOW, AND SO CAN THE SAWTOOTH  
MOUNTAINS/BITTERROOT RANGE AND TETONS/WIND RIVER MOUNTAINS.  
 
TEMPERATURE-WISE, A WARM SUNDAY (10 TO 20 DEGREES ABOVE AVERAGE)  
IS EXPECTED FOR THE EASTERN SEABOARD AHEAD OF COLD FRONTS THAT  
WILL PASS THROUGH AND LEAD TO MORE SEASONABLE CONDITIONS ON  
MONDAY. RECORD HIGHS, MAINLY FOR HIGH MINIMUM TEMPERATURES, COULD  
BE SET PARTICULARLY IN FLORIDA. MEANWHILE, A COLD HIGH PRESSURE  
SYSTEM MOVING GRADUALLY INTO THE PLAINS FROM CANADA WILL LEAD TO  
BITTERLY COLD TEMPERATURES ACROSS THE NORTHERN/CENTRAL PLAINS  
TODAY AND ADDITIONALLY FOR THE UPPER MIDWEST ON MONDAY.  
TEMPERATURES OF 20 TO 40 DEGREES BELOW AVERAGE ARE FORECAST THERE,  
AND RECORD COLD TEMPERATURES, ESPECIALLY LOW MAXIMUMS, ARE  
EXPECTED.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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