376  
FXUS01 KWBC 030632  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
131 AM EST SAT FEB 03 2018  
 
VALID 12Z SAT FEB 03 2018 - 12Z MON FEB 05 2018  
 
...UNSETTLED WEATHER WITH LOCALLY HEAVY RAIN AND SNOW WILL  
CONTINUE OVER THE PACIFIC NORTHWEST AND THE NORTHERN ROCKIES...  
 
...A NEW STORM DEVELOPING OVER THE MIDWEST WILL BRING A THREAT OF  
SNOW TO AREAS OF THE GREAT LAKES, CENTRAL APPALACHIANS AND  
NORTHEAST BY THE END OF THE WEEKEND...  
 
...ARCTIC AIR WILL POUR SOUTH ACROSS THE NORTHERN PLAINS AND UPPER  
MIDWEST...  
 
MOIST ONSHORE FLOW ASSOCIATED WITH A SERIES OF STORM SYSTEMS WILL  
KEEP MUCH OF THE PACIFIC NORTHWEST TO THE NORTHERN ROCKIES IN AN  
UNSETTLED, AND WET PATTERN THROUGH THE WEEKEND AND INTO EARLY NEXT  
WEEK. THIS WILL BRING LOCALLY HEAVY RAIN TO COASTAL WASHINGTON  
WHILE THE HIGHER ELEVATIONS TO THE EAST WILL HAVE HEAVY SNOW.  
AREAS OF THE WASHINGTON CASCADES, AND ESPECIALLY THE INTERIOR  
RANGES OF THE NORTHERN ROCKIES INCLUDING THE BITTERROOTS, TETONS  
AND BIG HORNS WILL SEE AS MUCH AS 2 TO 3 FEET OF FRESH SNOW  
THROUGH MONDAY. FOR THE REST OF THE WESTERN U.S., MILD AND DRY  
CONDITIONS ARE EXPECTED TO CONTINUE. TEMPERATURES ACROSS THE  
SOUTHWEST, GREAT BASIN AND CALIFORNIA WILL GENERALLY BE NEAR OR  
ABOVE AVERAGE.  
 
MEANWHILE, VERY COLD AIR INITIALLY IN PLACE OVER PORTIONS OF THE  
EASTERN U.S. WILL QUICKLY ERODE AS HIGH PRESSURE ADVANCING OVER  
THE MID-ATLANTIC REGION TODAY MOVES OFFSHORE THE EAST COAST BY  
SUNDAY. THIS WILL ALLOW TEMPERATURES TO BEGIN TO MODERATE AS  
SOUTHERLY WINDS BEGIN TO RETURN. HOWEVER, AS THIS AREA OF HIGH  
PRESSURE MOVES OFFSHORE, A COMPLEX STORM SYSTEM WILL BE DEVELOPING  
OVER THE CENTRAL PLAINS AND MIDDLE MISSISSIPPI VALLEY AS SOME OF  
THE ENERGY IMPACTING THE NORTHWEST U.S. DROPS SOUTHEAST. MULTIPLE  
WAVES OF LOW PRESSURE WILL IMPACT THE BROADER MIDWEST THROUGH THE  
WEEKEND WHICH WILL ALLOW FOR A SWATH OF ACCUMULATING SNOW ACROSS  
THE GREAT LAKES, CENTRAL APPALACHIANS AND THE NORTHEAST. IT  
APPEARS THAT TEMPERATURES SHOULD WARM UP JUST ENOUGH ACROSS THE  
MID-ATLANTIC REGION FOR GENERALLY A COLD RAIN TO FALL HERE, BUT  
SOME SNOW INITIALLY ALONG WITH POCKETS OF FREEZING RAIN CAN BE  
EXPECTED. MORE WIDESPREAD AND HEAVIER RAIN IS EXPECTED FARTHER  
SOUTH FROM THE TENNESSEE VALLEY TO THE GULF COAST STATES AND  
INCLUDING INTERIOR AREAS OF THE SOUTHEAST AS A SEPARATE AREA OF  
LOW PRESSURE IMPACTS THIS REGION AND DRAWS A MORE SUBSTANTIAL AXIS  
OF MOISTURE NORTH IN OFF THE GULF OF MEXICO.  
 
ANOTHER BLAST OF ARCTIC AIR WILL PLUNGE SOUTH FROM CANADA LATE  
THIS WEEKEND AND ARRIVE OVER THE MUCH OF THE NORTHERN U.S. IN  
FACT, OVER AREAS OF THE NORTHERN PLAINS AND UPPER MIDWEST, DAYTIME  
TEMPERATURES WILL STRUGGLE TO GET OUT OF THE SINGLE DIGITS AND  
NIGHTTIME LOWS WILL BE WELL BELOW ZERO. THESE TEMPERATURES COUPLED  
WITH THE WIND WILL RESULT IN DANGEROUSLY COLD WINDCHILL VALUES.  
SOME OF THIS VERY COLD AIR WILL SETTLE SOUTHEAST ACROSS PORTIONS  
OF THE CENTRAL AND EASTERN U.S. GOING INTO THE EARLY PART OF NEXT  
WEEK.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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