567  
FXUS01 KWBC 020706  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
206 AM EST FRI FEB 02 2018  
 
VALID 12Z FRI FEB 02 2018 - 12Z SUN FEB 04 2018  
 
...UNSETTLED WEATHER WITH LOCALLY HEAVY RAIN AND SNOW WILL IMPACT  
THE PACIFIC NORTHWEST AND THE NORTHERN ROCKIES...  
 
...MUCH COLDER TEMPERATURES ARE EXPECTED TO SET UP ACROSS THE  
NORTHERN AND EASTERN U.S...  
 
...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...  
 
THE WEATHER IS EXPECTED TO REMAIN UNSETTLED TODAY AND INTO THE  
WEEKEND ACROSS PORTIONS OF THE PACIFIC NORTHWEST AND SPREADING  
OVER THE NORTHERN ROCKIES AS A SERIES OF STORM SYSTEMS OVER THE  
GULF OF ALASKA DROP SOUTHEAST AND INLAND ACROSS THE REGION. THIS  
WILL BRING HEAVY RAIN FOR THE COASTAL RANGES OF WASHINGTON STATE.  
HOWEVER, FOR THE HIGHER TERRAIN OF THE ADJACENT CASCADES AND  
ESPECIALLY THE INTERIOR RANGES OF THE NORTHERN ROCKIES SUCH AS THE  
BITTERROOTS AND TETONS, EXPECT HEAVY ACCUMULATING SNOW WITH  
LOCALLY AS MUCH AS 2 TO 3 FEET OF NEW SNOWFALL THROUGH THE WEEKEND.  
 
MEANWHILE, IN THE WAKE OF A COLD FRONT PUSHING OFF THE EAST COAST  
THIS MORNING, ARCTIC HIGH PRESSURE OVER THE MIDWEST WILL BE  
ADVANCING EAST AND WILL ALLOW DAYTIME TEMPERATURES ACROSS MUCH OF  
THE EASTERN U.S. TO DROP TO AS MUCH AS 10 TO 20 DEGREES BELOW  
NORMAL, AND WITH MANY LOCATIONS OVER THE OHIO VALLEY, MID-ATLANTIC  
AND NORTHEAST DROPPING TO BELOW FREEZING DURING THE DAY. THIS AREA  
OF HIGH PRESSURE WILL ADVANCE QUICKLY EAST TOWARD THE MID-ATLANTIC  
REGION ON SATURDAY AND THEN MOVE OFFSHORE THE EAST COAST BY  
SUNDAY. THIS WILL ALLOW TEMPERATURES TO BEGIN TO MODERATE A BIT 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 THIS WEEKEND  
AND FOSTER A THREAT OF ACCUMULATING SNOW ACROSS THE GREAT LAKES,  
CENTRAL APPALACHIANS AND THE NORTHEAST. GENERALLY A COLD RAIN WITH  
POSSIBLY SOME SOME SNOW INITIALLY ALONG WITH POCKETS OF FREEZING  
RAIN CAN BE EXPECTED OVER THE MID-ATLANTIC REGION. HEAVIER RAIN  
MEANWHILE IS EXPECTED FARTHER SOUTH FROM THE TENNESSEE VALLEY  
SOUTH TO THE GULF COAST STATES AND PARTS OF THE SOUTHEAST AS A  
SEPARATE AREA OF LOW PRESSURE IMPACTS THESE AREAS AND BRINGS  
PLENTY OF MOISTURE IN OFF THE GULF OF MEXICO.  
 
MUCH COLDER AIR WITH A REINFORCING SHOT OF ARCTIC HIGH PRESSURE IS  
THEN EXPECTED TO DROP SOUTH FROM CANADA BY SUNDAY AND BEGIN  
SPILLING OVER MUCH OF THE NORTHERN U.S. AND WITH A PARTICULAR  
FOCUS ON THE NORTHERN PLAINS AND UPPER MIDWEST. DAYTIME  
TEMPERATURES WILL ONLY REACH THE SINGLE DIGITS AND NIGHTTIME LOWS  
WILL BE WELL BELOW ZERO. THESE TEMPERATURES COUPLED WITH THE WIND  
WILL RESULT IN DANGEROUSLY COLD WINDCHILL VALUES.  
 
THE REMAINDER OF THE COUNTRY IS EXPECTED TO SEE DRY AND TRANQUIL  
WEATHER THROUGH THE WEEKEND AND THIS WILL INCLUDE THE SOUTHWEST  
U.S. WHERE AGAIN TEMPERATURES WILL GENERALLY BE ABOVE AVERAGE.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page