039  
FXUS01 KWBC 070758  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
257 AM EST WED FEB 07 2018  
 
VALID 12Z WED FEB 07 2018 - 12Z FRI FEB 09 2018  
 
...HEAVY RAIN WILL CONTINUE OVER PARTS OF THE GULF COAST STATES,  
TENNESSEE VALLEY AND SOUTHEAST FOR TODAY...  
 
...LOCALLY HEAVY SNOW AND SIGNIFICANT ICING IS EXPECTED ACROSS THE  
OHIO VALLEY AND THE NORTHEAST AS THE NEXT WINTER STORM ARRIVES...  
 
...VERY MILD TEMPERATURES WILL CONTINUE OVER MOST OF THE WESTERN  
U.S. THROUGH THE MIDDLE TO LATTER PART OF THE WEEK WITH SOME  
RECORD WARMTH POSSIBLE...  
 
THE WEATHER ACROSS THE PACIFIC NORTHWEST AND THE NORTHERN ROCKIES  
WILL BECOME MORE UNSETTLED ONCE AGAIN OVER THE NEXT COUPLE OF DAYS  
AS A NEW STORM SYSTEM DROPS SOUTHEAST AND APPROACHES THE REGION  
FROM BRITISH COLUMBIA. THIS WILL ALLOW A NEW SURGE OF MOISTURE TO  
ARRIVE WHICH WILL BRING RAIN TO COASTAL AREAS OF WASHINGTON, AND  
LOCALLY VERY HEAVY SNOW ACROSS THE NORTHERN ROCKIES. A PARTICULAR  
EMPHASIS WILL BE ON THE BITTERROOTS AND TO AN EXTENT THE TETONS  
WHERE THESE LOCATIONS ARE EXPECTED TO SEE NEW SNOWFALL TOTALS OF 1  
TO 3 FEET THROUGH AT LEAST EARLY FRIDAY. HEAVY SNOW WILL ALSO BE  
STREAKING OUT FARTHER EAST ACROSS THE NORTHERN HIGH PLAINS AND  
ESPECIALLY SOUTH-CENTRAL TO WESTERN MONTANA TO THE EAST OF THE  
CONTINENTAL DIVIDE AS THE SAME PACIFIC MOISTURE FETCH OVERRUNS AN  
ARCTIC FRONTAL ZONE BANKED UP AGAINST THE EASTERN SLOPES OF THE  
NORTHERN ROCKIES. SIGNIFICANT SNOWFALL TOTALS HERE IN EXCESS OF 1  
FOOT CAN BE EXPECTED OVER THE NEXT COUPLE OF DAYS.  
 
THE REMAINDER OF THE WESTERN U.S. THOUGH WILL BE MUCH DRIER AND  
WARMER BY COMPARISON AS HIGH PRESSURE PERSISTS OVER THE GREAT  
BASIN. THIS SHOULD REMAIN THE GENERAL THEME THROUGH THE BALANCE OF  
THE WEEK, AND WILL FOSTER HIGH TEMPERATURES OF AS MUCH AS 10 TO 20  
DEGREES ABOVE NORMAL ACROSS THE REGION. SOME RECORD WARMTH WILL BE  
POSSIBLE ESPECIALLY BY THURSDAY AS WARMER AIR POOLS OVER THE GREAT  
BASIN AHEAD OF THE NEXT STORM SYSTEM APPROACHING THE PACIFIC  
NORTHWEST.  
 
MEANWHILE, THE NEXT WINTER STORM WILL BE IMPACTING PARTS OF THE  
OHIO VALLEY AND NORTHEAST TODAY AS A STORM SYSTEM DEVELOPING OVER  
THE LOWER MISSISSIPPI VALLEY LIFTS NORTHEAST UP ACROSS THE  
TENNESSEE VALLEY, CENTRAL MID-ATLANTIC AND SOUTHERN NEW ENGLAND BY  
THIS EVENING. HEAVY SNOWFALL CAN BE EXPECTED NORTH AND WEST OF THE  
MAIN LOW TRACK AND AREAS OF THE NORTHERN MID-ATLANTIC REGION AND  
INTERIOR NORTHEAST WILL SEE THE HEAVIEST SNOWFALL WITH SOME AREAS  
SEEING AS MUCH AS 6 TO 12 INCHES. JUST SOUTH OF THIS AXIS OF HEAVY  
SNOW WILL BE A STRIPE OF FREEZING RAIN WHICH WILL EXTEND FROM THE  
OHIO VALLEY NORTHEAST UP ACROSS SOUTHERN NEW ENGLAND. SOME LOCALLY  
SIGNIFICANT ICING IS EXPECTED.  
FARTHER SOUTH ACROSS THE GULF COAST STATES AND INTO THE SOUTHEAST,  
THE CONCERN WILL BE HEAVY RAIN AND THUNDERSTORMS TODAY IN  
ASSOCIATION WITH THE SAME STORM SYSTEM DRIVING THE WINTER WEATHER  
HAZARDS FARTHER TO THE NORTH. HEAVY RAIN WILL ALSO BE IMPACTING  
THE TENNESSEE VALLEY AND THERE WILL BE SOME LOCALIZED CONCERNS FOR  
RUNOFF PROBLEMS AND FLOODING WITH AS MUCH AS 1 TO 2 INCHES OF RAIN  
BEFORE THE STORM SYSTEM LIFTS OUT LATER TODAY. COLDER TEMPERATURES  
AND DRIER CONDITIONS WILL ARRIVE ACROSS THE SOUTH AND THE EASTERN  
U.S. IN THE WAKE OF THIS SYSTEM THURSDAY, ALTHOUGH THERE WILL BE  
SOME ADDITIONAL POTENTIAL FOR LAKE EFFECT SNOW DOWNWIND OF LAKE  
ONTARIO IMPACTING THE TUG HILL PLATEAU REGION OF WESTERN NEW YORK.  
TEMPERATURES WILL BE GENERALLY NORMAL TO BELOW NORMAL ACROSS THE  
SOUTH AND THE EAST ON THURSDAY, BUT A WARMER TREND WILL BEGIN ON  
FRIDAY AHEAD OF A NEW STORM SYSTEM THAT WILL BE DEVELOPING OVER  
THE CENTRAL PLAINS.  
 
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