665  
FXUS01 KWBC 072001  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
300 PM EST THU FEB 07 2019  
 
VALID 00Z FRI FEB 08 2019 - 00Z SUN FEB 10 2019  
 
...HEAVY SNOWS SHOULD COME TO AN END LATE TONIGHT ACROSS THE UPPER  
GREAT LAKES, WITH HEAVY RAINFALL POSSIBLE IN THE OHIO AND  
TENNESSEE VALLEYS...  
 
...BIG TEMPERATURE SWINGS EXPECTED AS THE ARCTIC FRONT SWEEPS  
EASTWARD THURSDAY FROM THE SOUTHERN PLAINS INTO THE MID TO LOWER  
MISSISSIPPI VALLEY AND OHIO VALLEY AND ACROSS THE EASTERN SEABOARD  
ON FRIDAY...  
 
...ACCUMULATING SNOWFALL POSSIBLE ACROSS MUCH OF THE WESTERN U.S.  
WITH SIGNIFICANT ACCUMULATIONS POSSIBLE NEAR SEATTLE...  
 
A DEEPENING AREA OF LOW PRESSURE CURRENTLY LOCATED IN THE UPPER  
GREAT LAKES REGION, WILL CONTINUE MOVING NORTHEASTWARD INTO  
EASTERN CANADA BY EARLY FRIDAY. EXPECT HEAVY SNOWFALL TO CONTINUE  
TO THE NORTH AND WEST OF THE LOW TONIGHT, WITH BLIZZARD CONDITIONS  
POSSIBLE AS GUSTY WINDS ACCOMPANY THIS SYSTEM. SOUTH OF HERE, A  
STRONG COLD FRONT WILL PUSH THROUGH THE OHIO VALLEY THIS EVENING,  
WITH HEAVY RAINFALL AND THUNDERSTORMS POSSIBLE ALONG AND AHEAD OF  
THE BOUNDARY. FLASH FLOODING AND ISOLATED SEVERE THUNDERSTORMS  
REMAIN A THREAT INTO THIS EVENING. WARM AIR SURGING NORTHWARD  
AHEAD OF THE COLD FRONT WILL CONTINUE TO SUPPORT WELL ABOVE NORMAL  
TEMPERATURES ACROSS MUCH OF THE EASTERN SEABOARD TONIGHT, BUT  
EXPECT TEMPERATURES TO DROP QUICKLY BACK TO NEAR NORMAL VALUES  
DURING THE DAY ON FRIDAY FOLLOWING THE PASSAGE OF THE COLD FRONT.  
 
STRONG SURFACE HIGH PRESSURE DROPPING INTO THE CENTRAL U.S. BEHIND  
THE EASTERN U.S. SYSTEM WILL ALLOW FOR A MUCH BELOW NORMAL AIRMASS  
TO FILTER INTO THE PLAINS REGION AND EASTWARD TOWARDS THE MIDWEST  
AND OHIO VALLEY. THE COLDEST SPOT IS EXPECTED TO BE ACROSS THE  
NORTHERN PLAINS WHERE HIGH TEMPERATURES ARE FORECAST TO STAY BELOW  
ZERO INTO THIS WEEKEND. ACROSS THE MIDWEST, AND AS FAR SOUTH AS  
TEXAS, TEMPERATURES COULD BE AS MUCH AS 10 TO 20+ DEGREES BELOW  
NORMAL FRIDAY AND INTO SATURDAY.  
 
THE WESTERN U.S. SHOULD STAY ACTIVE THROUGH MUCH OF THE SHORT  
RANGE PERIOD AS A SERIES OF UPPER LEVEL SYSTEMS AFFECTS THE  
REGION. SNOW LEVELS WILL BE FALLING AS A STRONG MID-UPPER LEVEL  
LOW STRENGTHENS AND DROPS INTO THE PACIFIC NORTHWEST BY THIS  
WEEKEND. WHILE THE HEAVIEST SNOW ACCUMULATIONS WILL BE IN THE  
HIGHER TERRAIN OF THE CASCADES AND INTO THE SIERRA NEVADA,  
ACCUMULATING SNOWFALL IS ALSO POSSIBLE AT THE LOWER ELEVATIONS  
TOO, INCLUDING SEATTLE AND PORTLAND. WINTER STORM WARNINGS ARE IN  
EFFECT FOR THE GREATER SEATTLE REGION FOR 6+ INCHES OF SNOW IN  
SOME LOCATIONS.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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