267  
FXUS01 KWBC 070734  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
234 AM EST THU FEB 07 2019  
 
VALID 12Z THU FEB 07 2019 - 12Z SAT FEB 09 2019  
 
...A DEEPENING WINTER STORM WILL PRODUCE WIDESPREAD HEAVY SNOWS  
FROM EASTERN PORTIONS OF THE NORTHERN PLAINS...ACROSS THE UPPER  
MISSISSIPPI VALLEY AND INTO THE UPPER GREAT LAKES AND ACCUMULATING  
FREEZING RAIN ACROSS THE LOWER GREAT LAKES INTO NORTHERN NEW  
ENGLAND...  
 
...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...  
 
...ANOTHER SURGE OF ARCTIC AIR POISED TO PUSH SOUTH INTO THE  
NORTHERN PLAINS...NORTHERN ROCKIES AND PORTIONS OF THE PACIFIC  
NORTHWEST THIS WEEKEND. LOW ELEVATION ACCUMULATING SNOWS POSSIBLE  
FOR THE PACIFIC NORTHWEST AT THIS TIME...  
 
AN AREA OF LOW PRESSURE IS EXPECTED TO CONTINUE TO DEEPEN THURSDAY  
ALONG THE STRONG ARCTIC FRONT STRETCHING FROM THE SOUTHERN PLAINS  
INTO THE MID MISSISSIPPI VALLEY. THIS LOW WILL BE PUSHING  
NORTHEASTWARD INTO THE GREAT LAKES REGION BY THURSDAY EVENING AND  
INTO EASTERN CANADA FRIDAY...SUPPORTING HEAVY SNOWS FROM THE UPPER  
MISSISSIPPI VALLEY INTO THE UPPER LAKES AND ACCUMULATING FREEZING  
RAIN FROM THE LOWER GREAT LAKES INTO NORTHERN NEW ENGLAND.  
BLIZZARD CONDITIONS POSSIBLE TODAY ON THE NORTHWEST PORTION OF  
THIS STORM FROM EASTERN PORTIONS OF NORTH DAKOTA...NORTHEAST SOUTH  
DAKOTA INTO WESTERN MINNESOTA. BLIZZARD WARNINGS ARE CURRENTLY IN  
EFFECT ACROSS THESE AREAS FOR THE DAY ON THURSDAY.  
 
IN THE WAKE OF THE DEEPENING LOW MOVING INTO THE GREAT  
LAKES/EASTERN CANADA...THE TRAILING ARCTIC FRONT WILL BE PUSHING  
EAST FROM THE SOUTHERN PLAINS INTO THE LOWER TO MID MISSISSIPPI  
VALLEY AND OHIO VALLEY THURSDAY AND THROUGH THE EASTERN SEABOARD  
ON FRIDAY. THIS FRONT WILL BRING MUCH COLDER AIR ACROSS THESE  
REGIONS OVER THE NEXT 2 DAYS...REPLACING THE RECENT MUCH ABOVE  
AVERAGE TEMPERATURES WITH BELOW AVERAGE TEMPERATURES. HIGH  
TEMPERATURES WILL BE 25 TO 40 DEGREES COLDER FRIDAY THAN THURSDAY  
ACROSS THE SOUTHERN PLAINS...LOWER TO MID MISSISSIPPI VALLEY AND  
OHIO VALLEY AND 20 TO 25 DEGREES COLDER SATURDAY THAN FRIDAY ALONG  
THE EAST COAST.  
 
THE COLDEST TEMPERATURES OVER THE NEXT FEW DAYS WILL BE ACROSS THE  
NORTHERN PLAINS WHERE HIGHS WILL STAY BELOW ZERO INTO THIS  
WEEKEND. A SECONDARY SURGE OF ARCTIC AIR WILL BE PUSHING INTO THE  
NORTHERN PLAINS...NORTHERN ROCKIES AND PORTIONS OF THE PACIFIC  
NORTHWEST LATE FRIDAY INTO SUNDAY.  
 
THE LARGE SCALE FLOW PATTERN SUPPORTING THE SECONDARY ARCTIC SURGE  
INTO THE NORTHERN PLAINS WILL ALSO SUPPORT HEAVY SNOW POTENTIAL  
INTO THE PACIFIC NORTHWEST LATE FRIDAY INTO SATURDAY. SNOW LEVELS  
WILL BE FALLING AS A STRONG MID TO UPPER LEVEL CLOSED LOW  
STRENGTHENS ALONG THE B.C./WASHINGTON STATE COASTAL AREA. THIS  
WILL SUPPORT ACCUMULATING SNOW POTENTIAL AT LOWER ELEVATIONS LATE  
FRIDAY INTO SATURDAY ACROSS THE PACIFIC NORTHWEST.  
 
ORAVEC  
 
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