901  
FXUS02 KWBC 140453  
PMDEPD  
 
EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
1152 PM EST TUE FEB 13 2018  
 
VALID 12Z SAT FEB 17 2018 - 12Z WED FEB 21 2018  
 
...AMPLIFIED PATTERN NEXT WEEK -- COLD TEMPERATURES FOR THE WEST  
AND MILD FOR THE EAST...  
 
ENSEMBLES CONTINUE TO POINT TO AN INCREASINGLY AMPLIFIED PATTERN  
NEXT WEEK WITH A DEEP WESTERN TROUGH AND A STRONG EASTERN RIDGE. A  
MULTI-MODEL/ENSEMBLE CONSENSUS OF THE RECENT GFS/ECMWF RUNS  
OFFERED A GOOD STARTING POINT. AFTER A SNEAKY WINTER WEATHER  
THREAT FOR THE MID-ATLANTIC INTO THE NORTHEAST EARLY IN THE PERIOD  
(SAT NIGHT INTO EARLY SUNDAY), TEMPERATURES WILL RISE WELL INTO  
THE 60S/70S IN THE EAST AS AN APPROACHING COLD FRONT SLOWS DOWN  
ACROSS THE MIDDLE MISSISSIPPI VALLEY AND BECOMES THE FOCUS FOR  
SOME LOCALLY MODEST TO HEAVY RAIN NEXT TUE/WED. FARTHER WEST,  
LOWERING HEIGHTS WILL TAKE THE SNOW LEVEL DOWN TO 1000-2000 FT AND  
BRING IN MUCH COLDER AIR TO MONTANA (ABOUT 20-30 DEGREES BELOW  
AVERAGE). MODEST SNOW IS EXPECTED FOR MIDDLE AND HIGHER ELEVATIONS  
THIS WEEKEND IN WA/OR/ID/MT/WY THAT WILL MOVE SOUTHWARD THROUGH  
THE GREAT BASIN AND INTERIOR WEST INTO THE SOUTHWEST NEXT WEEK,  
WITH SOME LIGHTER SNOW SLIPPING EASTWARD ON THE NORTHERN SIDE OF  
THE PRECIPITATION SHIELD FARTHER EAST.  
 
FRACASSO  
 

 
 
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