476  
FXUS01 KWBC 311815  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
115 PM EST WED JAN 31 2018  
 
VALID 00Z THU FEB 01 2018 - 00Z SAT FEB 03 2018  
 
...A RETURN TO MUCH COLDER WEATHER IN STORE FOR THE  
CENTRAL/EASTERN U.S...  
   
..WET CONDITIONS TO REMAIN OVER THE PACIFIC NORTHWEST
 
 
...SNOWFALL ACCUMULATIONS LIKELY OVER THE GREAT LAKES AND INTO THE  
CENTRAL/NORTHERN APPALACHIANS...  
 
A DEEP UPPER TROUGH SWEEPING THROUGH THE CENTER OF THE COUNTRY AND  
TO POINTS EASTWARD WILL FAVOR WELL BELOW AVERAGE TEMPERATURES  
THROUGHOUT THE PERIOD. FORECAST ANOMALIES SHOULD BE AROUND 15 TO  
20 DEGREES BELOW CLIMATOLOGY, PARTICULARLY FROM THE NORTHERN HIGH  
PLAINS EASTWARD INTO THE UPPER GREAT LAKES. ON THURSDAY, EXPECTED  
HIGH TEMPERATURES SHOULD STRUGGLE TO ESCAPE THE SINGLE DIGITS WITH  
SOME BELOW ZERO READINGS POSSIBLE OVER NORTHERN MINNESOTA. AS THE  
ARCTIC BOUNDARY SLIDES SOUTH AND EAST, EXPECT THIS FRIGID WEATHER  
TO FOLLOW SUIT WITH BELOW FREEZING OVERNIGHT LOWS LIKELY DOWN  
TOWARD THE RED RIVER AND THE MID-SOUTH ON FRIDAY MORNING. WHILE  
LOCATIONS EAST OF THE ROCKIES REMAIN ON THE CHILLY SIDE, GENERAL  
RIDGING ACROSS THE SOUTHWESTERN STATES WILL FAVOR READINGS AROUND  
10 TO 15 DEGREES ABOVE AVERAGE. LOW 80S SHOULD BE NUMEROUS ACROSS  
THE DESERT SOUTHWEST THE NEXT COUPLE OF DAYS.  
 
THE MOST ACTIVE WEATHER IN THE COUNTRY SHOULD REMAIN ACROSS THE  
PACIFIC NORTHWEST AND INTO THE UPPER INTERMOUNTAIN WEST. A  
TRANSITORY PATTERN WILL ALLOW AN UPPER RIDGE TO BRIEFLY BUILD  
OVERHEAD BEFORE GIVING WAY TO A QUICK MOVING DISTURBANCE. IN  
ADVANCE OF THIS SYSTEM, EXPECT AN INCREASE IN THE COVERAGE OF  
PRECIPITATION OVER THE NORTHWESTERN STATES, PARTICULARLY ACROSS  
THE OLYMPICS AND WASHINGTON CASCADES GIVEN OROGRAPHIC EFFECTS.  
ACCUMULATING SNOWS SHOULD BE FAVORED OVER THE HIGHER ELEVATIONS  
WITH OVER A FOOT EXPECTED OVER THE LATTER RANGES. ADDITIONAL SNOW  
IS IN THE FORECAST ACROSS SOME OF THE INTERIOR MOUNTAIN RANGES  
INCLUDING THE BITTERROOTS, SAWTOOTH, AND TETONS.  
 
IN ADVANCE OF THE MENTIONED ARCTIC BOUNDARY SURGING THROUGH THE  
MIDDLE OF THE COUNTRY, LIGHT TO MODERATE RAINFALL SHOULD BREAK OUT  
FROM THE WESTERN GULF COAST UP ACROSS THE EASTERN THIRD OF THE  
COUNTRY. EXPECT ANYWHERE FROM A QUARTER TO HALF INCH OF RAIN OVER  
SECTIONS OF THE TENNESSEE VALLEY INTO THE CENTRAL APPALACHIANS.  
WITHIN AREAS OF COLDER TEMPERATURES, SOME ACCUMULATING SNOWS ARE  
POSSIBLE OVER THE GREAT LAKES AND INTO THE HIGHER TERRAIN OF THE  
CENTRAL/NORTHERN APPALACHIANS AND THE INTERIOR NORTHEAST.  
 
RUBIN-OSTER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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