855  
FXUS01 KWBC 150755  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
254 AM EST TUE JAN 15 2019  
 
VALID 12Z TUE JAN 15 2019 - 12Z THU JAN 17 2019  
 
...HEAVY PRECIPITATION RETURNS TO CALIFORNIA AND ARCTIC AIR SURGES  
SOUTH ACROSS THE NORTHERN PLAINS...  
 
A VERY ACTIVE WEATHER PATTERN WILL BE IN PLACE ACROSS CALIFORNIA  
AND THEN THE INTERMOUNTAIN WEST THROUGH THE MIDDLE OF THE WORK  
WEEK. A DEEP PACIFIC TROUGH OFF THE WEST COAST WILL REMAIN IN  
PLACE OVER THE NEXT FEW DAYS WITH A FRONTAL BOUNDARY APPROACHING  
CENTRAL CALIFORNIA TUESDAY EVENING, AND A MUCH STRONGER STORM  
ARRIVES WEDNESDAY NIGHT. THE RESULT WILL BE WIDESPREAD RAIN WITH  
ENHANCED RAINFALL FOR THE COASTAL MOUNTAIN RANGES, AND WPC HAS A  
MODERATE RISK OF FLASH FLOODING ACROSS THE MOUNTAINOUS TERRAIN  
NEAR LOS ANGELES FOR TUESDAY. HEAVY SNOW WILL FALL ACROSS THE  
SIERRA NEVADA AND SISKIYOU MOUNTAINS OF CALIFORNIA, WITH AMOUNTS  
EXCEEDING A FOOT AT THE HIGHEST ELEVATIONS.  
 
ELSEWHERE ACROSS THE CONTINENTAL U.S., A STRONG COLD FRONT DROPS  
SOUTHWARD ACROSS THE PLAINS ON TUESDAY AND INTO EARLY WEDNESDAY,  
BRINGING FRIGID TEMPERATURES TO THE DAKOTAS AND THE UPPER MIDWEST  
BY THE MIDDLE PART OF THE WEEK. THERE SHOULD BE ENOUGH MOISTURE  
WITH THIS FRONT TO PRODUCE SOME MIXED PRECIPITATION OVER THE LOWER  
GREAT LAKES AND SNOW SHOWERS BEHIND THE FRONT OVER NORTHERN  
MICHIGAN.  
 
WITH A LARGE SURFACE HIGH OVER THE GULF COAST REGION, RETURN FLOW  
FROM THE GULF OF MEXICO WILL BEGIN TO BRING INCREASING MOISTURE  
THROUGH EASTERN TEXAS AND INTO THE CENTRAL PLAINS, WHERE SOME  
SHOWERS ARE LIKELY ON WEDNESDAY. IN ADDITION, THE NORTHERN EXTENT  
OF THE MOISTURE COULD RESULT IN SOME WINTRY PRECIPITATION ACROSS  
THE NORTH-CENTRAL PLAINS ON WEDNESDAY AS WELL.  
 
D. HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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