847  
FXUS01 KWBC 181846  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
146 PM EST THU JAN 18 2018  
 
VALID 00Z FRI JAN 19 2018 - 00Z SUN JAN 21 2018  
 
...COLDER TEMPERATURES AND UNSETTLED WEATHER RETURNING TO THE  
WEST...  
 
...DRY CONDITIONS AND WARMER TEMPERATURES EXTENDING FROM THE GREAT  
PLAINS TO THE EAST...  
 
THE LATTER HALF OF THE WEEK IS EXPECTED TO MARK THE ONSET OF A  
PATTERN CHANGE ACROSS THE CONTIGUOUS U.S. -- WITH UNSETTLED  
WEATHER AND COLDER TEMPERATURES RETURNING TO THE WESTERN U.S.,  
WHILE DRY CONDITIONS AND WARMER TEMPERATURES SPREAD FROM THE  
CENTRAL TO THE EASTERN U.S.  
 
IN THE WEST, A WELL-DEFINED COLD FRONT EXTENDING FROM THE NORTHERN  
ROCKIES BACK THROUGH NORTHERN CALIFORNIA IS FORECAST TO PUSH  
SOUTHEAST DURING THE PERIOD, REACHING THE CENTRAL ROCKIES AND  
SOUTHWESTERN U.S. BY THE EARLY PART OF THE WEEKEND. IN ADDITION  
TO COLDER TEMPERATURES, THIS FRONT IS EXPECTED TO BRING WIDESPREAD  
PRECIPITATION, INCLUDING MOUNTAIN SNOWS TO THE NORTHERN ROCKIES,  
NORTHERN GREAT BASIN AS WELL AS NORTHERN CALIFORNIA THURSDAY NIGHT  
INTO FRIDAY. LATE FRIDAY INTO SATURDAY, PRECIPITATION IS EXPECTED  
TO SHIFT FURTHER SOUTHEAST INTO THE FOUR CORNERS REGION, AS WELL  
AS THE CENTRAL AND SOUTHERN ROCKIES. ACROSS THE NORTHWEST, AN  
AREA OF LOW PRESSURE LINGERING NORTH OF VANCOUVER ISLAND WILL  
CONTINUE TO SUPPORT UNSETTLED WEATHER ACROSS THE THE PACIFIC  
NORTHWEST THROUGH FRIDAY. THIS WILL BE FOLLOWED BY ANOTHER  
FRONTAL SYSTEM WHICH WILL APPROACH THE COAST, BRINGING ADDITIONAL  
WET WEATHER TO THE REGION ON SATURDAY.  
 
FURTHER EAST, HIGH PRESSURE CURRENTLY CENTERED OVER THE LOWER  
MISSISSIPPI VALLEY IS FORECAST TO SHIFT FURTHER EAST -- ALLOWING  
WARMER AIR TO SPREAD EAST FROM THE GREAT PLAINS INTO THE EASTERN  
U.S. BY SATURDAY, SEASONAL TO ABOVE AVERAGE TEMPERATURES ARE  
EXPECTED TO PREVAIL ACROSS MUCH OF THE EASTERN TWO-THIRDS OF THE  
CONTIGUOUS U.S., MARKING A STARK CONTRAST TO TEMPERATURES OBSERVED  
EARLIER IN THE WEEK.  
 
PEREIRA  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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