508  
FXUS01 KWBC 180715  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
215 AM EST THU JAN 18 2018  
 
VALID 12Z THU JAN 18 2018 - 12Z SAT JAN 20 2018  
 
...AFTER A COLD START ACROSS THE DEEP SOUTH, WARMER WEATHER WILL  
SPREAD EASTWARD FROM THE PLAINS AS THE WEEKEND APPROACHES...  
 
...COOLER AND UNSETTLED WEATHER FOR THE WESTERN U.S. THROUGH  
SATURDAY MORNING.  
 
AFTER THURSDAY MORNING LOWS IN THE TEENS FOR MANY LOCATIONS  
EXTENDING FROM EASTERN TEXAS TO THE CENTRAL GULF COAST, WARMER  
WEATHER IS ON THE WAY. HIGH PRESSURE CURRENTLY SITUATED OVER THE  
LOWER MISSISSIPPI RIVER VALLEY WILL SLOWLY SHIFT EAST OVER THE  
NEXT TWO DAYS, ALLOWING A SOUTHWESTERLY WIND TO BRING IN WARMER  
AIR FROM THE PLAINS AND GULF OF MEXICO. HIGHS ACROSS THE DEEP  
SOUTH WILL STILL BE 10 TO 20 DEGREES BELOW AVERAGE TODAY, BUT ARE  
EXPECTED TO BE NEAR TO ABOVE AVERAGE FOR SATURDAY. FOR SATURDAY,  
HIGH TEMPERATURES IN OKLAHOMA, TEXAS AND LOUISIANA SHOULD WARM UP  
INTO THE 60S AND 70S, A SIGNIFICANT CHANGE FROM THE SNOW AND ICE  
EXPERIENCED EARLIER IN THE WEEK.  
 
AFTER THE DEPARTURE OF A WINTER STORM FROM THE MID-ATLANTIC COAST  
THIS MORNING, MOST LOCATIONS EAST OF THE ROCKIES WILL BE DRY  
THROUGH SATURDAY MORNING, EXCEPT FOR LIGHT SNOW IN THE VICINITY OF  
THE GREAT LAKES AND SOME SHOWERS OVER THE EASTERN HALF OF TEXAS  
INTO LOUISIANA ON FRIDAY AND SATURDAY.  
 
OUT WEST, A CHANGE IN THE UPPER PATTERN WILL ALLOW FOR THE  
INFILTRATION OF COLDER, PACIFIC AIR ALONG WITH RAIN AND HIGHER  
ELEVATION SNOW DEVELOPING THROUGH THE REST OF THE WEEK. RAIN  
ASSOCIATED WITH A COLD FRONT WILL CONTINUE TO MOVE INLAND TODAY,  
BUT AS COLDER AIR FLOWS IN BEHIND THE COLD FRONT, A RAIN/SNOW MIX  
IS EXPECTED TO DEVELOP ACROSS SOME OF THE HIGHER ELEVATIONS OF  
CALIFORNIA, OREGON AND IDAHO. BY SATURDAY MORNING, MANY INLAND  
LOCATIONS WILL BE SNOWING WITH RAIN LIMITED TO INLAND VALLEYS AND  
COASTAL LOCATIONS ALONG THE WEST COAST. SOME MORE SIGNIFICANT  
SNOWFALL ACCUMULATIONS ARE POSSIBLE FOR PORTIONS OF NEVADA INTO  
UTAH BEGINNING FRIDAY AND LASTING INTO SATURDAY, WITH WINTER STORM  
WATCHES ALREADY IN PLACE OVER PARTS OF NORTHEASTERN NEVADA.  
NEEDLESS TO SAY, TEMPERATURES WILL BE FALLING BELOW AVERAGE WEST  
OF THE ROCKIES BY SATURDAY.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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