519  
FXUS01 KWBC 210758  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
257 AM EST SUN JAN 21 2018  
 
VALID 12Z SUN JAN 21 2018 - 12Z TUE JAN 23 2018  
 
...HEAVY SNOW AND FREEZING RAIN POSSIBLE FROM THE CENTRAL PLAINS  
TO THE UPPER MIDWEST, GREAT LAKES AND NEW ENGLAND...  
   
..HEAVY SNOW POSSIBLE OVER THE CASCADES AND THE ROCKIES
 
 
...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST AND  
NORTHERN CALIFORNIA...  
 
A FRONT PASSING THROUGH THE CENTRAL AND SOUTHERN ROCKIES TODAY  
WILL QUICKLY DEVELOP INTO A ROBUST WINTER STORM SYSTEM  
TONIGHT/EARLY MONDAY AS IT MOVES OUT INTO THE CENTRAL AND SOUTHERN  
PLAINS. WARM, GULF MOISTURE DRAWN NORTHWARD INTO THIS SYSTEM WILL  
HELP PRODUCE WIDESPREAD SNOW FROM THE NORTHERN/CENTRAL ROCKIES TO  
THE UPPER MISSISSIPPI VALLEY AND EAST TO THE GREAT LAKES REGION  
AND NEW ENGLAND BY TUESDAY. SNOW WILL LIKELY BE HEAVY AT TIMES,  
ESPECIALLY ALONG A SWATH FROM NEBRASKA TO WISCONSIN. ALONG AND  
NEAR THE FRONT ITSELF, A RELATIVELY NARROW BAND OF FREEZING RAIN  
IS EXPECTED TO DEVELOP. BOTH TYPES OF PRECIPITATION WILL LIKELY  
HAVE A SIGNIFICANT IMPACT TO TRANSPORTATION THROUGH AT LEAST  
TUESDAY. MUCH OF WYOMING, COLORADO, NORTHWEST KANSAS, NEBRASKA,  
SOUTHERN SOUTH DAKOTA, IOWA, SOUTHERN MINNESOTA AND NORTHERN  
WISCONSIN HAVE WINTER WEATHER ADVISORIES, WINTER STORM WARNINGS OR  
WINTER STORM WATCHES IN EFFECT.  
 
SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG AND AHEAD OF THE  
TRAILING COLD FRONT AS IT MOVES EASTWARD THROUGH THE CENTRAL U.S.  
PERIODS OF HEAVY RAIN WILL BE POSSIBLE ACROSS THE SOUTH,  
ESPECIALLY NEAR THE OZARKS OF ARKANSAS AND MISSOURI. THE RISK FOR  
FLASH FLOODING MAY BECOME ELEVATED IN THAT REGION THROUGH MONDAY  
MORNING. RAIN WILL SPREAD TO THE EASTERN TENNESSEE AND OHIO  
VALLEYS AND THE MID-ATLANTIC MONDAY AND TUESDAY.  
 
THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA WILL REMAIN IN AN  
INCREASINGLY WET PATTERN OVER THE NEXT FEW DAYS AS UPPER-LEVEL  
ENERGY MOVES INLAND. RAIN AND HIGHER ELEVATION SNOW WILL SPREAD  
FROM MUCH OF THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA TO THE  
NORTHERN ROCKIES TODAY- EXPANDING INTO PARTS OF THE GREAT BASIN BY  
MONDAY. HEAVY SNOW IS FORECAST FOR THE CASCADES, AS WELL AS,  
PORTIONS OF THE NORTHERN AND CENTRAL ROCKIES. WINTER STORM  
WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT FROM  
NORTH-CENTRAL WASHINGTON TO NORTHERN CALIFORNIA.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab HPC Page Main Text Page