207  
FXUS01 KWBC 190800  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
259 AM EST MON FEB 19 2018  
 
VALID 12Z MON FEB 19 2018 - 12Z WED FEB 21 2018  
 
...HEAVY SNOW OVER THE NORTHERN PLAINS INTO THE CENTRAL ROCKIES  
AND THE UPPER GREAT LAKES...  
 
...HEAVY RAIN AND FLOODING POSSIBLE FOR PORTIONS OF THE MIDWEST  
MONDAY AND LIKELY FOR SOUTHERN PLAINS AND MID-MISSISSIPPI VALLEY  
ON TUESDAY...  
 
...RAIN/FREEZING RAIN POSSIBLE FROM OF THE MIDDLE/UPPER  
MISSISSIPPI VALLEY TO THE UPPER GREAT LAKES AND NORTHERN MAINE...  
 
...TEMPERATURES WILL PLUMMET ACROSS THE NORTHERN ROCKIES AND THE  
ADJACENT NORTHERN AND CENTRAL PLAINS, AVERAGING 15 TO 40 DEGREES  
BELOW SEASONAL AVERAGE...  
 
WIDESPREAD SNOW WILL PERSIST THROUGH LATE TUESDAY ACROSS PORTIONS  
OF THE WASATCHS, CENTRAL/NORTHERN ROCKIES AND INTO THE HIGH PLAINS  
AS A STRONG COLD FRONT SOUTHWARD THROUGH THE ROCKIES AND INTO THE  
CENTRAL U.S. ACCUMULATIONS WILL BE HEAVY AT TIMES, ESPECIALLY FOR  
THE CENTRAL ROCKIES. ARCTIC AIR WILL CONTINUE TO SPILL INTO THE  
NORTHERN STATES ALLOWING A SIGNIFICANT DROP IN TEMPERATURES OVER  
THE NEXT COUPLE DAYS. ANOTHER COLD FRONT DROPPING SOUTH FROM  
CANADA WILL REINFORCE SNOW GENERATION ACROSS THE NORTHERN PLAINS  
AND PORTIONS OF THE UPPER GREAT LAKES. A VAST AREA FROM COASTAL  
OREGON/NORTHERN CALIFORNIA TO UPPER MICHIGAN HAVE WINTER STORM  
WARNINGS AND WINTER WEATHER ADVISORIES.  
 
THE FRONT'S PROGRESSION THROUGH THE CENTRAL U.S. WILL BE FAIRLY  
SLOW OVER THE NEXT FEW DAYS WHICH WILL SET THE STAGE FOR A  
POTENTIALLY LONG DURATION WET PERIOD FOR PORTIONS OF THE  
SOUTHERN/CENTRAL PLAINS AND THE MISSISSIPPI VALLEY. A STEADY PLUME  
OF WARM GULF MOISTURE WILL TRANSPORT NORTHWARD ALONG THIS  
BOUNDARY. SCATTERED TO WIDESPREAD RAIN AND THUNDERSTORMS ARE  
FORECAST FROM TEXAS TO THE GREAT LAKES REGION. AN AXIS OF 2 TO 4  
INCHES IS FORECAST FROM EASTERN TEXAS TO LOWER MICHIGAN, WITH  
POCKETS OF 5+ INCHES OVER NORTHEAST TEXAS TO THE OZARKS.  
THUNDERSTORMS WILL HAVE LITTLE MOVEMENT AND/OR TRACK OVER THE SAME  
AREA; WHICH WILL GREATLY INCREASE THE LIKELIHOOD OF FLOODING  
CONDITIONS. A MODERATE RISK FOR EXCESSIVE RAINFALL IS IN EFFECT  
FOR TUESDAY INTO WEDNESDAY.  
 
ADDITIONALLY ALONG THE RAIN/SNOW LINE, RAIN AND FREEZING RAIN WILL  
DEVELOP OVER PARTS OF THE CENTRAL PLAINS INTO PARTS OF THE UPPER  
GREAT LAKES MONDAY MORNING INTO TUESDAY.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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