899  
FXUS01 KWBC 131951  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
349 PM EDT WED MAR 13 2019  
 
VALID 00Z THU MAR 14 2019 - 00Z SAT MAR 16 2019  
 
...MAJOR WINTER STORM IS ONGOING ACROSS THE ROCKIES AND SPREADING  
INTO THE PLAINS...  
 
...SEVERE WEATHER AND FLASH FLOODING POSSIBLE IN THE LOWER  
MISSISSIPPI VALLEY THROUGH WEDNESDAY NIGHT...  
 
...HIGH WINDS ARE ANOTHER THREAT WITH THIS STORM SYSTEM,  
PARTICULARLY IN THE HIGH PLAINS...  
 
...COOLER THAN AVERAGE IN THE WEST BEHIND THE STORM AND WARMER  
THAN AVERAGE IN THE EAST AHEAD OF IT...  
 
A DEEP SURFACE LOW IN THE CENTRAL ROCKIES HAS RAPIDLY INTENSIFIED  
IN ASSOCIATION WITH A STRONG MID- TO UPPER-LEVEL LOW. ON THE  
BACKSIDE OF THE SURFACE LOW TO THE WEST AND NORTH, HEAVY SNOW IS  
LIKELY TO CONTINUE ACROSS THE CENTRAL/NORTHERN PLAINS. A SWATH OF  
6 TO 12 INCHES OF SNOW IS LIKELY FROM WEDNESDAY EVENING THROUGH  
THURSDAY PARTICULARLY IN CENTRAL PORTIONS OF THE DAKOTAS.  
WIDESPREAD BLIZZARD CONDITIONS ARE LIKELY IN THE CENTRAL AND  
NORTHERN HIGH PLAINS AS HIGH WINDS ARE A MAJOR THREAT THERE, WHICH  
WILL CREATE BLOWING AND DRIFTING SNOW AND VERY LOW VISIBILITIES.  
EXTREMELY DANGEROUS TRAVEL AND POWER OUTAGES ARE EXPECTED.  
 
ALONG AND EAST OF THE COLD FRONT ASSOCIATED THE LOW, RAIN AND  
THUNDERSTORMS ARE EXPECTED. THROUGH WEDNESDAY NIGHT, SEVERE  
THUNDERSTORMS AND FLASH FLOODING ARE FORECAST IN THE LOWER  
MISSISSIPPI VALLEY--SLIGHT RISKS OF SEVERE WEATHER AND EXCESSIVE  
RAINFALL ARE IN PLACE FROM THE STORM PREDICTION CENTER AND HERE AT  
THE WEATHER PREDICTION CENTER, RESPECTIVELY. ON THURSDAY, THE  
THUNDERSTORM THREAT WILL MOVE EASTWARD INTO THE OHIO AND TENNESSEE  
VALLEYS, AND ADDITIONAL SEVERE WEATHER IS POSSIBLE ALONG WITH  
LOCALLY HEAVY RAIN AND ISOLATED FLASH FLOODING. ADDITIONALLY,  
FLOODING IS POSSIBLE IN THE UPPER/MIDDLE MISSISSIPPI VALLEY, WHERE  
RAIN FALLING ON A DEEP SNOWPACK COULD CAUSE RAPID MELTING.  
 
BEHIND THE COLD FRONT, HIGH WINDS ARE ONGOING IN ASSOCIATION WITH  
THE TIGHT PRESSURE GRADIENT FROM THE DEEP SURFACE LOW. HIGH WIND  
WARNINGS ARE WIDESPREAD THROUGHOUT PARTS OF THE SOUTHERN AND  
CENTRAL PLAINS, AND WIND ADVISORIES ARE IN PLACE THROUGHOUT THE  
INTERMOUNTAIN WEST AND SOUTHWEST, AND FARTHER EAST THROUGH THE  
MISSISSIPPI VALLEY AND PARTS OF THE OHIO VALLEY.  
 
COLDER THAN AVERAGE TEMPERATURES WILL SPREAD FROM THE WESTERN HALF  
OF THE U.S. INTO THE CENTRAL U.S. AS THE STORM SYSTEM MOVES  
EASTWARD. AHEAD OF IT, WARM TEMPERATURES ARE FORECAST FOR THE  
EASTERN HALF OF THE U.S. ON THURSDAY, WITH HIGH TEMPERATURES 15 TO  
25 DEGREES ABOVE AVERAGE IN THE OHIO VALLEY AND GREAT LAKES  
REGION. MANY RECORD WARM MINIMUM TEMPERATURES ARE FORECAST TO BE  
SET ALONG THE EASTERN SEABOARD FRIDAY MORNING. IN THE WEST ON THE  
OTHER HAND, HIGH TEMPERATURES OF 15 TO 30 DEGREES BELOW AVERAGE IN  
THE ROCKIES AND HIGH PLAINS THROUGH THE END OF THE WORKWEEK.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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