881  
FXUS01 KWBC 180659  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
258 AM EDT THU APR 18 2019  
 
VALID 12Z THU APR 18 2019 - 12Z SAT APR 20 2019  
 
...RISK OF SEVERE THUNDERSTORMS AND FLASH FLOODING FROM THE GULF  
COAST TO THE OHIO RIVER VALLEY TODAY, SHIFTING TO THE EAST COAST  
ON FRIDAY...  
 
...WARMER AND GENERALLY DRY OVER THE WEST, WITH THE NEXT ROUND OF  
PRECIPITATION ARRIVING IN THE NORTHWEST ON FRIDAY...  
 
A LOW PRESSURE SYSTEM WILL MOVE EAST FROM THE MISSISSIPPI RIVER  
VALLEY TODAY, TO THE EAST COAST BY FRIDAY NIGHT. THIS WILL DELIVER  
WIDESPREAD RAIN TO MUCH OF THE EASTERN HALF OF THE U.S. OVER THE  
NEXT COUPLE DAYS WITH MANY LOCATIONS LIKELY TO RECEIVE OVER AN  
INCH OF RAINFALL. THE PRIMARY SURFACE LOW WILL SHIFT FROM THE MID  
SOUTH, NEAR ARKANSAS, TODAY TO THE CENTRAL APPALACHIANS LATER ON  
FRIDAY. A TRAILING COLD FRONT WILL SWEEP ACROSS MUCH OF THE GULF  
COAST AND SOUTHEAST. AHEAD OF THE LOW AND ASSOCIATED COLD FRONT, A  
WARM, HUMID AIR MASS WILL PUSH WELL INLAND, SUPPORTING THE  
DEVELOPMENT OF THUNDERSTORMS AS FAR NORTH AS THE GREAT LAKES AND  
MID ATLANTIC.  
 
SOME OF THE THUNDERSTORMS WILL BE SEVERE. THE GREATEST RISK OF  
SEVERE WEATHER IS IN THE GULF COAST STATES TODAY, AND IN THE  
SOUTHEAST ATLANTIC COAST STATES FROM VIRGINIA TO FLORIDA ON  
FRIDAY. THE MAIN THREATS WITH THE SEVERE STORMS WILL BE DAMAGING  
WIND GUSTS AND SEVERAL TORNADOES; SOME OF THE TORNADOES IN THE  
SOUTH TODAY AND TONIGHT COULD BE STRONG. FOR MORE DETAILED  
INFORMATION ON THE SEVERE WEATHER THREAT, REFER TO STORM  
PREDICTION CENTER FORECASTS.  
 
THE THUNDERSTORMS AND AREAS OF HEAVY RAIN WILL ALSO POSE A RISK  
FOR FLASH FLOODING OVER MUCH OF THE EASTERN HALF OF THE U.S. IN  
THE NEXT COUPLE DAYS, GRADUALLY SHIFTING EAST WITH THE LOW  
PRESSURE SYSTEM. FLASH FLOODING WILL BE MOST LIKELY TODAY IN THE  
LOWER AND MIDDLE MISSISSIPPI RIVER VALLEY; SOME LOCATIONS COULD  
RECEIVE SEVERAL INCHES OF RAIN IN A FEW HOURS. THE RISK OF FLASH  
FLOODING ON FRIDAY SHOULD EXTEND ALONG MOST OF THE U.S. EAST  
COAST, FROM THE NORTHERN BORDER WITH CANADA SOUTH TO GEORGIA.  
 
MEANWHILE, ACROSS THE WEST, TODAY SHOULD BE RELATIVELY WARM AND  
DRY WITH THE WARMTH CONTINUING INTO FRIDAY IN MOST AREAS.  
TEMPERATURES WILL BE 10 TO 20 DEGREES ON A WIDESPREAD BASIS. THE  
NEXT FRONT WILL BEGIN TO ARRIVE IN THE NORTHWEST TONIGHT AND  
FRIDAY, WITH INCREASING CHANCES OF PRECIPITATION. FAIRLY HIGH SNOW  
LEVELS WILL GENERALLY PREVENT SNOW OTHER THAN IN THE HIGHEST  
ELEVATIONS BEHIND THE COLD FRONT.  
 
LAMERS  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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