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
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