899  
FXUS01 KWBC 221959  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
358 PM EDT TUE MAY 22 2018  
 
VALID 00Z WED MAY 23 2018 - 00Z FRI MAY 25 2018  
 
...SCATTERED STORMS WILL CONTINUE ACROSS THE DEEP SOUTH THROUGH  
THE MIDDLE OF THE WEEK...  
 
...SHOWERS AND THUNDERSTORMS, WITH LOCALLY HEAVY RAIN POSSIBLE,  
SHOULD DEVELOP NEAR A WARM FRONT AS IT LIFTS THROUGH THE  
CENTRAL/NORTHERN PLAINS AND MISSISSIPPI VALLEY...  
 
SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS MUCH OF  
THE EASTERN U.S. AS ANOMALOUS MOISTURE STREAMS NORTHWARD FROM THE  
TROPICS AND INTERACTS WITH A COLD FRONT MOVING THROUGH THE  
NORTHEAST. SOME OF THE STORMS MAY CONTAIN LOCALLY HEAVY RAINFALL  
AND SEVERE WEATHER. SPC HAS PARTS OF THE MID-ATLANTIC AND THE OHIO  
VALLEY IN A SLIGHT RISK FOR THIS AFTERNOON AND EVENING, SO CHECK  
THOSE PRODUCTS FOR MORE INFORMATION. RAIN SHOULD EXIT THE  
MID-ATLANTIC AND THE NORTHEAST BY WEDNESDAY MORNING FOLLOWING THE  
PASSAGE OF THE COLD FRONT BUT SHOWERS AND STORMS MAY PERSIST  
THROUGH MID-WEEK ACROSS THE DEEP SOUTH AND BACK INTO THE LOWER  
MISSISSIPPI VALLEY AS THE SOUTHERN PORTION OF THE COLD FRONT DROPS  
SLOWLY SOUTHWARD THROUGH THE TENNESSEE VALLEY.  
 
EXPECT MAINLY DIURNALLY DRIVEN SHOWERS AND STORMS INTO WEDNESDAY  
ACROSS MUCH OF THE INTERMOUNTAIN WEST UNDERNEATH BROAD TROUGHING  
IN THE UPPER LEVELS. A WAVE OF ENERGY ALOFT, COMBINED WITH A  
SURFACE LOW/WARM FRONT AND ABUNDANT MOISTURE WILL HELP TRIGGER  
STORMS AHEAD OF THE WARM FRONT AS IT LIFTS THROUGH THE  
CENTRAL/NORTHERN PLAINS AND INTO THE MISSISSIPPI VALLEY TONIGHT  
AND INTO WEDNESDAY. SOME STORMS MAY CONTAIN HEAVY RAINFALL,  
ESPECIALLY NEAR THE SURFACE LOW ITSELF AND ALONG THE FRONTAL  
BOUNDARY. A MARGINAL TO SLIGHT RISK FOR EXCESSIVE RAINFALL/FLASH  
FLOODING IS BEING MONITORED ACROSS MUCH OF THE REGION TODAY.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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