720  
FXUS01 KWBC 221959  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
359 PM EDT SUN JUL 22 2018  
 
VALID 00Z MON JUL 23 2018 - 00Z WED JUL 25 2018  
 
...HEAVY RAIN AND FLASH FLOODING TO CONTINUE ACROSS THE  
MID-ATLANTIC AND NORTHEAST...  
 
...SEVERE WEATHER AND HEAVY RAIN WILL OCCUR ACROSS THE PLAINS AND  
INTO THE CENTRAL/SOUTHERN ROCKIES...  
 
...UNSETTLED WEATHER EXPECTED ACROSS THE CENTRAL AND EASTERN GULF  
OF MEXICO....  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHERN PLAINS AND  
PORTIONS OF THE WESTERN U.S...  
 
SEVERAL DAYS OF HEAVY RAINFALL ARE EXPECTED ACROSS THE MID  
ATLANTIC AND NORTHEAST. HEAVY RAIN WILL CONTINUE ACROSS THE  
COASTAL MID-ATLANTIC THIS EVENING AS A LOW PRESSURE SYSTEM THAT  
HAS BEEN TRAVERSING NORTHWARD UP THE MID-ATLANTIC COAST, FALLS  
APART WHILE MOVING INLAND THIS EVENING. PORTIONS OF THE COASTAL  
MID ATLANTIC ARE UNDER A MODERATE RISK OF EXCESSIVE RAINFALL AND  
FLASH FLOODING GIVEN THE ALREADY SATURATED SOILS FROM YESTERDAYS  
HEAVY RAINS THAT WENT THROUGH THE REGION.  
 
MEANWHILE, AN EXPANSIVE FRONTAL SYSTEM THAT PUSHED ACROSS MUCH OF  
THE SOUTHEAST OVER THE LAST 24 HOURS HAS NOW GENERALLY STALLED  
NEAR THE COASTAL AREAS, EXTENDING NORTHWARD INTO THE MID ATLANTIC.  
THIS IS ALSO ACTING AS THE FOCUS FOR SHOWERS AND THUNDERSTORMS  
ACROSS THESE REGIONS. MUCH OF FLORIDA AND SOUTHERN GEORGIA AND  
SOUTHERN MISSSIPPI REMAIN IN A SLIGHT RISK FOR SEVERE  
THUNDERSTORMS THIS EVENING AND OVERNIGHT. A SEVERE THUNDERSTORM  
WATCH HAS ALSO BEEN ISSUED BY THE STORM PREDICTION CENTER, VALID  
UNTIL 8PM EDT THIS EVENING. A SLIGHT RISK OF SEVERE THUNDERSTORMS  
WILL BE POSSIBLE ALONG SOUTHERN LOUISIANA AND SOUTHERN ALABAMA  
DURING THE DAY MONDAY AS THE FRONTAL SYSTEM REMAINS STALLED ALONG  
THE COAST. A STRONG SURGE OF EASTERLY FLOW ALONG THE ENTIRE  
ATLANTIC COAST OVER THE NEXT SEVERAL DAYS WILL RESULT IN CONTINUED  
RAIN ACROSS THIS REGION. EXCESSIVE RAINFALL AND FLASH FLOODING ARE  
LIKELY FOR THESE AREAS, AS HAS BEEN OUTLINED IN THE DAYS 2 AND  
DAYS 3 EXCESSIVE RAINFALL OUTLOOK ISSUED BY THE WEATHER PREDICTION  
CENTER.  
 
ANOTHER FRONTAL SYSTEM WILL SLIDE ACROSS THE NORTHERN HIGH PLAINS  
TODAY--FIRING OFF CONVECTION ALONG THE BOUNDARY. SEVERE  
THUNDERSTORMS WILL BE POSSIBLE PARTICULARLY FROM NORTH DAKOTA  
SOUTHWARD INTO WESTERN NEBRASKA--WHERE THE STORM PREDICTION CENTER  
HAS ISSUED A SLIGHT RISK. BY MONDAY, A PLUME OF MOISTURE WILL  
EXTEND INTO THE EASTERN HIGH PLAINS OF COLORADO AND NEW MEXICO  
WHERE FLASH FLOODING COULD OCCUR ALONG FAVORABLE TERRAIN.  
THUNDERSTORMS WILL ALSO IMPACT THE CENTRAL GREAT BASIN AND ALONG  
THE SIERRA NEVADA MOUNTAIN RANGE OVER THE NEXT COUPLE OF DAYS.  
THESE REGIONS COULD SEE ISOLATED FLASH FLOODING FROM THIS  
CONVECTIVE ACTIVITY.  
 
DANGEROUS HEAT REMAINS IN PLACE ACROSS THE SOUTHERN PLAINS, LOWER  
MISSISSIPPI VALLEY, AND MUCH OF THE SOUTHWEST AND FAR WESTERN  
UNITED STATES. THIS HEAT IS EXPECTED TO REMAIN IN PLACE THROUGH  
MONDAY. EXCESSIVE HEAT WATCHES, WARNINGS AND HEAT ADVISORIES ARE  
IN PLACE ACROSS THESE REGIONS. HIGH TEMPERATURES WILL REACH WELL  
OVER THE CENTURY MARK ACROSS TEXAS AND OKLAHOMA. BY TUESDAY, THE  
DESERT SOUTHWEST WILL SEE TEMPERATURES CLIMB WELL ABOVE 110  
DEGREES--WITH PLACES LIKE PHOENIX, AZ FORECAST TO REACH 117  
DEGREES, LAS VEGAS, NV FORECAST TO REACH 114 DEGREES, AND  
LOCATIONS IN SOUTHERN CALIFORNIA NEARING 120 DEGREES FOR HIGHS.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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