217  
FXUS01 KWBC 222016  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
415 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...  
 
...UNSETTLED WEATHER EXPECTED ACROSS THE CENTRAL AND EASTERN GULF  
OF MEXICO....  
 
...SEVERE WEATHER POSSIBLE ACROSS THE NORTHERN AND CENTRAL PLAINS  
THROUGH TONIGHT...  
 
...DANGEROUS HEAT TO CONTINUE ACROSS THE SOUTHERN CENTRAL 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  
THROUGH TONIGHT, DUE TO THE THREAT OF MODERATE TO HEAVY RAINFALL  
ON TOP OF ALREADY SATURATED SOILS FROM IMPRESSIVE RAINS THAT MOVED  
THROUGH THE REGION YESTERDAY.  
 
MEANWHILE, AN EXPANSIVE FRONTAL SYSTEM THAT PUSHED ACROSS MUCH OF  
THE SOUTHEAST OVER THE LAST 24 HOURS HAS NOW SLOWED SIGNIFICANTLY  
AS IT NEARS THE GULF OF MEXICO COAST AND EXTENDS NORTHWARD INTO  
THE MID ATLANTIC. THIS FRONTAL BOUNDARY IS ACTING AS THE FOCUS FOR  
SHOWERS AND THUNDERSTORMS ACROSS THESE REGIONS. MUCH OF FLORIDA,  
SOUTHERN GEORGIA, AND SOUTHERN MISSISSIPPI 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 FOR THIS SAME AREA. A  
SLIGHT RISK OF SEVERE THUNDERSTORMS WILL BE POSSIBLE ALONG  
SOUTHERN LOUISIANA AND SOUTHERN ALABAMA DURING THE DAY MONDAY AS  
THE FRONTAL SYSTEM BECOMES 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 WHICH WILL  
CONTINUE INTO THE OVERNIGHT. 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 ALSO 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 ACROSS THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY,  
AND THROUGH AT LEAST MID-WEEK FOR THE SOUTHWEST AND MUCH OF THE  
WESTERN COAST. EXCESSIVE HEAT WATCHES, WARNINGS AND HEAT  
ADVISORIES ARE CURRENTLY IN PLACE ACROSS THESE REGIONS. 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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