087  
FXUS01 KWBC 181959  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
359 PM EDT SAT AUG 18 2018  
 
VALID 00Z SUN AUG 19 2018 - 00Z TUE AUG 21 2018  
   
..ACTIVE WEATHER CONTINUES FOR THE EAST COAST
 
 
...HEAVY RAINFALL EXPECTED TO IMPACT PARTS OF THE PLAINS AND  
MISSISSIPPI VALLEY THROUGH THE REMAINDER OF THE WEEKEND...  
 
...AIR QUALITY WILL REMAIN A CONCERN ACROSS PORTIONS OF THE  
WESTERN U.S., AS WELL AS ACROSS THE UPPER MIDWEST...  
 
A COLD FRONT STRETCHING FROM NEW ENGLAND TO THE SOUTHERN PLAINS  
WILL BE THE FOCUS FOR SHOWERS AND THUNDERSTORMS THROUGHOUT THE  
SOUTH AND EAST THROUGH THE REMAINDER OF THE WEEKEND. THE BEST  
THUNDERSTORM ACTIVITY WILL BE ALONG THE FRONTAL BOUNDARY AS WARM  
MOIST AIR PULLING IN FROM THE GULF OF MEXICO CLASHES WITH A COLDER  
AIRMASS MOVING IN FROM THE NORTH. THE NORTHEASTERN PORTION OF THE  
FRONT IS EXPECTED TO CONTINUE SHIFTING SOUTHEAST AND OFF THE  
ATLANTIC COAST THROUGH TOMORROW, TAPERING OFF RAIN CHANCES ACROSS  
THE NORTHEAST. BUT FOR TODAY, PORTIONS OF THE COASTAL NORTHERN  
MID-ATLANTIC REGION ARE WITHIN A FLASH FLOOD WATCH.  
 
MEANWHILE, A DEEPENING LOW PRESSURE SYSTEM OVER THE SOUTHERN  
PLAINS WILL RAMP UP THE FRONTAL SYSTEM HERE AS IT BEGINS SHIFTING  
NORTHEASTWARD FOR SUNDAY AND THE FIRST PART OF THE WORK WEEK. THE  
STORM PREDICTION CENTER HAS OUTLINED AN AREA ACROSS THE PANHANDLES  
OF TEXAS AND OKLAHOMA, AS WELL AS FAR NORTHEAST NEW MEXICO AND  
SOUTHEAST COLORADO AS BEING IN A SLIGHT RISK FOR SEVERE WEATHER  
THROUGH TONIGHT. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR  
EASTERN COLORADO AND NORTHEAST NEW MEXICO THROUGH THIS EVENING.  
THERE IS ALSO A SLIGHT RISK FOR EXCESSIVE RAINFALL AND FLASH  
FLOODING FOR MUCH OF THIS SAME REGION ISSUED BY THE WEATHER  
PREDICTION CENTER. THE SLIGHT RISK FOR EXCESSIVE RAINFALL WILL  
SHIFT WITH THE DEEPENING LOW PRESSURE CENTER TOWARDS THE EASTERN  
PLAINS FOR SUNDAY, AND INTO THE MIDDLE MISSISSIPPI VALLEY, OHIO  
VALLEY, AND UPPER GREAT LAKES FOR MONDAY AS IT BEGINS TO INTERACT  
WITH ANOTHER COLD FRONT DROPPING IN FROM CANADA. MARGINAL RISKS  
FOR SEVERE WEATHER WILL ALSO ACCOMPANY PORTIONS OF THIS SYSTEM  
DURING THIS TIME.  
 
FIRE WEATHER CONCERNS CONTINUE ACROSS THE WESTERN U.S., WITH  
IMPACTS SPREADING ACROSS THE NORTHERN U.S. AS WELL. RED FLAG  
WARNINGS REMAIN IN EFFECT THROUGH LATE THIS EVENING FOR SOUTHWEST  
WYOMING AND CENTRAL UTAH DUE TO A COMBINATION OF HIGH WINDS, LOW  
HUMIDITIES, AND THE THREAT OF LOW PRECIPITATING THUNDERSTORMS  
SPARKING NEW WILDFIRES. A DENSE SMOKE ADVISORY IS IN EFFECT FOR  
NORTH-CENTRAL MONTANA DUE TO NEARBY WILDFIRES. FURTHERMORE, AIR  
QUALITY ALERTS REMAIN IN PLACE ACROSS PORTIONS OF THE WEST AND  
NORTHWEST, INCLUDING MUCH OF THE NORTHERN GREAT BASIN, DUE TO  
SMOKE POLLUTION. LARGE WILDFIRES IN SOUTH-CENTRAL CANADA ARE ALSO  
ADVECTING SMOKE SOUTHWARD, RESULTING IN AIR QUALITY ALERTS FOR  
MUCH OF MINNESOTA.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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