503  
FXUS01 KWBC 182008  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
408 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 AND STRONG THUNDERSTORMS 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 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 STRONGEST  
THUNDERSTORM ACTIVITY AND HEAVY RAINS 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 SUNDAY, TAPERING OFF  
RAIN CHANCES ACROSS THE NORTHEAST. BUT FOR THE REST OF TODAY AND  
INTO THIS EVENING, PORTIONS OF THE COASTAL NORTHERN MID-ATLANTIC  
REGION WILL BE IMPACTED WITH HEAVY RAINS, AS IS REFLECTED BY THE  
FLASH FLOOD WATCH IN PLACE.  
 
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 INTO 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 LOW  
PRESSURE SYSTEM DURING THIS TIME.  
 
FIRE WEATHER CONCERNS CONTINUE ACROSS THE WESTERN U.S.. 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 AS A RESULT OF A NEARBY WILDFIRE.  
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 AS WELL.  
 
WIX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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