720  
FXUS01 KWBC 302009  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
409 PM EDT THU AUG 30 2018  
 
VALID 00Z FRI AUG 31 2018 - 00Z SUN SEP 02 2018  
 
...HEAVY RAIN AND SEVERE WEATHER POSSIBLE FOR THE MISSISSIPPI  
VALLEY THROUGH SATURDAY...  
   
..HEAT WAVE COMING TO AN END ALONG THE EAST COAST.
 
 
   
..FIRE WEATHER CONCERNS ACROSS THE WEST
 
 
THE MISSISSIPPI VALLEY AND NORTHERN/CENTRAL PLAINS WILL EXPERIENCE  
AN ACTIVE WEATHER PATTERN MOVING INTO THE HOLIDAY WEEKEND. BY  
LATER TONIGHT AND INTO EARLY FRIDAY MORNING, A CLUSTER OF  
THUNDERSTORMS WILL FORM ALONG THE WARM FRONT DRAPED ACROSS THE  
MIDDLE MISSISSIPPI VALLEY AND MOVE SOUTHWARD ACROSS SOUTHWEST IOWA  
AND MISSOURI. THESE STORMS MAY BE CAPABLE OF PRODUCING FLASH  
FLOODING--WHICH IS HIGHLIGHTED BY WPC'S EXCESSIVE RAINFALL OUTLOOK  
WITH A SLIGHT RISK. THE SEVERE WEATHER RISK WILL REMAIN MARGINAL.  
ON FRIDAY, A COLD FRONT WILL MOVE FROM THE NORTHERN INTO THE UPPER  
MIDWEST. HEAVY RAINFALL ESPECIALLY ALONG THE SURFACE LOW CAN BE  
EXPECTED--MOSTLY ACROSS MINNESOTA. A SLIGHT RISK OF THUNDERSTORMS  
WILL ALSO BE POSSIBLE ESPECIALLY IN THE MISSISSIPPI VALLEY AND  
NORTHERN/CENTRAL PLAINS. FROM LATE FRIDAY NIGHT AND INTO EARLY  
SATURDAY MORNING, AS THE FRONT CONTINUES MOVING SOUTH AND STALLS,  
ANOTHER CLUSTER OF THUNDERSTORMS WILL MOVE ACROSS THE UPPER/MIDDLE  
MISSISSIPPI VALLEY AND PORTIONS OF THE OHIO VALLEY. ONCE THE FRONT  
STALLS ACROSS THE GREAT LAKES AND INTO THE CENTRAL PLAINS,  
SCATTERED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED ALONG THE  
FRONT.  
 
THE HEAT WAVE THAT HAS PLAGUED THE EASTERN AND SOUTHERN U.S. WILL  
BE COMING TO AN END TODAY ESPECIALLY FOR THE MID-ATLANTIC AND  
NORTHEAST. A COLD FRONT HAS PUSHED ALONG NEW ENGLAND AND NORTHEAST  
AND WILL STALL IN THE MID-ATLANTIC. CONTINUOUS ROUNDS OF SHOWERS  
AND THUNDERSTORMS OVER THE NEXT FEW DAYS CAN BE EXPECTED FOR THE  
MID-ATLANTIC, TENNESSEE VALLEY, AND SOUTHEAST. THIS ACTIVITY WILL  
ASSIST IN KEEPING THE HIGH TEMPERATURES MUCH COOLER THAN WHAT HAS  
BEEN RECORDED THIS WEEK ESPECIALLY FOR THE MID-ATLANTIC.  
 
FIRE WEATHER CONCERNS WILL BE CRITICAL TODAY ACROSS THE WEST. DUE  
TO A COMBINATION OF WARM TEMPERATURES, LOW HUMIDITIES AND GUSTY  
WINDS, RED FLAG WARNINGS ARE IN EFFECT FOR MOST OF WYOMING,  
NORTHWEST COLORADO, PORTIONS OF UTAH AND EXTREME SOUTHWEST SOUTH  
DAKOTA. FURTHERMORE, THE SOUTHERN FOOT HILLS IN SOUTH DAKOTA HAVE  
CRITICAL FIRE WEATHER CONDITIONS AND ARE UNDER EXTREME FIRE DANGER  
FOR TODAY. ADDITIONALLY, AIR QUALITY ISSUES REMAIN FOR SOUTHWEST  
OREGON FROM NEARBY WILDFIRES. THIS REGION IS UNDER AN AIR QUALITY  
ALERT ISSUED UNTIL FURTHER NOTICE. ELSEWHERE, SUBTROPICAL MOISTURE  
WILL AID IN DIURNALLY DRIVEN THUNDERSTORMS ACROSS THE GULF COAST  
THROUGH SATURDAY--WITH HEAVY RAINFALL PARTICULARLY EXPECTED FOR  
PARTS OF THE CENTRAL GULF COAST ON SATURDAY.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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