650  
FXUS01 KWBC 291954  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
353 PM EDT FRI JUN 29 2018  
 
VALID 00Z SAT JUN 30 2018 - 00Z MON JUL 02 2018  
 
...SEVERE WEATHER AND FLASH FLOODING POSSIBLE FOR PARTS OF THE  
PLAINS TO THE MIDWEST...  
 
...HOT AND HUMID WEATHER WILL PERSIST THROUGH THE WEEKEND ACROSS  
THE EASTERN HALF OF THE COUNTRY...  
 
...FIRE WEATHER CONDITIONS CONTINUE THROUGH SATURDAY FOR PORTIONS  
OF THE WEST...  
 
A SURFACE LOW PRESSURE SYSTEM AND ITS ASSOCIATED COLD FRONT, AS  
WELL AS AN UPPER-LEVEL TROUGH TO THE WEST, WILL LEAD TO CONTINUED  
RAIN AND THUNDERSTORMS FOR THE PLAINS TO MIDWEST THIS WEEKEND. THE  
STORM PREDICTION CENTER HAS A SLIGHT RISK OF SEVERE WEATHER  
OUTLOOKED FOR THE NORTHERN AND CENTRAL PLAINS TO THE UPPER  
MISSISSIPPI VALLEY THROUGH SATURDAY MORNING, AND FOR THE UPPER  
MIDWEST TO THE MIDDLE MISSISSIPPI VALLEY ON SATURDAY AS THE STORMS  
MOVE EASTWARD. RAIN OF 1-3 INCHES IS FORECAST FOR MUCH OF IOWA  
NORTHEASTWARD TO THE UPPER PENINSULA OF MICHIGAN. SOME OF THESE  
AREAS HAVE SEEN PRODIGIOUS RAINFALL RECENTLY WHICH SATURATED THE  
GROUND, SO A MODERATE RISK OF EXCESSIVE RAINFALL/FLASH FLOODING  
WILL BE IN EFFECT FOR PORTIONS OF IOWA ON SATURDAY AND SATURDAY  
NIGHT.  
 
THE SOUTHEASTERN U.S. IS ALSO EXPECTING RAIN AND THUNDERSTORMS  
THROUGH THE WEEKEND WITH LOW PRESSURE IN THE REGION. RAINFALL OF  
1-2 INCHES IS POSSIBLE, PARTICULARLY FOR THE FLORIDA PANHANDLE. A  
FEW STRONG STORMS COULD BE POSSIBLE, BUT FLASH FLOODING IS  
UNLIKELY THERE. ADDITIONALLY, STRONG THUNDERSTORMS COULD OCCUR IN  
NEW ENGLAND ON SATURDAY EVENING AND NIGHT. SOME SCATTERED  
THUNDERSTORMS ARE FORECAST THROUGH THE WEEKEND IN THE SOUTHERN  
HIGH PLAINS AS WELL.  
 
AHEAD OF THE UPPER-LEVEL TROUGH, AN UPPER-LEVEL RIDGE HAS TAKEN  
HOLD OVER THE EASTERN PART OF THE U.S., USHERING IN HOT AND HUMID  
WEATHER WITH HIGH TEMPERATURES IN THE 90S AND HEAT INDICES OVER  
100 DEGREES FROM THE SOUTHERN PLAINS ALL THE WAY TO THE NORTHEAST.  
ON SATURDAY, THE MIDWEST IS FORECAST TO SEE HIGH TEMPERATURES UP  
TO 20 DEGREES ABOVE AVERAGE. ON SUNDAY, SOME RECORD HIGHS ARE  
LIKELY TO BE BROKEN IN THE LOWER GREAT LAKES REGION TO THE  
NORTHEAST. WIDESPREAD EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES  
ARE IN EFFECT. HOWEVER, THE INTERMOUNTAIN WEST TO NORTHERN AND  
CENTRAL ROCKIES WILL SEE TEMPERATURES UP TO 20 DEGREES BELOW  
NORMAL ON SATURDAY, IN ACCORDANCE WITH THE COOL UPPER-LEVEL  
TROUGH.  
 
HOT, DRY, AND WINDY WEATHER IN AREAS OF ONGOING DROUGHT MEANS THE  
THREAT FOR WILDFIRES REMAINS IN THE FOUR CORNERS REGION. THE STORM  
PREDICTION CENTER HAS OUTLOOKED EASTERN UTAH, WESTERN COLORADO,  
AND FAR NORTHERN ARIZONA IN A CRITICAL RISK THROUGH FRIDAY  
EVENING, AND RED FLAG WARNINGS ARE IN EFFECT. HOT TEMPERATURES AND  
LOW HUMIDITY IN INTERIOR NORTHERN CALIFORNIA WILL INCREASE THE  
THREAT FOR FIRES THERE AS WELL. AN ELEVATED THREAT OF FIRES  
REMAINS ON SATURDAY FOR THE FOUR CORNERS REGION AND PARTS OF  
NORTHERN CALIFORNIA.  
 
TATE  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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