276  
FXUS01 KWBC 090802  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
402 AM EDT THU AUG 09 2018  
 
VALID 12Z THU AUG 09 2018 - 12Z SAT AUG 11 2018  
 
...UNSETTLED WET WEATHER FROM THE EASTERN U.S. TO THE SOUTHERN  
PLAINS WITH A LINGERING HEAVY RAINFALL THREAT ACROSS THE SOUTH  
THROUGH FRIDAY...  
   
..NEAR RECORD-BREAKING HEAT LIKELY OUT WEST
 
 
...MONSOONAL MOISTURE WILL BRING AN ELEVATED HEAVY RAINFALL/FLASH  
FLOOD RISK TO PORTIONS OF THE SOUTHWEST AND SOUTHERN ROCKIES...  
 
MUCH OF THE SOUTHERN TIER OF THE U.S. WILL BE IN A WET PATTERN  
THROUGH THE END OF THE WEEK. AS A SURFACE LOW LIFTS NORTHEAST  
THROUGH NEW ENGLAND A COLD FRONT WILL PASS THROUGH THE NORTHEAST  
WHILE THE TRAILING END SLOWS FROM THE MID-ATLANTIC TO THE  
CENTRAL/SOUTHERN PLAINS. MOISTURE STREAMING NORTHWARD OVER THE  
BOUNDARY WILL INITIATE WIDESPREAD CONVECTION, AND WITH THE  
STAGNANT NATURE OF THIS BOUNDARY, STORMS WILL LIKELY PASS OVER THE  
SAME LOCATIONS. THIS WILL INCREASE THE RISK FOR FLASH FLOODING.  
ADDITIONALLY, MONSOONAL MOISTURE ROUNDING THE BASE OF A STRONG  
UPPER LEVEL RIDGE OVER THE WESTERN U.S. WILL KEEP MAINLY DIURNALLY  
DRIVEN SHOWERS AND THUNDERSTORMS IN THE FORECAST ACROSS THE  
SOUTHWEST THROUGH THE REST OF THE WORK WEEK. HEAVY RAINFALL AND  
LOCALIZED FLASH FLOODING WILL BE POSSIBLE, ESPECIALLY ALONG THE  
FAVORED TERRAIN. WPC HAS A SLIGHT RISK FOR EXCESSIVE RAINFALL IN  
EFFECT FOR PORTIONS OF ARIZONA, NEW MEXICO, AND FROM NORTHEAST  
TEXAS TO NORTHERN ALABAMA TODAY, THEN PRIMARILY FROM ARIZONA TO  
CENTRAL TEXAS THIS WEEKEND.  
 
WITH A STRONG RIDGE ANCHORED OVER THE WEST TEMPERATURES WILL  
CONTINUE TO RISE, ESPECIALLY FOR PARTS OF THE PACIFIC NORTHWEST,  
INTERMOUNTAIN WEST AND THE NORTHERN HIGH PLAINS. HOT AND DRY  
CONDITIONS ARE EXPECTED FROM THE INTERIOR PACIFIC NORTHWEST TO  
EASTERN MONTANA. NEAR OR RECORD BREAKING TEMPERATURES IN THE 90S  
AND 100S ARE FORECAST THROUGH FRIDAY, WHICH ARE AS MUCH AS 10 TO  
20 DEGREES ABOVE NORMAL FOR THIS TIME OF THE YEAR. EXCESSIVE HEAT  
WARNINGS AND HEAT ADVISORIES ARE IN EFFECT FROM WASHINGTON AND  
OREGON TO MONTANA. ONGOING WILDFIRES CONTINUE TO CAUSE POOR AIR  
QUALITY ISSUES. THE HOT AND DRY CONDITIONS WILL ONLY EXACERBATE  
THE FIRE WEATHER CONCERNS OUT WEST, PARTICULARLY FOR THOSE AREAS  
ALREADY DEALING WITH WILDFIRES.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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