072  
FXUS02 KWBC 060526  
PMDEPD  
 
EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
125 AM EDT MON AUG 06 2018  
 
VALID 12Z THU AUG 09 2018 - 12Z MON AUG 13 2018  
   
..RECORD HEAT FOR THE INTERIOR NORTHWEST THURSDAY/FRIDAY
 
 
   
..PATTERN OVERVIEW AND GUIDANCE/PREDICTABILITY ASSESSMENT
 
 
THE DOMINANT UPPER HIGH IN THE WEST WILL BE PUSHED OVER AS AN  
UPPER LOW OVER THE NORTHEASTERN PACIFIC FINALLY MOVES  
NORTHEASTWARD INTO SOUTHERN BRITISH COLUMBIA. IN THE EAST,  
TROUGHING WILL BE REINFORCED THIS WEEKEND AS A POTENTIAL UPPER LOW  
SINKS TOWARD THE OHIO VALLEY. THE MODELS/ENSEMBLES WERE IN VERY  
GOOD AGREEMENT OVERALL AND A MAJORITY DETERMINISTIC BLEND WAS USED  
FOR THE PERIOD.  
 
   
..WEATHER HIGHLIGHTS AND HAZARDS
 
 
NEAR OR ABOVE RECORD HIGH TEMPERATURES ARE FORECAST FOR MUCH OF  
THE INTERIOR NORTHWEST THURSDAY/FRIDAY AHEAD OF THE UPPER LOW WITH  
100S WIDESPREAD EAST OF THE CASCADES AND THROUGH THE SNAKE VALLEY  
IN IDAHO AND ALSO THE MISSOURI RIVER VALLEY IN MONTANA. LIGHT  
PRECIPITATION WILL BE CONFINED TO COASTAL/NORTHERN/HIGHER  
ELEVATION AREAS OF WASHINGTON AS THE BEST UPPER SUPPORT TRAVELS  
THROUGH CANADA. HEAVIER CONVECTIVE PRECIPITATION IS LIKELY IN THE  
DEEPER MOISTURE ON THE EASTERN SIDE OF THE UPPER HIGH FROM  
NM/CO/AZ EASTWARD TO THE SOUTHERN PLAINS. SEVERAL INCHES OF RAIN  
OVER A FEW DAYS APPEARS LIKELY WHICH MAY LEAD TO LOCALIZED  
FLOODING.  
 
PRECIPITATION WILL ACCOMPANY AND PRECEDE A FRONTAL BOUNDARY AS IT  
PUSHES THROUGH THE GREAT LAKES AND INTO THE NORTHEAST VIA  
AFTERNOON STORMS. ANOTHER FRONT WILL LINGER ACROSS THE U.S.  
SOUTHERN TIER DURING THE PERIOD WHICH WILL HELP SPARK AFTERNOON  
SHOWERS/STORMS AND LOCALLY HEAVY RAINFALL IN THE WARM/HUMID  
AIRMASS. AS THE TROUGH DIGS SOUTHWARD OUT OF THE GREAT LAKES, MORE  
WIDESPREAD PRECIPITATION MAY BE FAVORED TO ITS EAST ALONG THE  
APPALACHIANS TO THE I-95 CORRIDOR.  
 
FRACASSO  
 
WPC MEDIUM RANGE 500 MB HEIGHTS, SURFACE SYSTEMS, WEATHER GRIDS,  
QUANTITATIVE PRECIPITATION, WINTER WEATHER OUTLOOK PROBABILITIES  
AND HEAT INDEXES ARE FOUND AT:  
 
HTTPS://WWW.WPC.NCEP.NOAA.GOV/MEDR/5DAYFCST500_WBG.GIF  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/MEDR/5DAYFCST_WBG_CONUS.GIF  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/5KM_GRIDS/5KM_GRIDSBODY.HTML  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/QPF/DAY4-7.SHTML  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/WWD/PWPF_D47/PWPF_MEDR.PHP?DAY=4  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/HEAT_INDEX.SHTML  
 

 
 
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