406  
FXUS66 KOTX 231807  
AFDOTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SPOKANE WA  
1107 AM PDT SUN JUL 23 2017  
   
SYNOPSIS
 
 
ANOTHER WARM AND QUIET START TO THE DAY. A COLD FRONT WILL ARRIVE  
LATE THIS EVENING, BRINGING BREEZY TO WINDY CONDITIONS ACROSS THE  
INLAND NORTHWEST. THERE IS A SLIGHT CHANCE OF MOUNTAIN  
THUNDERSTORMS ON WEDNESDAY. THURSDAY WILL BE BREEZY.  
 

 
   
DISCUSSION
 
 
...WINDY CONDITIONS LATE THIS AFTERNOON AND CONTINUING THROUGH THE  
NIGHT ACROSS THE CASCADE GAPS AND OKANOGAN VALLEY SPREADING INTO  
THE COLUMBIA BASIN...  
   
FIRE WEATHER
 
TODAY AND TONIGHT: MOSTLY CLEAR SKIES TODAY WITH  
CONTINUED HOT TEMPERATURES ACROSS THE REGION. FORECAST CHALLENGE  
IS THE DRY COLD FRONT SET TO MOVE ACROSS THE REGION LATER TODAY.  
WINDS WILL INCREASE ACROSS THE CASCADE VALLEYS BY MID AFTERNOON  
WITH WINDS SHIFTING TO THE NORTH AND INCREASING DOWN THE OKANOGAN  
VALLEY A FEW HOURS LATER. HAVE KEPT THE CURRENT RED FLAG WARNING  
OUT AND EXTENDED IT A BIT LONGER. HAVE IT STARTING BY 4PM AND  
GOING THROUGH 3AM. WITH THE PUNCH OF DRY AIR MOVING INTO THE  
REGION TONIGHT RECOVERIES ARE GOING TO BE TERRIBLY POOR ACROSS THE  
CENTRAL PART OF THE STATE. ADD TO THAT WIND GUSTS 30-40 MPH...THE  
FIRE WEATHER ENVIRONMENT WILL BE CRITICAL. THERE IS ALSO THE  
THREAT OF BLOWING DUST ACROSS PORTIONS OF THE WATERVILLE PLATEAU  
AND INTO THE COLUMBIA BASIN. THE WINDS WILL CONTINUE TO BLOW  
THROUGH THE NIGHT AS RH VALUES REMAIN LOW.  
 
MONDAY THROUGH TUESDAY: WINDS WILL DECREASE THROUGH THE DAY.  
HOWEVER RELATIVE HUMIDITIES ACROSS THE REGION WILL REMAIN VERY  
LOW. WE WILL COOL ABOUT 4-6 DEGREES TO BE RIGHT AROUND AVERAGE FOR  
THIS TIME OF THE YEAR. /NISBET  
 
TUESDAY NIGHT THROUGH SUNDAY: AS THE CALIFORNIA LOW SHIFTS INTO  
THE REGION, IT WILL BEGIN TO COLLAPSE. SOME LINGERING INSTABILITY  
FROM IT COULD PRODUCE SOME THUNDER IN THE EXTREME SOUTHEASTERN  
PORTION OF THE CWA ON WEDNESDAY. A QUICK HITTING SHORTWAVE TROF ON  
THURSDAY AM COULD BRING A LIGHTNING STRIKE TO THE CASCADES.  
MODELS ARE SHOWING HIGH CONFIDENCE FOR ANY IMPACTS OUTSIDE OF AN  
ISOLATED LIGHTNING STRIKE FOR THESE DAYS. WINDS WILL BE GENERALLY  
BREEZY DURING THE AFTERNOONS ACROSS THE COLUMBIA BASIN WITH  
SUSTAINED IN THE LOW TEENS AND GUSTS TO NEAR 25 MPH FOR MOST  
LOCATIONS. HIGHS WILL RANGE FROM THE MID 90S TO MID 80S ACROSS THE  
REGION. LOWS WILL BE IN THE LOW 60S TO 50S. /JDC  
 

 
   
AVIATION
 
 
18Z TAFS: A DRY COLD FRONT IS ON TAP TO IMPACT THE REGION THIS  
EVENING AND OVERNIGHT. VIS AND CEILINGS WILL REMAIN VFR THROUGH  
THE 24 HOUR TAF PERIOD. THE ONLY CHANGES TO THE INHERITED TAFS WAS  
INCREASING NORTHERLY GUSTS AT KGEG AND KSFF LATE TONIGHT. AS THE  
DRY COLD FRONT PUSHES THROUGH, EXPECT WINDS TO INCREASE SHARPLY  
FROM THE NORTH THROUGH THE EARLY MORNING HOURS BEFORE TAPERING  
OFF MONDAY. OTHERWISE THE OKANOGAN VALLEY/HIGHLANDS CAN EXPECT  
GUSTY WINDS AS HIGH AS 30-40 KNOTS. KEAT TO KMWH WILL ALSO BE  
QUITE BREEZY WITH GUSTS 20-30 KNOTS...STRONGEST NEAR THE CASCADES.  
/AB  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SPOKANE 92 61 86 60 90 63 / 0 0 0 0 0 10  
COEUR D'ALENE 91 57 86 55 90 57 / 0 0 0 0 0 10  
PULLMAN 91 57 86 54 89 59 / 0 0 10 0 0 10  
LEWISTON 99 66 94 62 97 67 / 0 0 10 0 10 10  
COLVILLE 92 52 87 51 92 55 / 0 0 0 0 0 0  
SANDPOINT 89 50 84 47 88 51 / 0 0 0 0 0 10  
KELLOGG 89 55 84 53 87 55 / 0 0 10 0 10 10  
MOSES LAKE 97 59 91 56 95 60 / 0 0 0 0 0 0  
WENATCHEE 94 62 90 64 93 68 / 0 0 0 0 0 0  
OMAK 95 60 90 59 94 62 / 0 0 0 0 0 0  
 

 
   
OTX WATCHES/WARNINGS/ADVISORIES
 
 
ID...NONE.  
WA...RED FLAG WARNING FROM 4 PM THIS AFTERNOON TO 3 AM PDT MONDAY FOR  
EAST WASHINGTON CENTRAL CASCADE VALLEYS (ZONE 677)-EAST  
WASHINGTON OKANOGAN/METHOW VALLEYS (ZONE 684).  
 

 
 

 
 
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