238  
FXUS66 KOTX 172320  
AFDOTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SPOKANE WA  
420 PM PDT WED OCT 17 2018  
   
SYNOPSIS
 
 
A RIDGE OF HIGH PRESSURE WILL PERSIST OVER THE INLAND NORTHWEST  
THROUGH THE WEEK AND INTO THE WEEKEND. THIS WILL BRING MAINLY  
CLEAR SKIES, LIGHT WINDS WITH CHILLY MORNING TEMPERATURES AND  
MILD AFTERNOONS HIGHS. THE NEXT CHANCE OF PRECIPITATION LOOKS LIKE  
IT COULD ARRIVE BY NEXT TUESDAY OR WEDNESDAY.  
 

 
   
DISCUSSION
 
 
VERY LITTLE CHANGE IN OUR CURRENT TRANQUIL WEATHER PATTERN IS  
EXPECTED THROUGH THE WEEKEND. A BROAD BLOCKING HIGH PRESSURE RIDGE  
WILL CONTINUE TO DEFLECT STORM SYSTEMS WELL NORTH OF OUR REGION.  
THROUGH THE WEEKEND, THE INLAND NORTHWEST WILL CONTINUE TO  
EXPERIENCE MAINLY CLEAR SKIES, LIGHT WINDS, CHILLY NIGHTS, AND  
MILD AFTERNOONS.  
 
TONIGHT: OVERNIGHT TEMPERATURES WILL AGAIN DIP INTO THE 30S OVER  
THE MAJORITY OF EASTERN WASHINGTON AND NORTH IDAHO. OUR SHELTERED  
VALLEYS AROUND REPUBLIC, DEER PARK, NEWPORT, AND PRIEST LAKE WILL  
HAVE A GOOD SHOT OF MID TO UPPER 20S. POCKETS OF FOG WILL LIKELY  
DEVELOP IN SPOTS ALONG THE PEND OREILLE RIVER AND AROUND PRIEST  
LAKE SIMILAR TO LAST NIGHT. IN GENERAL OUR AIR MASS IS TOO DRY FOR  
WIDESPREAD FOG, SO OUR CHILLIEST SHELTERED VALLEYS WITH WARM WATER  
BODIES WILL BE THE MOST PRONE TO FOG.  
 
THURSDAY THROUGH SATURDAY: NO SIGNIFICANT CHANGES HAVE BEEN MADE  
TO THE FORECAST FOR THIS TIME FRAME. SEASONABLY CHILLY NIGHTS AND  
MILD AFTERNOONS ARE EXPECTED. PERSISTENT HIGH PRESSURE WILL  
CONTINUE TO PRODUCE MAINLY CLEAR SKIES AND LIGHT WINDS.  
 
SUNDAY THROUGH WEDNESDAY: THE STRONG HIGH PRESSURE WILL CONTINUE  
OVER THE AREA FOR SUNDAY AND MONDAY. ONE OF THOSE TWO DAYS WILL BE  
THE WARMEST OF THIS EPISODE, WITH HIGHS IN THE MID 60 TO NEAR 70 ACROSS  
THE REGION. THEN THE WEATHER PATTERN WILL TAKE A MARKED TURN AS  
THE HIGH PRESSURE FINALLY MOVES OFF TO OUR EAST, OPENING THE  
PACIFIC STORM DOOR.  
 
THE FIRST FRONT WILL MOVE ONSHORE MONDAY NIGHT, REACHING THE  
PANHANDLE BY TUESDAY AFTERNOON OR EVENING. IT'S TOO FAR INTO THE  
FUTURE TO GET DETAILED ABOUT THE FORECAST, BUT I WOULDN'T RULE OUT  
THE POSSIBILITY OF SOME THUNDERSTORMS ON THE LEADING EDGE OF THIS  
FRONT. USUALLY WE DON'T SEE A LOT OF RAIN FROM THE FIRST FRONT,  
SO THE GFS LOOKS A LITTLE OVERDONE TO ME. A SECOND WEATHER SYSTEM  
WILL FOLLOW ON ITS HEELS, BRING THE POTENTIAL FOR MORE RAIN ON  
WEDNESDAY. TEMPERATURES ON TUESDAY AND WEDNESDAY WILL FALL BACK  
INTO THE MID 50S, MORE TYPICAL FOR LATE OCTOBER. RJ  
 

 
   
AIR QUALITY
 
 
AIR QUALITY SENSORS ACROSS THE REGION ARE MAINLY IN THE GOOD TO  
MODERATE RANGE. STRONG OVERNIGHT/MORNING INVERSIONS ARE A  
BYPRODUCT OF BIG HIGH PRESSURE RIDGES THIS TIME OF THE YEAR.  
SEVERAL WEB CAMERAS ACROSS THE INLAND NORTHWEST LOOK "HAZY" AS  
POLLUTION CONCENTRATIONS BUILD UP UNDER THE INVERSION. WITH  
ANOTHER 4 OR 5 DAYS OF LIGHT WINDS AND INVERSIONS, WE ARE WORKING  
WITH AIR QUALITY AGENCIES TO URGE FOLKS TO ABIDE LOCAL BURN BANS.  
EVEN THOUGH THESE WARM AND DRY DAYS SEEM PERFECT FOR BURNING  
LEAVES AND YARD WASTE, WAITING TO BURN UNTIL NEXT WEEK IS THE  
NEIGHBORLY THING TO DO. THE MEDIUM RANGE MODELS CONTINUE TO  
FORECAST A PATTERN CHANGE AROUND TUESDAY OR WEDNESDAY WITH MORE  
WIND FOR IMPROVED SMOKE DISPERSION. /GKOCH  
 

 
   
AVIATION
 
 
00Z TAFS: HIGH PRESSURE WILL BRING MOSTLY CLEAR SKIES AND LIGHT  
WINDS. YET SHALLOW FOG IS POSSIBLE NEAR RIVERS VALLEYS IN THE  
MORNING, INCLUDING SFF. HAZE COLLECTING UNDER THE HIGH MAY PRODUCE  
SOME VISIBILITY REDUCTIONS TOO, BUT NOTHING WIDESPREAD OR  
PERSISTENT IS EXPECTED AT THIS TIME. IT WILL BE MONITORED. /COTE'  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SPOKANE 39 63 39 63 40 64 / 0 0 0 0 0 0  
COEUR D'ALENE 36 66 37 65 37 66 / 0 0 0 0 0 0  
PULLMAN 38 67 39 67 40 68 / 0 0 0 0 0 0  
LEWISTON 40 68 41 68 42 69 / 0 0 0 0 0 0  
COLVILLE 31 67 32 66 33 67 / 0 0 0 0 0 0  
SANDPOINT 30 64 31 64 32 65 / 0 0 0 0 0 0  
KELLOGG 34 65 35 64 36 66 / 0 0 0 0 0 0  
MOSES LAKE 32 67 33 66 34 67 / 0 0 0 0 0 0  
WENATCHEE 40 65 41 65 42 66 / 0 0 0 0 0 0  
OMAK 33 67 36 67 37 67 / 0 0 0 0 0 0  
 

 
   
OTX WATCHES/WARNINGS/ADVISORIES
 
 
ID...NONE.  
WA...NONE.  
 

 
 

 
 
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