764  
FXUS66 KOTX 230607  
AFDOTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SPOKANE WA  
1007 PM PST TUE JAN 22 2019  
   
SYNOPSIS
 
 
A STRONG WEATHER SYSTEM WILL BRING MODERATE TO HEAVY SNOW  
ACCUMULATIONS TONIGHT TO MUCH OF THE AREA WITH ONLY THE DEEPER  
PORTIONS OF THE WESTERN COLUMBIA BASIN ESCAPING WITH MINOR  
OVERNIGHT ACCUMULATIONS. BREEZY AND UNSETTLED CONDITIONS WILL  
CONTINUE THROUGH WEDNESDAY. EXPECT GENERALLY DRY WEATHER WITH  
OCCASIONAL FOG AND SEASONABLE TEMPERATURES FROM THURSDAY THROUGH  
THE WEEKEND.  
 

 
   
DISCUSSION
 
 
EVENING UPDATE: LIGHT TO MODERATE SNOW IS FALLING ACROSS MOST  
LOCATIONS ACROSS THE INLAND NW THIS EVENING. SNOW HAS BEEN SLOWER  
TO FILL IN ACROSS FAR N IDAHO THAN EXPECTED BUT MOVED INTO  
SANDPOINT IN THE LAST HOUR AND WILL BE IN THE BONNERS FERRY AREA  
SHORTLY. THE HEAVIEST ACTIVITY IS ACCOMPANYING THE 700MB WARM  
FRONT WHICH EXTENDS FROM ROUGHLY TONASKET TO WILBUR TO MOSES LAKE.  
THE FRONT AND HIGHER PRECIPITATION INTENSITIES WILL BEGIN TO  
TRACK EASTWARD IN THE NEXT 3-6 HOURS AND WE SHOULD SEE SNOW REALLY  
PICK UP ACROSS THE EASTERN THIRD OF WA AND N ID. AS OF  
8PM...PRECIPITATION HAS BEEN PREDOMINANTLY SNOW FOR ALL LOCATIONS  
OUTSIDE THE LOWER COLUMBIA BASIN. IT HAS BEEN MAINLY RAIN FOR  
MOSES LAKE, EPHRATA AND POINTS SOUTHWARD. REPORTS SUGGEST  
RAIN/SNOW MIX ALONG THE SNAKE RIVER AND NORTHERN GARFIELD COUNTY  
BUT RITZVILLE HAS BEEN MODERATE TO HEAVY WET SNOW AT 33F WITH 2.5  
INCHES ALREADY ON THE GROUND.  
 
FORECAST HAS BEEN UPDATED TO INCLUDE THE 00Z GUIDANCE AND THIS  
HAS PUSHED SNOW AMOUNTS UP SOME FOR LOCATIONS ACROSS THE UPPER  
COLUMBIA BASIN LIKE DAVENPORT, AIRWAY HEIGHTS, AND DOWN INTO THE  
HIGHER TERRAIN OF THE PALOUSE FROM ROSALIA TO PULLMAN AND INTO THE  
CENTRAL IDAHO PANHANDLE AROUND CD'A...ST MARIES...AND MOSCOW.  
THERE IS STILL MODERATE UNCERTAINTY WITH THESE AMOUNTS WITH SOME  
WAVERING WHEN THE WARMER AIR MAY SWITCH PCPN TO RAIN. IT DOES  
APPEAR THE COLUMN WILL WARM AND MAKE THE SWITCH BUT IT COULD ALSO  
COME NEAR THE END OF THE HEAVIEST PRECIPITATION AFTER 3 TO 6  
INCHES.  
 
PRECIPITATION INTENSITIES WILL RAPIDLY WANE ACROSS THE COLUMBIA  
FROM WEST TO EAST AFTER 1AM NOTED BY RAPID DRYING WITHIN THE  
DENDRITIC LAYER BUT A WEST TO EAST BAND OF SNOW WILL CONTINUE TO  
IMPACT THE NORTHERN MOUNTAINS ON THE NORTHERN PERIPHERY OF THE  
SURFACE LOW AND UNDER THE COOLER TEMPERATURES OF THE 700MB LOW  
CENTER AND THIS PERIOD FROM ROUGHLY 3AM TO 6AM COULD PROVE TO BE  
THE TIME WHEN WE SEE THE HEAVIEST SNOWFALL RATES FROM SANDPOINT TO  
REPUBLIC AND POSSIBLY INTO OROVILLE. /SB  
 
WE ARE ALSO CONTINUING TO CLOSELY MONITOR FOR ISOLATED STRONG WIND  
GUSTS IN THE CENTRAL CASCADES OF SOUTHERN CHELAN COUNTY,  
WATERVILLE PLATEAU, AND VANTAGE AREA. MODELS DID NOT CHANGE THE  
TONE MUCH SO STILL THINKING THESE WINDS OF 50-75 MPH WILL LARGELY  
REMAIN ON THE EXPOSED RIDGETOPS BUT SOMETHING WE WILL BE WATCHING  
FROM 1AM THROUGH 6AM. /SB  
 

 
   
AVIATION
 
 
06Z: MODERATE SNOWS WILL CONTINUE TO IMPACT KGEG/KSFF/KCOE/KPUW  
THROUGH 10Z...THEN WE COULD SEE A TRANSITION TO RAIN OR RAIN/SNOW  
MIX. THIS IS SLOWER BY ABOUT 2 HOURS THAN PREVIOUS FORECAST AND THERE  
IS A POTENTIAL THIS DOES NOT SWITCH AT KGEG/KCOE. PRECIPITATION  
HAS BEEN ALL RAIN AT KMWH AND MIX OF RAIN/SNOW AT KEAT WITH BRIEF  
ICE PELLETS OR FREEZING RAIN. PRECIPITATION WILL END BY 10Z NEAR  
KEAT/KMWH BUT THEN THE FOCUS WILL BE ON GUSTY WINDS NEAR KEAT  
WITH WIND SHEER AFTER 10Z WHILE GUSTY WINDS LOOK TO REACH THE  
SURFACE FROM KPUW TO KLWS. AS PRECIPITATION WANES...AREAS OF LOW  
STRATUS WILL BE LIKELY WITH SOME CLEARING EXPECTED WED AFTERNOON.  
AFTER 00Z...LOOK FOR LOW CLOUDS AND FOG TO RETURN TO MOST SITES  
RENEWING THE THREAT FOR RESTRICTIONS. /SB  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SPOKANE 32 37 24 36 30 36 / 100 70 0 10 0 0  
COEUR D'ALENE 32 37 25 35 31 36 / 100 90 0 10 10 0  
PULLMAN 30 39 29 39 31 38 / 100 60 10 10 10 0  
LEWISTON 36 48 36 45 35 45 / 100 60 10 10 0 0  
COLVILLE 31 39 22 39 25 40 / 100 80 0 10 0 0  
SANDPOINT 32 36 27 35 30 36 / 100 90 0 10 20 10  
KELLOGG 30 37 29 37 33 37 / 100 100 10 20 20 10  
MOSES LAKE 34 44 29 42 29 42 / 100 10 0 0 0 0  
WENATCHEE 32 40 32 40 31 42 / 70 30 0 0 0 0  
OMAK 32 38 26 37 28 39 / 80 50 0 0 0 0  
 

 
   
OTX WATCHES/WARNINGS/ADVISORIES
 
 
ID...WINTER STORM WARNING UNTIL 4 PM PST WEDNESDAY FOR CENTRAL  
PANHANDLE MOUNTAINS.  
 
WINTER WEATHER ADVISORY UNTIL 4 AM PST WEDNESDAY FOR LEWIS AND  
SOUTHERN NEZ PERCE COUNTIES.  
 
WINTER STORM WARNING UNTIL 4 AM PST WEDNESDAY FOR IDAHO PALOUSE.  
 
WINTER STORM WARNING UNTIL 10 AM PST WEDNESDAY FOR COEUR D'ALENE  
AREA-NORTHERN PANHANDLE.  
 
WA...WINTER WEATHER ADVISORY UNTIL MIDNIGHT PST TONIGHT FOR EAST  
SLOPES NORTHERN CASCADES.  
 
WINTER WEATHER ADVISORY UNTIL 4 AM PST WEDNESDAY FOR NORTHEAST  
BLUE MOUNTAINS.  
 
WINTER STORM WARNING UNTIL 10 AM PST WEDNESDAY FOR NORTHEAST  
MOUNTAINS.  
 
WINTER WEATHER ADVISORY UNTIL MIDNIGHT PST TONIGHT FOR OKANOGAN  
HIGHLANDS-OKANOGAN VALLEY-UPPER COLUMBIA BASIN.  
 
WINTER WEATHER ADVISORY UNTIL 4 AM PST WEDNESDAY FOR SPOKANE  
AREA-WASHINGTON PALOUSE.  
 

 
 

 
 
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