982
FXUS66 KOTX 180623
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
1023 PM PST TUE DEC 17 2024
SYNOPSIS
A STRONG SURGE OF MOISTURE OVERNIGHT WILL PRODUCE SNOW AND POCKETS
OF FREEZING RAIN TONIGHT AND RAIN AND SNOW FOR EASTERN WASHINGTON
AND NORTH IDAHO. THE PASSAGE OF A COLD FRONT ON WEDNESDAY WILL
CREATE WIND GUSTS AS HIGH AS 50 MPH ACROSS THE PALOUSE AND
COLUMBIA BASIN. THE REST OF THE WEEK WILL FEATURE MILD
TEMPERATURES AND A TREND OF MORE WET WEATHER TOWARDS THE WEEKEND
INTO NEXT WEEK.
DISCUSSION
AS OF 10 PM, THE HEAVIEST SNOW ACCUMULATIONS IN CENTRAL WASHINGTON
HAD ENDED. SNOW AMOUNTS OF 12 TO 17 INCHES WERE REPORTED AROUND
LEAVENWORTH AND PLAIN BEFORE SNOW CHANGED TO FREEZING RAIN MID
EVENING. THE SLOWER THAN EXPECTED CHANGE WILL LIMIT THE FREEZING
RAIN POTENTIAL TO A QUARTER INCH OR LESS FOR THE REMAINDER OF THE
NIGHT. WINTER WEATHER ADVISORIES WERE ADDED TO THE NORTH IDAHO
PANHANDLE AND NORTHEAST WASHINGTON INCLUDING COLVILLE, CHEWELAH,
METALINE, DEER PARK, BONNERS FERRY, AND SANDPOINT. SNOW LEVELS
REMAINED DOWN TO THE VALLEY FLOORS THROUGH THE EVENING ALLOWING 1
TO 4 INCH ACCUMULATIONS IN THESE NORTHERN VALLEYS. /GKOCH
AVIATION
06Z TAFS: WARM FRONTAL PRECIPITATION WILL CLEAR THE SPOKANE, COEUR
D'ALENE, AND PULLMAN AIRPORTS BY 08Z. ONCE IN THE WARM SECTOR, LOW
LEVEL WIND SHEAR WILL INCREASE ACROSS THE SOUTHERN IDAHO PANHANDLE
AND THE EASTERN THIRD OF WASHINGTON. THE MIXING ASSOCIATED WITH
INCREASING WINDS SHOULD BREAK UP THE LOW STRATUS UNTIL THE COLD
FRONT ARRIVES BETWEEN 12-16Z. ANOTHER BRIEF PERIOD OF RAIN WILL
SPREAD ACROSS EASTERN WASHINGTON AND NORTH IDAHO FOLLOWED BY GUSTY
WEST WINDS. GUST OF 30 TO 35KTS ARE EXPECTED FOR KGEG, KPUW, KSFF,
AND KLWS FROM LATE MORNING THROUGH LATE AFTERNOON.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: LOW CONFIDENCE OF
WHEN CEILINGS WILL LIFT AROUND MOSES LAKE AND WENATCHEE. THE HREF
SUGGESTS ENOUGH WARM SECTOR MIXING PRIOR TO 12Z FOR IMPROVING
CONDITIONS, BUT IT MAY BE AFTER COLD FRONTAL PASSAGE (15Z) BEFORE
WEST WINDS DISPERSE THE LOW CLOUDS AND AREAS OF FOG. /GKOCH
-----------------------
CONFIDENCE DESCRIPTORS:
LOW - LESS THAN A 30 PERCENT CHANCE
MODERATE - 30 TO 70 PERCENT CHANCE
HIGH - GREATER THAN A 70 PERCENT CHANCE
FOR ADDITIONAL PROBABILISTIC INFORMATION FOR NWS SPOKANE AIRPORTS,
PLEASE REFER TO THE AVIATION DASHBOARD ON OUR WEBPAGE:
HTTPS:/WWW.WEATHER.GOV/OTX/AVNDASHBOARD
PRELIMINARY POINT TEMPS/POPS
SPOKANE 34 46 30 39 32 41 / 80 100 0 0 10 0
COEUR D'ALENE 33 45 29 41 32 43 / 90 100 0 0 10 0
PULLMAN 35 46 30 42 33 44 / 40 100 0 0 10 0
LEWISTON 40 53 33 46 36 48 / 20 90 0 0 0 0
COLVILLE 28 44 23 36 30 40 / 100 100 0 10 20 0
SANDPOINT 31 42 28 37 31 40 / 100 100 0 10 20 0
KELLOGG 33 42 30 42 33 44 / 100 100 0 0 10 0
MOSES LAKE 35 49 28 42 33 43 / 40 50 0 0 10 0
WENATCHEE 31 44 29 37 32 40 / 60 60 0 10 10 0
OMAK 32 44 25 37 32 40 / 80 80 0 10 20 0
OTX WATCHES/WARNINGS/ADVISORIES
ID...WINTER WEATHER ADVISORY UNTIL 4 AM PST WEDNESDAY FOR NORTHERN
PANHANDLE.
WIND ADVISORY FROM 4 AM TO 1 PM PST WEDNESDAY FOR COEUR D'ALENE
AREA-IDAHO PALOUSE.
WA...WINTER WEATHER ADVISORY UNTIL 4 AM PST WEDNESDAY FOR CENTRAL
CHELAN COUNTY-NORTHEAST MOUNTAINS-OKANOGAN HIGHLANDS-
OKANOGAN VALLEY-WATERVILLE PLATEAU-WENATCHEE AREA-WESTERN
OKANOGAN COUNTY.
WIND ADVISORY FROM 4 AM TO 1 PM PST WEDNESDAY FOR LOWER GARFIELD
AND ASOTIN COUNTIES-SPOKANE AREA-UPPER COLUMBIA BASIN-
WASHINGTON PALOUSE-WATERVILLE PLATEAU.
WINTER STORM WARNING UNTIL 4 AM PST WEDNESDAY FOR WESTERN CHELAN
COUNTY.
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