839
FXUS66 KOTX 161847
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
1047 AM PST SUN FEB 16 2025
SYNOPSIS
SNOW WILL CONTINUE ACROSS MANY AREAS THROUGH MONDAY. STORM TOTAL
ACCUMULATIONS WILL BE MORE SIGNIFICANT AND WIDESPREAD. ANOTHER
GOOD CHANCE OF WIDESPREAD SNOW AND RAIN IS EXPECTED WEDNESDAY.
TEMPERATURES BY LATE WEEK WARM INTO THE UPPER 30S AND LOW 40S.
DISCUSSION
MORNING UPDATE: HAVE MADE SEVERAL UPDATES TO THE ONGOING WINTER
WEATHER ADVISORIES AND WINTER STORM WARNINGS. WITH CONTINUED
MOISTURE FEEDING INTO THE REGION FROM THE WEST, AND WEAK FORCING
FROM A TROUGH DROPPING DOWN FROM THE NORTH, SNOW IS EXPECTED TO
LINGER INTO MONDAY OVER MUCH OF THE REGION, ALTHOUGH MID LEVEL
WEST TO NORTHWEST FLOW WILL FAVOR THE MOST PERSISTENT ACTIVITY
ALONG THE CASCADE CREST, ID PANHANDLE, AND SE WASHINGTON WHILE
CENTRAL WA AMOUNTS WILL BE LIGHT. THERE IS ALSO ENHANCED
ISENTROPIC ASCENT OCCURRING AROUND THE SPOKANE/COEUR D'ALENE AREA
WITH A WEAK BOUNDARY OVER THE AREA. THUS HAVE EXTENDED MANY OF THE
ADVISORIES INTO MONDAY MORNING, EXCEPT INTO MONDAY EVENING FOR
THE WA PALOUSE WHERE THE UPSLOPE WEST-NORTHWEST FLOW ON MONDAY
WILL KEEP THE SNOW GOING. THE ADVISORY FOR THE CAMAS PRAIRIE WAS
ALSO UPGRADED TO A WARNING. MOST OF THE MORE SIGNICANT IMPACTS ON
THE CAMAS PRAIRIE ARE EXPECTED ON MONDAY AS SNOW INTENSITY
INCREASES AS THE UPSLOPE WEST-NORTHWEST FLOW DEVELOPS ALONG WITH A
MID LEVEL WAVE DROPPING INTO THE REGION. AND WITH THIS, SNOW IS
EXPECTED TO CONTINUE IN THE BLUE MOUNTAINS THROUGH MONDAY NIGHT AS
WELL. THUS BOTH OF THESE WINTER STORM WARNINGS ARE IN PLACE
THROUGH 4 AM TUESDAY.
WITH THE PERSISTENT PRECIPITATION OVER NE WASHINGTON INTO THE ID
PANHANDLE THROUGH THE DAY, THIS IS EXPECTED TO HOLD TEMPERATURES
DOWN A FEW MORE DEGREES AND MADE A FEW ADJUSTMENTS TO HIGH
TEMPERATURES FOR TODAY. JW
AVIATION
18Z TAFS: WIDESPREAD LIGHT TO MODERATE SNOW IS EXPECTED TO PERSIST
THROUGH THE TAF PERIOD OVER MOST OF THE REGION, EXCEPT IN CENTRAL
WA WHERE DOWNSLOPE FLOW OFF THE CASCADES WILL RESULT IN MORE
INTERMITTENT SNOW SHOWERS. MILDER TEMPERATURES OVER LEWISTON WILL
ALSO SUPPORT MOSTLY RAIN INTO MONDAY. CIGS ARE VARYING ACROSS THE
REGION, RANGING FROM 400-3300 FEET AGL AT THE AIRPORTS AS OF 17Z
18Z THIS MORNING. BUT WITH ADDITIONAL PRECIPITATION AND LIGHT
WINDS CONDITIONS ARE EXPECTED TO BE PRIMARILY IFR AND MVFR.
LOCALIZED BANDS OF HEAVIER SNOW WILL PRODUCE LIFR CONDITIONS.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: THERE IS HIGH
CONFIDENCE THAT WIDESPREAD SNOW WILL CONTINUE ACROSS EASTERN WA,
THE ID PANHANDLE AND THE CASCADE CREST. JW
-----------------------
CONFIDENCE DESCRIPTORS:
LOW - LESS THAN A 30 PERCENT CHANCE
MODERATE - 30 TO 70 PERCENT CHANCE
HIGH - GREATER THAN A 70 PERCENT CHANCE
PRELIMINARY POINT TEMPS/POPS
SPOKANE 31 30 35 22 36 22 / 100 90 70 30 10 10
COEUR D'ALENE 31 28 35 21 36 19 / 100 100 90 40 10 10
PULLMAN 33 31 34 27 34 27 / 80 100 90 70 50 20
LEWISTON 39 35 40 33 40 31 / 50 90 90 60 60 10
COLVILLE 31 24 37 21 38 20 / 60 80 50 20 10 10
SANDPOINT 32 26 33 18 34 18 / 90 100 90 40 30 10
KELLOGG 34 31 35 21 35 18 / 100 100 100 70 40 20
MOSES LAKE 35 29 38 26 38 28 / 30 20 10 0 10 10
WENATCHEE 31 29 37 29 36 29 / 50 20 10 10 10 20
OMAK 31 26 38 22 38 29 / 40 20 10 20 10 20
OTX WATCHES/WARNINGS/ADVISORIES
ID...WINTER WEATHER ADVISORY UNTIL 10 AM PST MONDAY FOR NORTHERN
PANHANDLE.
WINTER STORM WARNING UNTIL 4 AM PST TUESDAY FOR CENTRAL
PANHANDLE MOUNTAINS-COEUR D'ALENE AREA-IDAHO PALOUSE.
WINTER STORM WARNING UNTIL 4 AM PST TUESDAY FOR LEWIS AND
SOUTHERN NEZ PERCE COUNTIES.
WA...WINTER STORM WARNING UNTIL 4 AM PST TUESDAY FOR NORTHEAST BLUE
MOUNTAINS.
WINTER WEATHER ADVISORY UNTIL 11 AM PST THIS MORNING FOR LOWER
GARFIELD AND ASOTIN COUNTIES-UPPER COLUMBIA BASIN.
WINTER WEATHER ADVISORY UNTIL 10 PM PST MONDAY FOR WASHINGTON
PALOUSE.
WINTER WEATHER ADVISORY UNTIL 10 AM PST MONDAY FOR NORTHEAST
MOUNTAINS-OKANOGAN HIGHLANDS-SPOKANE AREA.
WINTER STORM WARNING UNTIL 10 AM PST MONDAY FOR WESTERN CHELAN
COUNTY.
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