912
FXUS66 KOTX 090734
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
1234 AM PDT TUE SEP 9 2025
KEY MESSAGES
- SHOWERS AND THUNDERSTORMS EXPANDING ACROSS THE REGION TUESDAY
THROUGH THURSDAY.
- AREAS OF SMOKE AND HAZE THROUGH THE WEEK, ESPECIALLY NEAR
WILDFIRES.
SYNOPSIS
THE CHANCE FOR SHOWERS AND THUNDERSTORMS ACROSS THE REGION WILL
INCREASE TUESDAY THROUGH THURSDAY. WHILE SOME AREAS HAVE SEEN AN
IMPROVEMENT IN AIR QUALITY, AREAS OF SMOKE AND HAZE IS EXPECTED
TO CONTINUE THROUGH THE WEEK, ESPECIALLY NEAR WILDFIRES.
DISCUSSION
TODAY THROUGH THURSDAY: THE LOW PRESSURE SYSTEM OFF THE COAST OF THE
PNW WILL CONTINUE MAKING ITS WAY EASTWARD INTO THE AREA, BRINGING
MOISTURE AND UNSETTLED WEATHER TO THE REGION FOR THE NEXT FEW DAYS.
DAYS WITH BEST CHANCES OF WETTING RAINS INCLUDE TODAY AND THURSDAY,
THOUGH THERE ARE CHANCES FOR WIDESPREAD BUT VERY LIGHT SHOWERS ON
WEDNESDAY. LATER THIS MORNING, THERE IS A 20-40 PERCENT CHANCE OF
WETTING RAINS (0.10 INCHES OR MORE) IN THE CASCADES. ON THURSDAY,
THE LEWISTON, PULLMAN, CAMAS PRAIRIE, BLUES, AND CENTRAL IDAHO
AREAS HAVE A 50 PERCENT CHANCE OR MORE OF SEEING WETTING RAINS.
WITH THE LIFT AND INSTABILITY PROVIDED BY THE LOW, TODAY THROUGH
THURSDAY SEE CONTINUED WIDESPREAD CHANCES (10-20 PERCENT) FOR
AFTERNOON AND EVENING THUNDERSTORMS. AREAS WHERE RAINFALL
AMOUNTS ARE HIGHER HAVE A BETTER CHANCE (20 PERCENT AND ABOVE)
AT SEEING SOME STRONGER THUNDERSTORMS. WHILE PWATS THROUGH
THURSDAY WILL BE 100-150 PERCENT OF NORMAL, THEY INCREASE TO
150-200 PERCENT OF NORMAL ON THURSDAY. THESE WETTER
THUNDERSTORMS COULD BRING LOCALIZED HEAVY RAINFALL RATES IN
ADDITION TO GUSTY WINDS AND SMALL HAIL. BURN SCARS MAY HAVE TO
BE MONITORED FOR ANY FLASH FLOODING CONCERNS SHOULD ANY STRONGER
THUNDERSTORMS MOVE OVER THEM. TEMPERATURES TODAY AND TOMORROW
WILL BE IN THE MID 80S, BUT THEN WILL COOL DOWN TO THE MID TO
HIGH 70S BY THURSDAY, WHICH IS RIGHT AROUND NORMAL FOR THIS TIME
OF YEAR. RELATIVE HUMIDITIES WILL ALSO IMPROVE THROUGH THE
WEEK.
FRIDAY THROUGH SUNDAY: WITH PWATS CONTINUING TO BE 150-200 PERCENT
OF NORMAL THROUGH NEXT WEEKEND, CHANCES OF MORE WIDESPREAD WETTING
RAINS INCREASE SATURDAY THROUGH SUNDAY. THERE WILL BE A BRIEF
TRANSITION ON SATURDAY BETWEEN THE CURRENT LOW MOVING OUT OF THE
AREA AND ANOTHER LOW MOVING IN RIGHT BEHIND IT. TEMPERATURES WILL
INCREASE SLIGHTLY ON SATURDAY, BUT WILL COME RIGHT DOWN ON SUNDAY AS
THE LOW MAKES ITS WAY INLAND. CLUSTER ANALYSIS SEEMS TO FAVOR THIS
AS WELL, WITH LOWER HEIGHTS MOVING OVER THE AREA FOR ALL CLUSTERS.
THE LOCATION OF WHERE THESE LOWER HEIGHTS WILL BE IS STILL UNCLEAR.
TEMPERATURES WILL CONTINUE LOWERING SLIGHTLY AND INTO THE MID 70S
OVER THE WEEKEND. EARLY NEXT WEEK HAS MUCH LESS CLUSTER AGREEMENT,
BUT EARLY SIGNALS ARE BEGINNING TO SHOW HIGHER HEIGHTS AND A SLIGHT
INCREASE IN TEMPERATURES.
SMOKE AND HAZE, ESPECIALLY NEAR WILDFIRES, IS EXPECTED TO
CONTINUE THROUGH THE WEEK. AN AIR QUALITY ALERT HAS BEEN ISSUED
FOR PARTS OF WASHINGTON AND IDAHO AND CURRENTLY GO THROUGH
MIDDAY THURSDAY. /AS
AVIATION
06Z TAFS: HIT AND MISS SHOWERS AND THUNDERSTORMS WILL BE OF
CONCERN FOR MOST TERMINALS FOR THE NEXT 24 HOURS. CELLS COULD
CONTAIN GUSTY OUTFLOW WINDS UP TO 30 KT. THE BEST CHANCES FOR
THUNDERSTORMS WILL BE IN THE CASCADES (KEAT-KS52) FROM 21-03Z.
CEILINGS WILL STAY AT VFR FOR THE FORECAST PERIOD.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: HIGH CONFIDENCE
IN VFR CONDITIONS. LOW CONFIDENCE OF TERMINALS BEING HIT BY
SHOWERS AND THUNDERSTORMS.
-----------------------
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:/WEATHER.GOV/OTX/AVNDASHBOARD
PRELIMINARY POINT TEMPS/POPS
SPOKANE 85 57 84 58 78 56 / 20 20 10 30 40 40
COEUR D'ALENE 86 58 84 59 78 56 / 10 20 20 40 50 50
PULLMAN 80 52 79 53 73 51 / 20 30 20 70 50 50
LEWISTON 85 62 85 62 78 60 / 20 30 20 70 60 50
COLVILLE 85 46 85 47 80 46 / 30 20 20 20 50 30
SANDPOINT 83 52 83 54 76 51 / 20 20 20 40 60 60
KELLOGG 84 57 82 59 75 56 / 30 30 20 70 70 70
MOSES LAKE 83 56 84 57 80 55 / 50 20 20 20 40 20
WENATCHEE 80 61 84 63 83 61 / 60 20 30 20 40 20
OMAK 85 58 88 61 85 59 / 40 20 10 10 30 20
OTX WATCHES/WARNINGS/ADVISORIES
WA...AIR QUALITY ALERT UNTIL NOON PDT THURSDAY FOR CENTRAL CHELAN
COUNTY-MOSES LAKE AREA-NORTHEAST MOUNTAINS-OKANOGAN
HIGHLANDS-OKANOGAN VALLEY-UPPER COLUMBIA BASIN-WATERVILLE
PLATEAU-WENATCHEE AREA-WESTERN CHELAN COUNTY.
ID...AIR QUALITY ALERT UNTIL 10 AM PDT THIS MORNING FOR NORTHERN
PANHANDLE.
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