682
FXUS66 KOTX 082030
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
130 PM PDT MON JUN 8 2026
KEY MESSAGES
- INCREASING RAIN THIS EVENING AND TONIGHT. 10-30% CHANCE OF
THUNDERSTORMS TUESDAY AFTERNOON.
- DRIER AND WARMER MIDWEEK THROUGH WEEKEND WITH POTENTIAL HEAT
RISK.
SYNOPSIS
A SYSTEM BRINGS RAIN INTO THE REGION MONDAY EVENING INTO
TUESDAY MORNING. TUESDAY WILL BE BREEZY WITH SHOWERS AND A
THREAT FOR ISOLATED THUNDERSTORMS. THE REST OF THE WEEK WILL BE
MOSTLY DRY, WITH WARMING TEMPERATURES. WIDESPREAD 80S TO LOW
90S ARE FORECAST BY THE WEEKEND.
DISCUSSION
TODAY AND TOMORROW: RAIN WILL BEGIN TO INCREASE THIS EVENING AS A
PLUME OF OF MOISTURE AHEAD OF A COLD FRONT SWINGS THROUGH THE
REGION. THE TROUGH AXIS IS CURRENTLY RIGHT OFF THE WA/OR COAST AND
THE RADAR IS FILLING IN WITH LIGHT RAIN DOWNSTREAM. SEEING SOME
RADAR RETURNS AS LOW AS 10000 FT AGL EAST OF THE CASCADES ALREADY
EARLY THIS AFTERNOON. IT WILL TAKE A COUPLE HOURS FOR THE BOUNDARY
LAYER TO MOISTEN FROM THE TOP DOWN. THIS WILL BRING SOME HIGHLY
BENEFICIAL RAINS TO THE ENTIRE REGION THROUGH TOMORROW. THE WELL
DEFINED SURFACE LOW AND COLD FRONT OFF THE COAST WILL LOSE ITS
DEFINITION AS IT MOVES INLAND TONIGHT, BUT HIGH PRESSURE NOSING IN
BEHIND THIS SYSTEM AND A LOW MEANDERING THROUGH CENTRAL CANADA WILL
INCREASE PRESSURE GRADIENTS FOR TUESDAY. THIS WILL LEAD TO BREEZY
WEST WINDS ACROSS THE INLAND NORTHWEST WITH SUSTAINED SPEEDS AROUND
15-30 MPH AND GUSTS AROUND 30-50 MPH. CONSIDERED WIND ADVISORIES FOR
THE WATERVILLE PLATEAU AND THE FOOTHILLS OF THE BLUE MOUNTAINS, BUT
WAS NOT CONFIDENT ENOUGH FOR A PERIOD OF 45+ MPH GUSTS LASTING MORE
THAN BRIEF SPURTS. AS THE STABLE BAND OF RAIN DEPARTS EARLY TOMORROW
MORNING, ATTENTION WILL TURN TO SHOWER AND THUNDERSTORM DEVELOPMENT
AS THE 500 MB COLD POOL MOVES OVERHEAD. IT IS NOT PARTICULARLY
IMPRESSIVE AROUND -20C SO FORECAST INSTABILITY IS ONLY AROUND 100-
300 J/KG EAST OF US-97. CELLS WILL BE CAPABLE OF PRODUCING 30-50 MPH
OUTFLOWS, PEA SIZE HAIL, ISOLATED LIGHTNING STRIKES, AND BRIEF HEAVY
RAIN. FROM 5 PM THIS EVENING TO 5 PM TOMORROW, THERE IS A 60-NEAR
100% CHANCE OF A QUARTER INCH OF RAIN FOR MOST LOCATIONS OUTSIDE OF
THE LOWER COLUMBIA BASIN. IN THE LOWER BASIN, THOSE CHANCES DECREASE
TO 30-50% CHANCE.
WEDNESDAY THROUGH MONDAY: WEDNESDAY WILL BE A TRANSITION DAY TOWARDS
WARMER WEATHER AS TROUGHING DEPARTS INTO MONTANA AND RIDGING STARTS
TO STRENGTHEN OFF THE PACIFIC COAST. SHOWERS LIMITED TO THE
MOUNTAINS WILL TAPER OFF THROUGH THE AFTERNOON AS HEIGHT RISES NOSE
INTO THE INLAND NORTHWEST. TEMPERATURES WILL STEADILY CLIMB THROUGH
THE REST OF THE WEEK AND INTO EARLY NEXT WEEK AS THE UPPER LEVEL
RIDGE STRENGTHENS OFF THE COAST. TEMPERATURES WILL TREND FROM THE
60S AND 70S WEDNESDAY TO THE MID 80S TO MID 90S BY NEXT MONDAY. THE
RISK FOR HEAT RELATED ILLNESS WILL STEADILY CLIMB THROUGH THE
WEEKEND AND INTO EARLY NEXT WEEK. /DB
AVIATION
18Z TAFS: EXPECT A GENERAL INCREASE IN CLOUDINESS INTO THE
AFTERNOON AS RAIN APPROACHES THE AREA. RAIN WILL DEVELOP OVER
KEAT-KMWH AROUND 23-01Z THIS AFTERNOON AND QUICKLY SPREAD EAST
TO KGEG-KSFF-KCOE-KPUW-KLWS AROUND 01Z-05Z THIS EVENING.
CEILINGS WILL TREND TOWARDS MVFR THIS EVENING INTO TONIGHT AS
RAIN DECREASES T/TD SPREADS.
FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS:
HIGH CONFIDENCE VFR CONDITIONS AT ALL TAF SITES THROUGH 00Z.
MODERATE CONFIDENCE IN MVFR CONDITIONS DEVELOPING BETWEEN 03-08Z
TONIGHT. THERE IS A LOW CONFIDENCE RISK (10-15%) FOR IFR
CONDITIONS BETWEEN 06-12Z AT KEAT/KMWH/KGEG/KSFF/KCOE.
-----------------------
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 47 63 43 65 43 71 / 100 90 20 0 0 0
COEUR D'ALENE 48 59 43 62 43 71 / 90 100 50 10 0 0
PULLMAN 45 59 41 60 39 68 / 100 70 60 10 0 0
LEWISTON 53 68 49 68 45 78 / 90 50 30 10 0 0
COLVILLE 42 63 36 68 38 74 / 100 100 80 10 0 0
SANDPOINT 46 56 41 60 42 70 / 90 100 80 30 0 0
KELLOGG 48 56 42 57 42 69 / 90 100 80 60 0 0
MOSES LAKE 46 70 42 72 41 78 / 90 30 0 0 0 0
WENATCHEE 53 67 48 70 48 79 / 90 40 0 0 0 0
OMAK 48 71 41 73 44 78 / 100 80 10 0 0 0
OTX WATCHES/WARNINGS/ADVISORIES
WA...NONE.
ID...NONE.
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