Flash Flood Warning 10, NWS Spokane, WA

494 
WGUS76 KOTX 252227
FFSOTX

Flash Flood Statement
National Weather Service Spokane WA
327 PM PDT Fri Sep 25 2026

WAC047-252237-
/O.EXP.KOTX.FF.W.0010.000000T0000Z-260925T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Okanogan WA-
327 PM PDT Fri Sep 25 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 330 PM PDT THIS AFTERNOON FOR
NORTH CENTRAL OKANOGAN COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.

&&

LAT...LON 4887 11960 4880 11966 4875 11963 4876 11951
      4886 11950 4887 11955

$$

Area Forecast Discussion
National Weather Service Spokane WA
1113 AM PDT Fri Sep 25 2026

.KEY MESSAGES...
- A system brings stronger winds and an increasing risk for
  rain, thunderstorms, and high mountain snow today and tonight.

- Possible frost late Saturday night and Sunday morning over
  eastern Washington and Idaho Panhandle mountain valleys, as
  well the outlying areas around the Spokane area and Palouse.

&&

.SYNOPSIS...
A strong system today will bring gusty winds, rain and along
with chance of thunderstorms, and high mountain snow.
Temperatures will trend cooler. A dry, fall like pattern
expected for start of next week. Some patchy frost is possible
this weekend.

&&

.DISCUSSION...
     WINDY CONDITIONS TODAY...

Today and tonight: A low pressure system and cold front coming
ashore over western Washington and Oregon this morning will
sweep through the Pacific Northwest and bring rains, high
mountain snow, a small chance of thunderstorms and windy
conditions. This low loses definition inland later this
morning, but a secondary surface low deepens over southwest
Alberta. That and high pressure nosing into southwest Washington
will increase pressure gradients across the Inland Northwest.
Overall, expect strong southwest winds around 20-30 mph with
gusts around 40-50 mph late this morning through this evening.
Winds will start to relax around sunset and surface based
instability will erode as surface inversions form. Chances for
high mountain snow are limited to the Cascades above 5000 feet
late this afternoon through tonight.

The cold front passage this morning and early afternoon will
bring light rain to much of the region. By sunrise, the band of
precipitation will be sweeping through the Columbia Basin. This
band of precipitation along and ahead of the cold front will
have moved through most of the region by 4 PM, leaving a
conditionally unstable air mass behind it. The 500 mb cold pool
will overspread the area in the late morning and early
afternoon, with temperatures around -19 to -21C. Surface-based
CAPE will quickly increase to around 200-500 J/kg into the
afternoon. Showers will form across much of the region, bringing
the chance (10-30%) for thunderstorms, particularly near the
Canadian border. Associated threats would be brief heavy rain
(minor burn scar threat in the Cascades), gusty winds up to
50 mph (although background winds will already be strong),
small hail, and isolated to scattered lightning. Strong winds
from thunderstorm outflows and the broader-scale strong winds
will bring a risk for blowing dust across the Columbia Basin
this afternoon. The HREF 10th to 90th total precipitation for
Moses Lake through early this afternoon is only 0.04-0.12
inches, likely not enough to completely stop blowing dust.

There is a 40-60% chance of 1 inch of snow in the Enchantments
of southwest Chelan County and Washington Pass through Saturday
morning. Temperatures tonight will be much cooler in the low 30s
to mid 40s as the post frontal airmass looks dry (PWATs
50-80%).

Saturday through Thursday: Conditions look precipitation-free
through Monday as the dry airmass over the Inland Northwest
stays put. High temperatures will be near normal to slightly
below normal in the 60s. Many locations in the northern valleys
and even parts of the Spokane area to Palouse will see their
first frost or freeze with this pattern, so wrap up those
gardens. We will keep a close eye on Saturday night into Sunday
morning for frost and we may have to consider highlights. Clouds
increase Monday evening with the next system. That system will
bring beneficial rains and high mountain snow primarily to the
Cascades and north Idaho thanks to strong zonal flow. There is a
40-60% chance of 0.5 inches of rain near the Cascade crest and
a 5-10% chance for the Idaho Panhandle from Tuesday morning to
Wednesday morning. Conditions look cool, but dry after this
system with minor shortwave ridging mid to late week.
/DB/Solveig

.AVIATION...
18Z TAFS: A passing front is bringing a band of rain currently
stretching along extreme eastern WA. It is impacting GEG- SFF-
COE- KPUW- KLWS. Gusty winds are occurring along and behind the
front. Along the for winds are in the southwest in the teens
with gusts into the 20-30 kt range. There is a chance of MVFR
cigs (20-40%) for KSFF-KPUW-KCOE through 21z with the rain.
Winds will continue to strengthen for afternoon. Sustained winds
will peak into the 20s with gusts in the 30-40 kt range.
Thunderstorm chances will be found over the northern counties,
from Okanogan County to north ID with chances in places like
Omak, Colville, Sandpoint and Bonners Ferry. Some chances may
also be found over the Columbia Basin, with risk possibly
skimming across KGEG to KCOE from 21-03Z, but the risk is too
small to include in the TAFs. Winds will slowly decrease through
the overnight, early Saturday morning period.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: High confidence
in VFR conditions. Low to moderate confidence in MVFR conditions
at KSFF-KCOE-KPUW. Low confidence in -tsra and blowing dust at
TAF sites. /JDC
-----------------------

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        63  41  61  38  66  39 /  90   0   0   0   0   0
Coeur d'Alene  62  42  59  39  65  39 / 100  10   0   0   0   0
Pullman        63  38  58  35  64  38 / 100   0   0   0   0   0
Lewiston       70  44  64  42  67  45 /  90   0   0   0   0   0
Colville       64  34  64  32  68  33 / 100  20   0   0   0   0
Sandpoint      62  38  57  35  64  35 / 100  50   0   0   0   0
Kellogg        62  40  55  36  63  39 / 100  30   0   0   0   0
Moses Lake     66  39  65  39  68  38 /  90   0   0   0   0   0
Wenatchee      66  46  64  46  67  46 /  80  10   0   0   0   0
Omak           64  40  65  40  67  41 / 100  20   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
WA...Wind Advisory until 9 PM PDT this evening for Lower Garfield
     and Asotin Counties-Moses Lake Area-Northeast Blue
     Mountains-Spokane Area-Upper Columbia Basin-Washington
     Palouse-Waterville Plateau.
     Blowing Dust Advisory until 7 PM PDT this evening for Moses
     Lake Area.
ID...Wind Advisory until 9 PM PDT this evening for Coeur d'Alene
     Area-Idaho Palouse.

&&

Special Weather Statement
National Weather Service Spokane WA
124 PM PDT Fri Sep 25 2026

WAZ049-252115-
Western Okanogan County WA-
124 PM PDT Fri Sep 25 2026

...A strong thunderstorm will impact portions of central Okanogan
County through 215 PM PDT...

At 124 PM PDT, Doppler radar was tracking a strong thunderstorm 24
miles west of Omak, moving northeast at 10 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of central Okanogan
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4847 12002 4850 12012 4868 12009 4861 11980
TIME...MOT...LOC 2024Z 203DEG 10KT 4854 12002

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Butler

Special Weather Statement
National Weather Service Spokane WA
128 PM PDT Fri Sep 25 2026

WAZ043-049-252115-
Western Okanogan County WA-Okanogan Valley WA-
128 PM PDT Fri Sep 25 2026

...A strong thunderstorm will impact portions of north central
Okanogan County through 215 PM PDT...

At 128 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Tonasket moving north at 25 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to outdoor objects is
         possible.

Locations impacted include...
Oroville, Loomis, and Cordell.

This includes U.S. Highway 97 in Washington between mile markers 325
and 332.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4894 11931 4864 11960 4867 11977 4894 11971
      4895 11931
TIME...MOT...LOC 2028Z 199DEG 22KT 4870 11965

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Butler

Special Weather Statement
National Weather Service Spokane WA
129 PM PDT Fri Sep 25 2026

WAZ043-049-252115-
Western Okanogan County WA-Okanogan Valley WA-
129 PM PDT Fri Sep 25 2026

...A strong thunderstorm will impact portions of north central
Okanogan County through 215 PM PDT...

At 128 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Tonasket moving north at 25 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to outdoor objects is
         possible.

Locations impacted include...
Oroville, Loomis, and Cordell.

This includes U.S. Highway 97 in Washington between mile markers 325
and 332.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4894 11931 4864 11960 4867 11977 4894 11971
      4895 11931
TIME...MOT...LOC 2028Z 199DEG 22KT 4870 11965

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Butler