Alert archive / Idaho / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 9, NWS Spokane, WA

September 25, 2024Kootenai County, Idaho; Spokane County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at Sep 25, 2024, 4:51 PM PDT for Kootenai County, Idaho; Spokane County, Washington. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 25, 2024, 4:51 PM PDT (23:51 UTC)
Expired: Sep 25, 2024, 5:30 PM PDT
In force: 39 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kootenai County, ID, Spokane County, WA

The radar

The Spokane radar (KOTX), 57 km from the middle of the area, began a volume at 23:53 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 11.9 hours before the alert went out and 41 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2121 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

114 
WUUS56 KOTX 252351
SVROTX
IDC055-WAC063-260030-
/O.NEW.KOTX.SV.W.0009.240925T2351Z-240926T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Spokane WA
451 PM PDT Wed Sep 25 2024

The National Weather Service in Spokane has issued a

* Severe Thunderstorm Warning for...
  Kootenai County in the Panhandle of Idaho...
  East central Spokane County in northeastern Washington...

* Until 530 PM PDT.

* At 450 PM PDT, a severe thunderstorm was located 11 miles west of
  Harrison, or 16 miles southeast of Spokane Valley, moving northeast
  at 40 mph.

  HAZARD...60 mph wind gusts and penny size hail. Areas of blowing 
           dust producing brief visibility reductions near one 
           quarter mile.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Coeur d'Alene, Post Falls, Hayden, Rathdrum, Dalton Gardens, Hayden
  Lake, Fourth Of July Pass, Rockford, Fernan Lake Village, Huetter,
  Beauty Creek Campground, and Wolf Creek Campground.

This includes the following highways...
 Interstate 90 in Idaho between mile markers 5 and 30.
 U.S. Highway 95 in Idaho between mile markers 405 and 441.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4737 11704 4746 11717 4788 11682 4764 11640
TIME...MOT...LOC 2350Z 222DEG 34KT 4747 11703 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fewkes

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Spokane, WA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 25, 2:31 PM PDT, 2 hours 20 minutes earlier.

Area forecast discussion, Sep 25, 2:31 PM PDT, 2 hours 20 minutes before

Area Forecast Discussion
National Weather Service Spokane WA
231 PM PDT Wed Sep 25 2024

.SYNOPSIS...

Strong winds accompany a cold front passage through the late
evening. Areas of blowing dust along with showers and
thunderstorms will be possible with the frontal passage.
Temperatures return to near normal by Thursday with another cold
front passage Friday. Above average temperatures return Saturday
into early next week, with Saturday the warmest day of the
weekend. Some freezing overnight lows are possible again heading
into next week.

&&

.DISCUSSION...
Tonight through Thursday: The evening will start active with the
cold front pushing through the region. Winds will continue to be
main concern. Isolated thunderstorms embedded along the front will
be sporadic lightning and gusty outflow winds. Wind speeds will
20-30 MPH sustained with gusts near 40 MPH. By 11 PM, the cold
front will mainly be impacting extreme Eastern Washington and the
Idaho Panhandle. By early Thursday morning, the thunderstorms are
expected to be no longer occurring. Winds will begin to decline
as a zonal flow pattern begins to take hold and the gradient
loosens through the day. Afternoon winds are expected to be breezy
through the Okanogan Valley with sustained 10-20 MPH and gusts
near 35 possible.

On the plus side, temperatures are expected to decrease by 10-15
degrees from Wednesday highs. The highs across the region are
expected to be in the 60s to low 70s. Overnight lows will be in
the upper 40s and 50s.

Friday through Wednesday:
Expect zonal flow late in the week, with generally dry conditions
returning and daytime temps near to slightly above daily normals.
Synoptic outlook turns murkier early next week with occasional
shortwaves likely to push through the progressive weather pattern.
Have introduced slight chances for showers Tuesday/Wednesday, but
these are mostly confined to the mountains for now...something to
watch. Frost/freezing conditions possible next Monday and Tuesday as
well in our northern sheltered valleys. In all, not much reason to
stray from near normal daytime temps through the end of the extended
forecast. /KD

&&

.AVIATION...
18Z TAFS: The front is starting to press into the Cascades. The
front will move over the Cascades around 21z bringing increasing
winds and an increasing chance of showers and thunderstorms. The
winds are expected to develop areas of blowing dust which will
lower visibilities into the MVFR category and possibly IFR,
however dust forecasting is tough to pin down. If dust develops,
the worst visibilities are expected over the Columbia Basin near
MWH and points NE of there. The front will also bring a chance of
showers and thunderstorms, however the main thunderstorm threat
will occur north and east of GEG-COE as well as south of LWS so we
did not mention prevailing thunder in the TAFs. The threat of
showers/thunderstorms will decrease rapidly after 06z for all
locations save the extreme eastern portions of the ID Panhandle.
By 12Z, dry air behind the front will bring clear skies and VFR
conditions for the start of Thursday.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: There is high
confidence of VFR conditions for all TAF sites through 21z After
that blowing dust is expected to lower visibility down to MVFR
across the Columbia Basin, with localized restrictions down to IFR.
Confidence is low with degree of visibility restrictions at
KMWH/KGEG/KSFF/KPUW and possibly LWS.

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        46  68  50  75  46  79 /  40   0   0   0   0   0
Coeur d'Alene  46  67  47  74  47  77 /  50   0   0   0   0   0
Pullman        44  65  45  72  46  77 /  50   0   0   0   0   0
Lewiston       54  73  53  80  54  83 /  70   0   0   0   0   0
Colville       36  68  39  74  36  75 /  60   0  10   0   0   0
Sandpoint      44  64  44  72  43  72 /  60   0  10   0   0   0
Kellogg        48  64  51  70  51  78 /  90   0   0   0   0   0
Moses Lake     43  70  47  77  44  77 /  30   0   0   0   0   0
Wenatchee      48  70  54  74  50  74 /  20   0  10   0   0   0
Omak           43  70  49  77  47  77 /  20  10  10   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Wind Advisory until 11 PM PDT this evening for Central Panhandle
     Mountains-Coeur d'Alene Area-Idaho Palouse-Lewiston Area-
     Northern Panhandle.

WA...Wind Advisory until 11 PM PDT this evening for Lower Garfield
     and Asotin Counties-Northeast Blue Mountains-Northeast
     Mountains-Okanogan Highlands-Okanogan Valley-Wenatchee Area.

     Blowing Dust Advisory until 11 PM PDT this evening for Moses
     Lake Area-Spokane Area-Upper Columbia Basin-Washington
     Palouse-Waterville Plateau.

&&

In the hours before

Special weather statement, Sep 25, 3:08 PM PDT, 1 hour 43 minutes before

Special Weather Statement
National Weather Service Spokane WA
308 PM PDT Wed Sep 25 2024

WAZ031>033-252300-
Northeast Blue Mountains WA-Washington Palouse WA-
Lower Garfield and Asotin Counties WA-
308 PM PDT Wed Sep 25 2024

...A line of showers producing gusty outflow winds will impact
portions of southeastern Adams, Garfield, southern Whitman and
northwestern Asotin Counties through 400 PM PDT...

At 305 PM PDT, Doppler radar was tracking showers along a line
extending from near Ayer to 6 miles southeast of Dayton. Movement
was northeast at 45 mph.

HAZARD...Winds in excess of 40 mph.  Areas of blowing dust reducing
         visibility down to one mile.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Pomeroy, Endicott, Riparia, Hay, Dusty, Wawawai, Dodge, Winona, La
Crosse, Peola, Almota, and Mayview.

This includes U.S. Highway 12 in Washington between mile markers 389
and 423, and near mile marker 425.

These showers could mature into thunderstorms producing briefing
downpours and lightning strikes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4633 11762 4634 11768 4647 11774 4647 11786
      4662 11785 4661 11786 4658 11790 4659 11802
      4655 11817 4667 11823 4669 11822 4678 11810
      4678 11801 4685 11800 4703 11774 4645 11712
      4625 11761
TIME...MOT...LOC 2205Z 233DEG 40KT 4658 11834 4623 11791

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SB

Local storm report, Sep 25, 3:40 PM PDT, 1 hour 11 minutes before

Preliminary Local Storm Report
National Weather Service Spokane WA
340 PM PDT Wed Sep 25 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     Tstm Wnd Gst     5 ENE Washtucna         46.79N 118.21W
09/25/2024  M52 MPH          Adams              WA   Mesonet

            Mesonet station EW4908 Washtucna / Hooper.

&&

Local storm report, Sep 25, 3:57 PM PDT, 54 minutes before

Preliminary Local Storm Report
National Weather Service Spokane WA
357 PM PDT Wed Sep 25 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0340 PM     Dust Storm       Dusty                   46.81N 117.65W
09/25/2024                   Whitman            WA   Dept of Highways

            WSDOT webcam indicates low visibility due to
            blowing dust..estimated less than 1/4 mile.

&&

Special weather statement, Sep 25, 4:06 PM PDT, 45 minutes before

Special Weather Statement
National Weather Service Spokane WA
406 PM PDT Wed Sep 25 2024

WAZ033-035>037-252345-
Spokane Area WA-Upper Columbia Basin WA-Northeast Mountains WA-
Washington Palouse WA-
406 PM PDT Wed Sep 25 2024

...Strong thunderstorms will impact portions of northeastern Whitman,
northeastern Lincoln, southeastern Stevens, Spokane and south central
Pend Oreille Counties through 445 PM PDT...

At 405 PM PDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from 8 miles north of Davenport
to 7 miles south of Cheney. Movement was northeast at 65 mph.

HAZARD...Wind gusts up to 50 mph.  Areas of blowing dust producing
         visbibility to 1/4 mile.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Spokane, Spokane Valley, Cheney, Liberty Lake, Airway Heights,
Medical Lake, Nine Mile Falls, Deer Park, Millwood, Davenport, Otis
Orchards-East Farms, Fairwood, Suncrest, Fairchild AFB, Otis
Orchards, Dishman, Green Acres, Trentwood, Country Homes, and Town
And Country.

This includes the following highways...
 Interstate 90 in Washington between mile markers 256 and 298.
 U.S. Highway 2 in Washington between mile markers 248 and 323.
 U.S. Highway 195 in Washington between mile markers 64 and 95.
 U.S. Highway 395 in Washington between mile markers 165 and 203.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4824 11779 4807 11706 4772 11706 4721 11731
      4759 11826
TIME...MOT...LOC 2305Z 234DEG 55KT 4777 11813 4739 11756

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

SB

Local storm report, Sep 25, 4:17 PM PDT, 34 minutes before

Preliminary Local Storm Report
National Weather Service Spokane WA
417 PM PDT Wed Sep 25 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0408 PM     Dust Storm       3 NW Airway Heights     47.68N 117.63W
09/25/2024                   Spokane            WA   NWS Employee

            Winds gusting to 54 mph with near zero
            visibility due to blowing dust.

&&

Local storm report, Sep 25, 4:49 PM PDT, 2 minutes before

Preliminary Local Storm Report
National Weather Service Spokane WA
449 PM PDT Wed Sep 25 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0416 PM     Non-Tstm Wnd Gst 2 ENE Pullman           46.75N 117.12W
09/25/2024  M67 MPH          Whitman            WA   ASOS

            ASOS station KPUW Pullman/Moscow Airport.

0414 PM     Non-Tstm Wnd Gst 3 SE Airway Heights     47.62N 117.53W
09/25/2024  M61 MPH          Spokane            WA   ASOS

            ASOS station KGEG Spokane Intl Airport.

&&

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 25, 3:50 PM PDT	Dust Storm Warning	OTX	Benewah, Latah, Nez Perce	55 min
Sep 25, 3:58 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Lewis, Nez Perce	62 min
Sep 25, 4:03 PM PDT	Severe Thunderstorm Warning	OTX	Shoshone	40 min
Sep 25, 4:12 PM PDT	Dust Storm Warning	OTX	Benewah, Bonner, Kootenai	33 min
Sep 25, 4:17 PM PDT	Severe Thunderstorm Warning	OTX	Benewah, Kootenai, Latah, Nez Perce	58 min
Sep 25, 4:23 PM PDT	Severe Thunderstorm Warning	OTX	Bonner, Kootenai	67 min
Sep 25, 2:00 PM PDT	Special Weather Statement	OTX	Okanogan	30 min
Sep 25, 2:22 PM PDT	Special Weather Statement	OTX	Okanogan	23 min
Sep 25, 2:38 PM PDT	Severe Thunderstorm Warning	OTX	Okanogan	37 min
Sep 25, 3:08 PM PDT	Special Weather Statement	OTX	Garfield	52 min
Sep 25, 3:41 PM PDT	Severe Thunderstorm Warning	OTX	Asotin, Garfield, Whitman	64 min
Sep 25, 4:06 PM PDT	Dust Storm Warning	OTX	Adams	84 min
Sep 25, 4:06 PM PDT	Special Weather Statement	OTX	Spokane	39 min
Sep 25, 4:39 PM PDT	Severe Thunderstorm Warning	OTX	Spokane, Whitman	36 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2024 Severe Thunderstorm Warnings in Washington, 2024 Every severe thunderstorm warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.