Alert archive / Idaho / Snow Squall Warnings in 2023

Snow Squall Warning 5, NWS Spokane, WA

February 21, 2023Kootenai County, Idaho

NWS Spokane, WA issued this snow squall warning at Feb 21, 2023, 2:47 PM PST for Kootenai County, Idaho. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 21, 2023, 2:47 PM PST (22:47 UTC)
Expired: Feb 21, 2023, 3:45 PM PST
In force: 58 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

County Kootenai County, ID

The radar

The Spokane radar (KOTX), 69 km from the middle of the area, began a volume at 22:49 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 10.8 hours before the alert went out and 23 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1097 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this snow squall 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 snow squall warning went out at Feb 21, 2:15 PM PST, 32 minutes earlier.

Area forecast discussion, Feb 21, 2:15 PM PST, 32 minutes before

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In the hours before

Local storm report, Feb 21, 9:26 AM PST, 5 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
926 AM PST TUE FEB 21 2023

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

0809 PM     NON-TSTM WND GST 13 ESE BAYVIEW          47.88N 116.30W
02/20/2023  M50 MPH          SHOSHONE           ID   MESONET

            MESONET STATION MAEI1 MAGEE PEAK.

1025 PM     NON-TSTM WND GST DUSTY                   46.81N 117.66W
02/20/2023  M50 MPH          WHITMAN            WA   MESONET

            MESONET STATION TDSTY DUSTY (WA DOT).

0400 AM     NON-TSTM WND GST 2 WNW MATTAWA           46.75N 119.94W
02/21/2023  M50 MPH          GRANT              WA   MESONET

            MESONET STATION HBVLY 2.3 W MATTAWA (HMMN).

0730 PM     NON-TSTM WND GST 3 NW MONSE              48.16N 119.73W
02/20/2023  M51 MPH          OKANOGAN           WA   MESONET

            MESONET STATION EW6379 BREWSTER.

1200 AM     NON-TSTM WND GST 2 SSE COULEE DAM        47.95N 118.95W
02/21/2023  M51 MPH          OKANOGAN           WA   MESONET

            MESONET STATION GCDW 1.9 SE COULEE DAM
            (AGRIMET).

0348 AM     NON-TSTM WND GST 5 E DOUGLAS             47.62N 119.90W
02/21/2023  M51 MPH          DOUGLAS            WA   MESONET

            MESONET STATION DOUW1 DOUGLAS.

0530 PM     NON-TSTM WND GST 4 SW GEORGE             47.04N 119.92W
02/20/2023  M53 MPH          GRANT              WA   MESONET

            MESONET STATION TSILI 3.7 SW GEORGE (WA
            DOT).

0835 PM     NON-TSTM WND GST 5 ESE GEORGE            47.04N 119.76W
02/20/2023  M53 MPH          GRANT              WA   MESONET

            MESONET STATION DVI03599 QUINCY.

0800 PM     NON-TSTM WND GST 3 NW LEAVENWORTH        47.63N 120.71W
02/20/2023  M55 MPH          CHELAN             WA   MESONET

            MESONET STATION TUM42 3.2 NW LEAVENWORTH
            (NWAVAL).

0900 PM     NON-TSTM WND GST 1 SE EPHRATA            47.30N 119.52W
02/20/2023  M55 MPH          GRANT              WA   ASOS

            ASOS STATION KEPH EPHRATA AIRPORT.

1242 AM     NON-TSTM WND GST 6 NNW MOSES LAKE        47.20N 119.32W
02/21/2023  M55 MPH          GRANT              WA   ASOS

            ASOS STATION KMWH GRANT COUNTY AIRPORT.

0652 PM     NON-TSTM WND GST 11 NNE PEOLA            46.44N 117.35W
02/20/2023  M56 MPH          GARFIELD           WA   MESONET

            MESONET STATION TALPO 10.8 NE PEOLA (WA
            DOT).

0915 PM     NON-TSTM WND GST POMEROY                 46.47N 117.60W
02/20/2023  M56 MPH          GARFIELD           WA   MESONET

            MESONET STATION DW6254 POMEROY.

1222 AM     NON-TSTM WND GST 1 S UNIONTOWN           46.52N 117.08W
02/21/2023  M56 MPH          WHITMAN            WA   MESONET

            MESONET STATION TUNIN 1.4 S UNIONTOWN (WA
            DOT).

0337 PM     NON-TSTM WND GST 6 ESE PLAIN             47.73N 120.54W
02/20/2023  M58 MPH          CHELAN             WA   MESONET

            MESONET STATION DRYW1 DRY CREEK.

0400 PM     NON-TSTM WND GST 5 SSW EAST WENATCHEE    47.34N 120.33W
02/20/2023  M59 MPH          CHELAN             WA   MESONET

            MESONET STATION DW7538 WINTHROP.

0810 PM     NON-TSTM WND GST 3 SSW PEOLA             46.27N 117.50W
02/20/2023  M60 MPH          GARFIELD           WA   MESONET

            MESONET STATION ADFW1 ALDER.

1200 AM     NON-TSTM WND GST 6 WNW CLARKSTON HEIGHTS 46.42N 117.18W
02/21/2023  M60 MPH          ASOTIN             WA   MESONET

            MESONET STATION SILW 5.6 W CLARKSTON HEIGHTS
            (AGRIMET).

0952 PM     NON-TSTM WND GST 2 ENE PULLMAN           46.75N 117.12W
02/20/2023  M61 MPH          WHITMAN            WA   ASOS

            ASOS STATION KPUW PULLMAN/MOSCOW AIRPORT.

1006 PM     NON-TSTM WND GST 1 SE EPHRATA            47.30N 119.52W
02/20/2023  M62 MPH          GRANT              WA   ASOS

            ASOS STATION KEPH EPHRATA AIRPORT.

0149 AM     NON-TSTM WND GST 12 S WAHA               46.03N 116.90W
02/21/2023  M64 MPH          NEZ PERCE          ID   MESONET

            MESONET STATION CRKI1 CORRAL CREEK.

0335 AM     NON-TSTM WND GST 4 NNW ENTIAT            47.73N 120.24W
02/21/2023  M64 MPH          CHELAN             WA   MESONET

            MESONET STATION TT246 ENTIAT.

0210 AM     NON-TSTM WND GST 3 SSW PEOLA             46.27N 117.50W
02/21/2023  M74 MPH          GARFIELD           WA   MESONET

            MESONET STATION ADFW1 ALDER.

1040 PM     NON-TSTM WND GST 2 SE BEVERLY            46.82N 119.89W
02/20/2023  M76 MPH          GRANT              WA   MESONET

            MESONET STATION AV884 SOUTH OF BEVERLY, IN
            THE SADDLE MOUNTAINS.

&&

Special weather statement, Feb 21, 9:50 AM PST, 4 hours 57 minutes before

Special Weather Statement
National Weather Service Spokane WA
950 AM PST Tue Feb 21 2023

IDZ001-211845-
Northern Panhandle-
950 AM PST Tue Feb 21 2023

...A SNOW SQUALL WILL AFFECT SOUTHEASTERN BOUNDARY AND CENTRAL BONNER
COUNTIES...

At 950 AM PST, a snow squall was located near Bonners Ferry, moving
southwest at 15 mph.

Winds in excess of 30 mph are possible with this squall along with
low visibility less than a half mile.

Locations impacted include...
Bonners Ferry, Naples and Elmira.

This includes U.S. Highway 95 in Idaho between mile markers 486 and
510.

Use extra caution if you must travel into or through this dangerous
snow squall. Rapid changes in visibility and potentially slick roads
are likely to lead to accidents. Consider delaying travel until the
squall passes your location.

Conditions can deteriorate rapidly in winter weather situations. Be
prepared for snow or ice covered roads. Slow down and allow extra
time when traveling.

LAT...LON 4883 11655 4863 11607 4835 11612 4851 11694
TIME...MOT...LOC 1750Z 039DEG 12KT 4868 11641

JW

Special weather statement, Feb 21, 11:58 AM PST, 2 hours 49 minutes before

Special Weather Statement
National Weather Service Spokane WA
1158 AM PST Tue Feb 21 2023

IDZ001-212100-
Northern Panhandle-
1158 AM PST Tue Feb 21 2023

...A SNOW SQUALL WILL AFFECT SOUTHWESTERN BONNER COUNTY...

At 1157 AM PST, a snow squall was located near Coolin and Sandpoint.
Movement was southwest at 10 mph.

Winds in excess of 30 mph are possible with this squall.

Locations impacted include...
Sandpoint, Ponderay, Kootenai, Dover, Schweitzer Mountain, Cocolalla
and Coolin.

This includes the following highways...
 U.S. Highway 95 in Idaho between mile markers 460 and 480.
 U.S. Highway 2 in Idaho between mile markers 14 and 28.

Use extra caution if you must travel into or through this snow
squall. Rapid changes in visibility and potentially slick roads are
expected.

Conditions can deteriorate rapidly in winter weather situations. Be
prepared for snow or ice covered roads. Slow down and allow extra
time when traveling.

LAT...LON 4831 11703 4802 11654 4823 11630 4851 11686
TIME...MOT...LOC 1957Z 026DEG 10KT 4845 11689 4820 11644

JW

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 21, 1:26 PM PST	Snow Squall Warning	OTX	Pend Oreille	49 min
Feb 21, 3:28 PM PST	Snow Squall Warning	OTX	Pend Oreille, Spokane, Stevens	62 min
Feb 21, 9:50 AM PST	Special Weather Statement	OTX	Boundary	55 min
Feb 21, 10:46 AM PST	Snow Squall Warning	OTX	Bonner, Boundary	59 min
Feb 21, 11:58 AM PST	Special Weather Statement	OTX	Bonner	62 min
Feb 21, 12:39 PM PST	Snow Squall Warning	OTX	Bonner, Kootenai	66 min
Feb 21, 1:50 PM PST	Snow Squall Warning	OTX	Bonner, Kootenai	55 min

Nearby

Snow Squall Warnings in Idaho, 2023 Every snow squall warning in 2023

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.