Alert archive / Montana / Special Weather Statements in 2023

Special Weather Statement, NWS Missoula, MT

September 8, 2023Missoula County, Montana

NWS Missoula, MT issued this special weather statement at Sep 8, 2023, 2:21 AM MDT for Missoula County, Montana. It was in force for 24 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 8, 2023, 2:21 AM MDT (08:21 UTC)
Expired
Sep 8, 2023, 2:45 AM MDT
In force
24 min
Issued by
NWS Missoula, MT
Hail
0.75 in
Wind
30

County Missoula County, MT

The radar

The Missoula radar (KMSX), 47 km from the middle of the area, began a volume at 08:23 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

Boise Airport, ID (KBOI), launched 00:00Z, 8.4 hours before the alert went out and 380 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-pSkew-T log-p diagram, Boise Airport, ID at 00:00Z on 2023-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 419 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 00:00Z on 2023-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
419 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
2655 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 8, 2:46 AM MDTSpecial Weather StatementMSOMissoula29 min
Sep 8, 3:16 AM MDTSpecial Weather StatementMSOMissoula29 min
Sep 8, 3:43 AM MDTSpecial Weather StatementMSOPowell32 min
Sep 8, 5:31 PM MDTSpecial Weather StatementMSOPowell29 min

Nearby

Special Weather Statements in Montana, 2023Every special weather statement 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.