Alert archive / Montana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 4, NWS Missoula, MT

July 10, 2023Lake County, Missoula County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 10, 2023, 6:02 PM MDT for Lake County, Missoula County, Montana. It was in force for 13 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
Jul 10, 2023, 6:02 PM MDT (00:02 UTC)
Expired
Jul 10, 2023, 6:15 PM MDT
In force
13 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Lake County, MT, Missoula County, MT

The radar

The Missoula radar (KMSX), 33 km from the middle of the area, began a volume at 00:01 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 00:00Z, 0.0 hours before the alert went out and 184 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, Spokane, WA at 00:00Z on 2023-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 510 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, Spokane, WA at 00:00Z on 2023-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
510 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1449 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 6:09 PM MDTSpecial Weather StatementMSORavalli36 min
Jul 10, 6:21 PM MDTSpecial Weather StatementMSOMissoula39 min
Jul 10, 7:00 PM MDTSpecial Weather StatementMSOMissoula30 min
Jul 10, 7:20 PM MDTSpecial Weather StatementMSOMissoula25 min
Jul 10, 7:25 PM MDTSpecial Weather StatementMSOMissoula35 min
Jul 11, 12:58 AM MDTSpecial Weather StatementMSOPowell32 min

Nearby

Severe Thunderstorm Warnings in Montana, 2023Every severe thunderstorm 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.