Alert archive / Montana / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 13, NWS Great Falls, MT

June 20, 2024Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 20, 2024, 4:31 PM MDT for Fergus County, Montana. It was in force for 74 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
Jun 20, 2024, 4:31 PM MDT (22:31 UTC)
Expired
Jun 20, 2024, 5:45 PM MDT
In force
74 min
Issued by
NWS Great Falls, MT
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

County Fergus County, MT

The radar

The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 22:34 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

Riverton, WY (KRIW), launched 12:00Z, 10.5 hours before the alert went out and 471 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, Riverton, WY at 12:00Z on 2024-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2024-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2201 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 6:22 PM MDTSpecial Weather StatementTFXLewis and Clark23 min
Jun 19, 6:42 PM MDTSpecial Weather StatementTFXCascade33 min
Jun 19, 7:40 PM MDTSpecial Weather StatementTFX35 min
Jun 19, 7:54 PM MDTSpecial Weather StatementTFXCascade36 min
Jun 19, 8:05 PM MDTSpecial Weather StatementTFXChouteau25 min
Jun 19, 8:28 PM MDTSpecial Weather StatementTFX32 min
Jun 20, 1:12 PM MDTSpecial Weather StatementTFXJudith Basin33 min
Jun 20, 1:47 PM MDTAreal Flood AdvisoryTFXJudith Basin3 hr
Jun 20, 1:52 PM MDTSpecial Weather StatementTFXJudith Basin23 min
Jun 20, 1:56 PM MDTSevere Thunderstorm WarningTFXJudith Basin34 min
Jun 20, 2:26 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin49 min
Jun 20, 3:14 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin46 min
Jun 20, 3:56 PM MDTSpecial Weather StatementTFXFergus34 min
Jun 20, 4:05 PM MDTSpecial Weather StatementTFXPondera25 min
Jun 20, 4:25 PM MDTSpecial Weather StatementTFXFergus35 min
Jun 20, 4:29 PM MDTSpecial Weather StatementTFXBlaine46 min
Jun 20, 4:59 PM MDTSevere Thunderstorm WarningTFXBlaine46 min
Jun 20, 5:38 PM MDTAreal Flood AdvisoryTFXFergus3 hr
Jun 20, 5:41 PM MDTSevere Thunderstorm Warning Considerable damage threatTFXBlaine79 min
Jun 20, 5:45 PM MDTSpecial Weather StatementTFXMusselshell30 min

Nearby

Severe Thunderstorm Warnings in Montana, 2024Every 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.