Alert archive / Montana / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 29, NWS Great Falls, MT

July 5, 2026Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 5, 2026, 7:05 PM MDT for Fergus County, Montana. It was in force for 70 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 5, 2026, 7:05 PM MDT (01:05 UTC)
Expired
Jul 5, 2026, 8:15 PM MDT
In force
70 min
Issued by
NWS Great Falls, MT
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

County Fergus County, MT

The radar

The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 01:07 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.1 hours before the alert went out and 223 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, Glasgow Intl Airport, MT at 00:00Z on 2026-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 255 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, Glasgow Intl Airport, MT at 00:00Z on 2026-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 square meters per square second.19395878Sfc1 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
255 J/kg
Mixed-layer CIN
-208 J/kg
Mixed-layer LCL
2787 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 6:25 PM MDTSevere Thunderstorm WarningTFXJudith Basin58 min
Jul 5, 7:09 PM MDTSpecial Weather StatementTFXBeaverhead66 min
Jul 5, 7:28 PM MDTSpecial Weather StatementTFXFergus47 min
Jul 5, 7:49 PM MDTSevere Thunderstorm WarningTFXBlaine, Fergus71 min
Jul 5, 7:52 PM MDTSevere Thunderstorm WarningTFXFergus68 min
Jul 5, 8:01 PM MDTSpecial Weather StatementTFXBeaverhead59 min
Jul 5, 8:21 PM MDTSpecial Weather StatementTFXLiberty, Toole54 min
Jul 5, 8:53 PM MDTSpecial Weather StatementTFXBlaine52 min
Jul 5, 10:08 PM MDTSevere Thunderstorm WarningTFXBlaine56 min
Jul 6, 5:12 PM MDTSpecial Weather StatementTFXMadison48 min

Nearby

Severe Thunderstorm Warnings in Montana, 2026Every severe thunderstorm warning in 2026

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.