Alert archive / Montana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 60, NWS Great Falls, MT

July 1, 2019Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 1, 2019, 5:46 PM MDT for Fergus County, Montana. It was in force for 22 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 1, 2019, 5:46 PM MDT (23:46 UTC)
Expired
Jul 1, 2019, 6:08 PM MDT
In force
22 min
Issued by
NWS Great Falls, MT
Area
Storm-based polygon
Hail
1.0 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 23:48 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 1, 1:33 PM MDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 11.8 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 2019-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 joules per kilogram.LCLLFCEL10008507005003002001001 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 2019-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
22 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
1225 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
98 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 30, 7:33 PM MDTSpecial Weather StatementTFXMeagher42 min
Jul 1, 12:27 PM MDTSpecial Weather StatementTFXPondera48 min
Jul 1, 12:29 PM MDTSpecial Weather StatementTFXTeton31 min
Jul 1, 1:02 PM MDTSpecial Weather StatementTFXTeton28 min
Jul 1, 1:04 PM MDTSpecial Weather StatementTFXJudith Basin26 min
Jul 1, 1:22 PM MDTSevere Thunderstorm WarningTFXChouteau, Liberty, Pondera, Toole53 min
Jul 1, 1:33 PM MDTSpecial Weather StatementTFXJudith Basin27 min
Jul 1, 2:08 PM MDTSpecial Weather StatementTFXJudith Basin22 min
Jul 1, 2:11 PM MDTSpecial Weather StatementTFXChouteau19 min
Jul 1, 2:13 PM MDTSpecial Weather StatementTFXCascade32 min
Jul 1, 2:34 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin26 min
Jul 1, 2:39 PM MDTSpecial Weather StatementTFXChouteau36 min
Jul 1, 2:52 PM MDTSpecial Weather StatementTFXChouteau23 min
Jul 1, 3:01 PM MDTSpecial Weather StatementTFXFergus29 min
Jul 1, 3:02 PM MDTSpecial Weather StatementTFXFergus28 min
Jul 1, 3:08 PM MDTSpecial Weather StatementTFXLiberty37 min
Jul 1, 3:16 PM MDTSpecial Weather StatementTFXChouteau29 min
Jul 1, 3:17 PM MDTSpecial Weather StatementTFXChouteau28 min
Jul 1, 3:22 PM MDTSpecial Weather StatementTFXBlaine23 min
Jul 1, 3:33 PM MDTSpecial Weather StatementTFXFergus27 min
Jul 1, 3:35 PM MDTSpecial Weather StatementTFXFergus25 min
Jul 1, 3:45 PM MDTSevere Thunderstorm WarningTFXFergus45 min
Jul 1, 3:45 PM MDTSevere Thunderstorm WarningTFXBlaine, Chouteau, Hill60 min
Jul 1, 3:51 PM MDTSpecial Weather StatementTFXJudith Basin24 min
Jul 1, 4:02 PM MDTSpecial Weather StatementTFXMadison58 min
Jul 1, 4:32 PM MDTSpecial Weather StatementTFXPetroleum28 min
Jul 1, 4:49 PM MDTSpecial Weather StatementTFXBlaine41 min
Jul 1, 5:34 PM MDTSpecial Weather StatementTFXFergus26 min

Nearby

Severe Thunderstorm Warnings in Montana, 2019Every severe thunderstorm warning in 2019

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.