Alert archive / Montana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 97, NWS Glasgow, MT

July 24, 2013Garfield County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 24, 2013, 7:51 PM MDT for Garfield County, Montana. It was in force for 54 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 24, 2013, 7:51 PM MDT (01:51 UTC)
Expired
Jul 24, 2013, 8:45 PM MDT
In force
54 min
Issued by
NWS Glasgow, MT
Area
Storm-based polygon

County Garfield County, MT

The radar

The Glasgow radar (KGGW), 107 km from the middle of the area, began a volume at 01:50 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 24, 5:26 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 1.9 hours before the alert went out and 272 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, Great_falls, MT at 00:00Z on 2013-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 57 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, Great_falls, MT at 00:00Z on 2013-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
57 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
3725 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 6:06 PM MDTSpecial Weather StatementGGWPhillips54 min
Jul 24, 6:13 PM MDTSevere Thunderstorm WarningGGWDawson62 min
Jul 24, 6:23 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips52 min
Jul 24, 6:26 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Valley64 min
Jul 24, 6:36 PM MDTSevere Thunderstorm WarningGGWPhillips54 min
Jul 24, 6:36 PM MDTSevere Thunderstorm WarningGGWDawson, McCone54 min
Jul 24, 7:02 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips58 min
Jul 24, 7:31 PM MDTSevere Thunderstorm WarningGGWDawson, Garfield, McCone, Prairie59 min
Jul 24, 8:27 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie63 min
Jul 24, 8:44 PM MDTSpecial Weather StatementGGWGarfield61 min

Nearby

Severe Thunderstorm Warnings in Montana, 2013Every severe thunderstorm warning in 2013

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.