Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 148, NWS Billings, MT

August 7, 2011Carter County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Aug 7, 2011, 3:28 PM MDT for Carter County, Montana. It was in force for 62 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
Aug 7, 2011, 3:28 PM MDT (21:28 UTC)
Expired
Aug 7, 2011, 4:30 PM MDT
In force
62 min
Issued by
NWS Billings, MT
Area
Storm-based polygon

County Carter County, MT

The radar

The Rapid City radar (KUDX), 205 km from the middle of the area, began a volume at 21:30 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

Rapid City, SD (KUNR), launched 12:00Z, 9.5 hours before the alert went out and 207 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, Rapid City, SD at 12:00Z on 2011-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 561 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, Rapid City, SD at 12:00Z on 2011-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
561 J/kg
Mixed-layer CIN
-335 J/kg
Mixed-layer LCL
1423 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 6:00 PM MDTSpecial Weather StatementBYZ60 min
Aug 6, 7:01 PM MDTSpecial Weather StatementBYZBig Horn59 min
Aug 6, 7:39 PM MDTSpecial Weather StatementBYZCarbon66 min
Aug 6, 10:29 PM MDTSpecial Weather StatementBYZTreasure61 min
Aug 7, 2:58 PM MDTSpecial Weather StatementBYZCarter47 min
Aug 7, 4:38 PM MDTSpecial Weather StatementBYZYellowstone37 min
Aug 7, 4:49 PM MDTSpecial Weather StatementBYZBig Horn56 min
Aug 7, 4:56 PM MDTSpecial Weather StatementBYZYellowstone64 min
Aug 7, 5:54 PM MDTSpecial Weather StatementBYZBig Horn66 min
Aug 6, 10:24 PM MDTSpecial Weather StatementBYZSheridan66 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011Every severe thunderstorm warning in 2011

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.