Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 116, NWS Billings, MT

July 19, 2011Carter County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 19, 2011, 8:18 PM MDT for Carter County, Montana. It was in force for 72 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 19, 2011, 8:18 PM MDT (02:18 UTC)
Expired
Jul 19, 2011, 9:30 PM MDT
In force
72 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 02:20 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.3 hours before the alert went out and 327 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, Bismarck Municip, ND at 00:00Z on 2011-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5088 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, Bismarck Municip, ND at 00:00Z on 2011-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
5088 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
1472 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 8:23 PM MDTSpecial Weather StatementBYZYellowstone52 min
Jul 19, 9:06 PM MDTSpecial Weather StatementBYZRosebud54 min
Jul 19, 9:32 PM MDTSpecial Weather StatementBYZTreasure58 min
Jul 19, 10:30 PM MDTSpecial Weather StatementBYZ60 min
Jul 19, 11:20 PM MDTSpecial Weather StatementBYZGolden Valley, Musselshell, Stillwater, Yellowstone55 min
Jul 19, 11:24 PM MDTSpecial Weather StatementBYZCuster, Rosebud51 min
Jul 20, 12:04 AM MDTSpecial Weather StatementBYZRosebud, Treasure, Yellowstone56 min
Jul 20, 1:10 AM MDTSpecial Weather StatementBYZBig Horn, Rosebud65 min
Jul 20, 2:32 AM MDTSpecial Weather StatementBYZSheridan58 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.