Alert archive / Montana / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 85, NWS Billings, MT

August 17, 2006Stillwater County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Aug 17, 2006, 4:59 PM MDT for Stillwater County, Montana. It was in force for 61 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 17, 2006, 4:59 PM MDT (22:59 UTC)
Expired
Aug 17, 2006, 6:00 PM MDT
In force
61 min
Issued by
NWS Billings, MT
Area
Counties, with a storm outline in the text

County Stillwater County, MT

The radar

The Billings radar (KBLX), 65 km from the middle of the area, began a volume at 23:01 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

Riverton, WY (KRIW), launched 12:00Z, 11.0 hours before the alert went out and 300 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 2006-08-17Temperature 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 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 2006-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
-256 J/kg
Mixed-layer LCL
2567 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
111 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 16, 11:08 PM MDTSevere Thunderstorm WarningBYZWheatland37 min
Aug 16, 11:45 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Wheatland33 min
Aug 17, 12:05 AM MDTSevere Thunderstorm WarningBYZMusselshell55 min
Aug 17, 2:30 PM MDTSevere Thunderstorm WarningBYZPark43 min
Aug 17, 3:10 PM MDTSevere Thunderstorm WarningBYZSweet Grass65 min
Aug 17, 3:50 PM MDTSevere Thunderstorm WarningBYZWheatland41 min
Aug 17, 5:45 PM MDTSevere Thunderstorm WarningBYZYellowstone60 min

Nearby

Severe Thunderstorm Warnings in Montana, 2006Every severe thunderstorm warning in 2006

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.