Alert archive / Montana / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 28, NWS Missoula, MT

July 11, 1993Lewis and Clark County, Powell County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 11, 1993, 11:41 PM MDT for Lewis and Clark County, Powell County, Montana. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1993, 11:41 PM MDT (05:41 UTC)
Expired
Jul 12, 1993, 12:45 AM MDT
In force
64 min
Issued by
NWS Missoula, MT
Area
Whole counties

Counties Lewis and Clark County, MT, Powell County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 00:00Z, 5.7 hours before the alert went out and 116 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 1993-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 149 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 1993-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.1939587897Sfc1 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
149 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
1844 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
266 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 9:41 PM MDTSevere Thunderstorm WarningMSOLewis and Clark34 min
Jul 12, 12:15 AM MDTSevere Thunderstorm WarningMSOJefferson37 min

Nearby

Severe Thunderstorm Warnings in Montana, 1993Every severe thunderstorm warning in 1993

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.