Alert archive / Montana / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 17, NWS Missoula, MT

June 21, 1993Flathead County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 21, 1993, 5:43 PM MDT for Flathead County, Montana. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1993, 5:43 PM MDT (23:43 UTC)
Expired
Jun 21, 1993, 6:30 PM MDT
In force
47 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Flathead County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 12:00Z, 11.7 hours before the alert went out and 224 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 12:00Z on 1993-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 205 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 12:00Z on 1993-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.1939Sfc1 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
205 J/kg
Mixed-layer CIN
-260 J/kg
Mixed-layer LCL
2366 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
98 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jun 20, 8:24 PM MDTSevere Thunderstorm WarningMSOMissoula66 min
Jun 21, 12:41 AM MDTSevere Thunderstorm WarningMSOSanders64 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.