Alert archive / Montana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 2, NWS Glasgow, MT

July 29, 1987Garfield County, McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 29, 1987, 6:51 PM MDT for Garfield County, McCone County, Montana. It was in force for 54 min.

The area

The counties it named.

The facts

Issued
Jul 29, 1987, 6:51 PM MDT (00:51 UTC)
Expired
Jul 29, 1987, 7:45 PM MDT
In force
54 min
Issued by
NWS Glasgow, MT
Area
Whole counties

Counties Garfield County, MT, McCone County, MT

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Great Falls, MT (KGTF), launched 00:00Z, 0.9 hours before the alert went out and 369 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 1987-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 195 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 1987-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
195 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
1615 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 Glasgow, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 7:40 PM MDTSevere Thunderstorm WarningGGWValley110 min

Nearby

Severe Thunderstorm Warnings in Montana, 1987Every severe thunderstorm warning in 1987

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.