Alert archive / Montana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 1, NWS Missoula, MT

May 23, 1990Mineral County, Sanders County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at May 23, 1990, 4:44 PM MDT for Mineral County, Sanders County, Montana. It was in force for 61 min.

The area

The counties it named.

The facts

Issued
May 23, 1990, 4:44 PM MDT (22:44 UTC)
Expired
May 23, 1990, 5:45 PM MDT
In force
61 min
Issued by
NWS Missoula, MT
Area
Whole counties

Counties Mineral County, MT, Sanders 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

Spokane, WA (KOTX), launched 12:00Z, 10.7 hours before the alert went out and 105 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, Spokane, WA at 12:00Z on 1990-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Spokane, WA at 12:00Z on 1990-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3585 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMSO 232244
SVRMSO
MTC061-089-232345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE MISSOULA MT
444 PM MDT WED MAY 23 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 545 PM MDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE WEST CENTRAL PART OF MONTANA
      NORTHERN MINERAL...SANDERS

MISSOULA WEATHER RADAR SHOWES SEVERE THUNDERSTORM IN NORTHERN ID.
THESE ST+ORMS ARE MOVING NORTHEAST AT 25MPH. THEY ARE EXPECTED TO BE
 IN THE ST. REGIS AREA IN THE NEXT HOUR.

THIS STORM IS ACCOMPANIED BY INTENSE LIGHTNING AND STRONG GUSTY
WIND. LIGHTNING IS A MAJOR CAUSE OF THUNDERSTORM FATALITIES.

Nearby

Severe Thunderstorm Warnings in Montana, 1990Every severe thunderstorm warning in 1990

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.