Alert archive / Montana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 3, NWS Missoula, MT

July 2, 1990Meagher County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 2, 1990, 4:01 PM MDT for Meagher County, Montana. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
Jul 2, 1990, 4:01 PM MDT (22:01 UTC)
Expired
Jul 2, 1990, 5:00 PM MDT
In force
59 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Meagher 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 (KTFX), launched 12:00Z, 10.0 hours before the alert went out and 98 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 1990-07-02Temperature 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, Great_falls, MT at 12:00Z on 1990-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3634 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
73 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 KHLN 022201 RRA
SVRHLN
MTC059-022300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HELENA MT
401 PM MDT MON JUL 2 1990
 
THE NATIONAL WEATHER SERVICE IN HELENA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  500 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MONTANA
 
   ...MEAGHER COUNTY
 
A SEVERE THUNDERSTOR PASSED THROUGH HELENA AT 345 PM THIS MONDAY
AFTERNOON. IT SHOULD BE REACHING MEAGHER COUNTY WITHIN THE NEXT 30
MINUTES. THIS STORM HAS PRODUCED WINDS TO 65 MPH AND 1/2 INCH HAIL.
ALL PERSONS IN THE PATH OF THIS STORM SHOULD TAKE COVER. THIS IS A
DANGEROUS STORM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 3:49 PM MDTSevere Thunderstorm WarningMSOBroadwater, Lewis and Clark56 min
Jul 2, 4:39 PM MDTSevere Thunderstorm WarningMSOBroadwater, Lewis and Clark, Meagher66 min

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.