Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 32, NWS Missoula, MT

August 21, 2002Deer Lodge County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Aug 21, 2002, 2:57 PM MDT for Deer Lodge County, Montana. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 21, 2002, 2:57 PM MDT (20:57 UTC)
Expired
Aug 21, 2002, 3:30 PM MDT
In force
33 min
Issued by
NWS Missoula, MT
Area
Counties, with a storm outline in the text

County Deer Lodge County, MT

What was reported inside it

TimeReportWhereRemark
Aug 21, 3:30 PM MDTHail 0.75Deer Lodge, MT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.0 hours before the alert went out and 220 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 2002-08-21Temperature 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 2002-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 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
850 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
83 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 
WUUS55 KMSO 212057
SVRMSO
MTC023-212130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
256 PM MDT WED AUG 21 2002

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DEER LODGE COUNTY IN WEST CENTRAL MONTANA   

* UNTIL 330 PM MDT

* AT 256 PM MDT...SPOTTERS REPORTED A SEVERE THUNDERSTORM OVER
  ANACONDA...OR 3 MILES NORTH OF ANACONDA...MOVING NORTH AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  6 MILES WEST OF GALEN AT 315 PM MDT
  8 MILES SOUTHWEST OF DEER LODGE AT 330 PM MDT

LARGE HAIL UP TO ONE INCH IS LIKELY WITH THIS SEVERE THUNDERSTORM. 
DAMAGING WINDS IN EXCESS OF 55 MPH ARE POSSIBLE...ALONG WITH 
FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO INDOORS 
AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A 
WELL PROTECTED AREA.


LAT...LON 4615 11309 4609 11285 4644 11261 4653 11295

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 4:12 PM MDTSevere Thunderstorm WarningMSORavalli48 min

Nearby

Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.