Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 13, NWS Missoula, MT

July 2, 1998Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 2, 1998, 6:10 PM MDT for Ravalli County, Montana. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 2, 1998, 6:10 PM MDT (00:10 UTC)
Expired
Jul 2, 1998, 6:55 PM MDT
In force
45 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Ravalli County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 0.2 hours before the alert went out and 250 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 00:00Z on 1998-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 255 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, Spokane, WA at 00:00Z on 1998-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
255 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
2431 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSO 030016 RRA
SVRMSO
MTC081-030055-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
610 PM MDT THU JUL 2 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN RAVALLI COUNTY IN WEST CENTRAL MONTANA

* UNTIL 655 PM MDT

* AT 605 PM MDT...SEVERE THUNDERSTORM INDICATED 5 MILES EAST OF
  SULA...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...MOVING
  NORTHWEST AT 15 MPH.

* SEVERE THUNDERSTORM WILL BE NEAR...
  ROUTE 93 NEAR SULA INTO THE SULA STATE
  FOREST AT 630 PM MDT.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 3:14 PM MDTSevere Thunderstorm WarningMSOMineral, Missoula46 min
Jul 3, 3:39 PM MDTSevere Thunderstorm WarningMSOMineral, Missoula61 min
Jul 3, 4:19 PM MDTSevere Thunderstorm WarningMSOLake, Missoula, Sanders61 min
Jul 3, 4:34 PM MDTFlash Flood WarningMSOLake, Missoula, Sanders86 min
Jul 3, 5:20 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula, Powell45 min

Nearby

Severe Thunderstorm Warnings in Montana, 1998Every severe thunderstorm warning in 1998

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.