Alert archive / Montana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 12, NWS Missoula, MT

June 30, 1998Granite County, Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 30, 1998, 11:05 PM MDT for Granite County, Ravalli County, Montana. It was in force for 65 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
Jun 30, 1998, 11:05 PM MDT (05:05 UTC)
Expired
Jul 1, 1998, 12:10 AM MDT
In force
65 min
Issued by
NWS Missoula, MT
Area
Whole counties

Counties Granite County, MT, Ravalli County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 5.1 hours before the alert went out and 256 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 1998-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 372 joules per kilogram.LCLEL10008507005003002001001 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 1998-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.1939Sfc1 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
372 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
2638 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
2 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.

351 
WUUS1 KMSO 010509
SVRMSO
MTC039-081-010610-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1105 PM MDT TUE JUN 30 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME EASTERN RAVALLI COUNTY IN WEST CENTRAL MONTANA
  EXTREME WESTERN GRANITE COUNTY IN WEST CENTRAL MONTANA

* UNTIL 1210 AM MDT

* AT 1105 PM MDT...SEVERE THUNDERSTORM INDICATED 13 MILES
  SOUTHEAST OF STEVENVILLE...BY NATIONAL WEATHER SERVICE DOPPLER
  RADAR...MOVING NORTH AT 15 MPH.

* SEVERE THUNDERSTORM WILL...
  CONTINUE TO MOVE ON THE WEST SIDE OF ROCK CREEK OVER THE SAPPHIRE
  MOUNTAINS.


DESTRUCTIVE HAIL...DAMAGING WINDS...DEADLY LIGHTNING...AND VERY
HEAVY RAIN ARE ALL LIKELY WITH THIS STORM. FOR YOUR PROTECTION...
MOVE INSIDE A STRONG BUILDING...AND STAY AWAY FROM WINDOWS. DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

BELTZ/FOSS

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 30, 8:30 PM MDT, 2 hours 35 minutes earlier.

Area forecast discussion, Jun 30, 8:30 PM MDT, 2 hours 35 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
830 PM MDT TUE JUN 30 1998

WV IMAGERY INDICATING S/WV MOVING THRU SE OR/SW ID ACCOMPANIED BY
WIND MAX TO THE SOUTH. CONVECTION INCREASING OVER SOUTHERN ID AND
MOVING INTO WEST CENTRAL MONTANA. REGION REMAINS UNSTABLE THRU THE
NIGHT WITH THE 12Z ETA MAINTAINING 0 TO -3 LI'S AND RESPECTABLE CAPE
VALUES. THE 18Z ETA PUSHES VORT THRU ID PANHANDLE/NW MT BY EARLY
MORNING. GIVEN INSTABILITY AND DYNAMICS WILL KEEP MENTION OF ISOLATED
SHOWERS AND THUNDERSTORMS IN THE FORECAST THRU THE TONIGHT.
INSTABILITY INCREASES ON WEDNESDAY WITH ANOTHER S/WV MOVING THRU
CENTRAL ID FOR INCREASING THUNDERSTORM ACTIVITY. THIS COVERED WELL
WITH CURRENT FORECAST. ZONES CONTAIN SIGNIFICANT CHANGES. DF

...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE...

LIB .. 054/086 057/082 ... 312244
FCA BE 053/084 056/080 056 312245
POL .. 059/086 054/083 ... 312245
:MSO BB 055/086 055/084 056 312343
HMM .. 056/088 056/086 ... 312332
BTM .. 052/082 050/078 ... 312332
S80 .. 057/084 057/082 ... 312432
P69 .. 059/087 059/085 ... 312532
SMN .. 054/082 055/078 ... 312322

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.