Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 12, NWS Missoula, MT
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.
- 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
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.