Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 22, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 3, 1998, 8:32 PM MDT for Powell County, Montana. It was in force for 33 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 3, 1998, 8:32 PM MDT (02:32 UTC)
- Expired
- Jul 3, 1998, 9:05 PM MDT
- In force
- 33 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Powell County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 2.5 hours before the alert went out and 189 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
- 1560 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1121 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 310 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 8.8
The text
As transmitted, in the capitals the NWS used until 2016.
495 WUUS1 KMSO 040235 RRA SVRMSO MTC077-040305- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 832 PM MDT FRI JUL 3 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN POWELL COUNTY IN WEST CENTRAL MONTANA * UNTIL 905 PM MDT * AT 832 PM MDT...SEVERE THUNDERSTORM INDICATED 20 MILES SOUTHWEST OF MCDONALD PASS...BY NATIONAL WEATHER SERVICE DOPPLER RADAR... MOVING NORTHEAST AT 25 MPH. * SEVERE THUNDERSTORM WILL BE NEAR... MC DONALD PASS AT 845 PM MDT
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 Jul 3, 8:30 PM MDT, 2 minutes earlier.
Area forecast discussion, Jul 3, 8:30 PM MDT, 2 minutes before
WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 830 PM MDT FRI JUL 3 1998 UPPER LOW SPINNING IN SOUTHWEST WASHINGTON SENDING ANOTHER SHORT WAVE ACROSS EASTERN OREGON WESTERN IDAHO HELPING SCATTERED THUNDERSTORMS THERE. ELSEWHERE WOULD LIKE TO BACK OFF TO SCATTERED POPS. TC ...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE... LIB .. 060/078 056/076 ... 295535 FCA WE 058/078 054/075 052 294545 POL .. 060/072 056/068 ... 293545 MSO WE 057/079 054/075 053 294545 HMM .. 056/083 055/080 ... 294545 BTM .. 049/079 049/075 ... 293334 S80 .. 058/078 056/075 ... 295335 P69 .. 060/080 058/076 ... 295445 SMN .. 054/075 052/072 ... 295333
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 6:12 PM MDT | Flash Flood Warning | MSO | Missoula, Powell | 53 min |
| Jul 3, 6:21 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell | 49 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.