Alert archive / Montana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 75, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 7, 1998, 4:10 PM MDT for Cascade County, Teton County, Montana. It was in force for 35 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 7, 1998, 4:10 PM MDT (22:10 UTC)
- Expired
- Aug 7, 1998, 4:45 PM MDT
- In force
- 35 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Cascade County, MT, Teton County, MT
The radar
The Great Falls radar (KTFX), 33 km from the middle of the area, began a volume at 22:10 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 4:30 PM MDT | Hail 1.75 | Vaughn, MT | BROKE WINDOWS AND DESTROYED CROPS |
| Aug 7, 4:45 PM MDT | Hail 1.75 | Dutton, 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, 10.2 hours before the alert went out and 91 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
- 70 J/kg
- Mixed-layer CIN
- -254 J/kg
- Mixed-layer LCL
- 1445 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
414 WUUS1 KGTF 072214 RRA SVRGTF MTC013-099-072245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 410 PM MDT FRI AUG 7 1998 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CASCADE COUNTY IN CENTRAL MONTANA EASTERN TETON COUNTY IN NORTHWESTERN MONTANA * UNTIL 445 PM MDT * AT 409 PM MDT... DOPPLER RADAR AT GREAT FALLS INDICATED A SEVERE THUNDERSTORM 21 MILES SOUTHEAST OF CHOTEAU OR 8 MILES SOUTHWEST OF POWER MOVING NORTHEAST AT 30 MPH. * SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE... POWER AND DUTTON.
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 3:54 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Jefferson, Lewis and Clark | 46 min |
| Aug 7, 4:19 PM MDT | Severe Thunderstorm Warning | TFX | Pondera | 51 min |
| Aug 7, 4:45 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Teton | 45 min |
| Aug 7, 4:51 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 49 min |
| Aug 7, 4:57 PM MDT | Severe Thunderstorm Warning | TFX | Pondera, Toole | 48 min |
| Aug 7, 5:19 PM MDT | Severe Thunderstorm Warning | TFX | Liberty, Toole | 36 min |
| Aug 7, 5:25 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 50 min |
| Aug 7, 5:39 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 51 min |
| Aug 7, 5:39 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 51 min |
| Aug 7, 5:48 PM MDT | Severe Thunderstorm Warning | TFX | Liberty | 42 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.