Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 21, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 19, 1997, 4:00 PM MDT for Silver Bow County, Montana. It was in force for 60 min. 1 report 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
- Jul 19, 1997, 4:00 PM MDT (22:00 UTC)
- Expired
- Jul 19, 1997, 5:00 PM MDT
- In force
- 60 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
County Silver Bow County, MT
The radar
The Missoula radar (KMSX), 162 km from the middle of the area, began a volume at 22:03 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 |
|---|---|---|---|
| Jul 19, 4:20 PM MDT | Hail 1 | Butte, 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, 10.0 hours before the alert went out and 234 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
- 122 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSO 192200 RRA SVRMSO MTC093-192300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 400 PM MDT SAT JUL 19 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 500 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWEST MONTANA ...SILVER BOW COUNTY AT 350 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES SOUTH OF BUTTE. THE STORM IS MOVING NORTH AT 20 MPH. THIS WILL PUT THE STORM NEAR BUTTE BETWEEN 430 PM AND 445 PM MDT. THIS STORM HAS A HISTORY OF PRODUCING FUNNEL CLOUDS...GOLF BALL SIZE HAI...AND HEAVY RAIN. SEVERE THUNDERSTORMS PRODUCE DESTRUCTIVE HAIL...DEADLY LIGHTNING.X.. AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. WHITMORE &
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 8:30 AM MDT | Severe Thunderstorm Warning | MSO | Beaverhead, Silver Bow | 60 min |
| Jul 19, 9:34 AM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge | 56 min |
| Jul 19, 12:00 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 45 min |
| Jul 19, 2:19 PM MDT | Flash Flood Warning | MSO | Beaverhead | 56 min |
| Jul 19, 2:19 PM MDT | Severe Thunderstorm Warning | MSO | Beaverhead | 56 min |
| Jul 19, 3:06 PM MDT | Tornado Warning | MSO | Beaverhead | 69 min |
| Jul 19, 5:25 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 50 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1997Every severe thunderstorm warning in 1997
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.