Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 9, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at May 31, 1997, 5:55 PM MDT for Lake County, Missoula County, Montana. It was in force for 65 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
- May 31, 1997, 5:55 PM MDT (23:55 UTC)
- Expired
- May 31, 1997, 7:00 PM MDT
- In force
- 65 min
- Issued by
- NWS Missoula, MT
- Area
- Whole counties
Counties Lake County, MT, Missoula County, MT
The radar
The Missoula radar (KMSX), 33 km from the middle of the area, began a volume at 23:54 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 |
|---|---|---|---|
| May 31, 6:30 PM MDT | Thunderstorm Wind 63 | Huson, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 31, 4:15 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 11.9 hours before the alert went out and 184 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
- 11 J/kg
- Mixed-layer CIN
- -225 J/kg
- Mixed-layer LCL
- 1213 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 146 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 010000 RRA SVRMSO MTC047-063-010100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 555 PM MDT SAT MAY 31 1997 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN WEST CENTRAL MONTANA ...SOUTHERN LAKE COUNTY...MISSOULA COUNTY AT 555 PM MDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS EXTENDING FROM SOUTHERN LAKE COUNTY THROUGH WESTERN MISSOULA COUNTY. THE LINE IS MOVING EAST AT 30 MPH...AND WILL PUSH THROUGH POLSON...ARLEE...AND MISSOULA BY 615 PM MDT. THESE STORMS MAY PRODUCE LARGE HAIL...HEAVY RAIN...AND WIND GUSTS TO 60 MPH. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATE.R CROSSINGS. WHITMORE/FOSS
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 4:25 PM MDT | Severe Thunderstorm Warning | MSO | Beaverhead | 45 min |
| May 31, 4:30 PM MDT | Severe Thunderstorm Warning | MSO | Beaverhead | 45 min |
| May 31, 4:34 PM MDT | Severe Thunderstorm Warning | MSO | Lincoln, Sanders | 41 min |
| May 31, 4:49 PM MDT | Severe Thunderstorm Warning | MSO | Mineral | 41 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.