Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 16, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 6, 1997, 2:55 PM MDT for Lewis and Clark County, Montana. It was in force for 50 min. 3 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
- Jun 6, 1997, 2:55 PM MDT (20:55 UTC)
- Expired
- Jun 6, 1997, 3:45 PM MDT
- In force
- 50 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Lewis and Clark County, MT
The radar
The Great Falls radar (KTFX), 85 km from the middle of the area, began a volume at 20:56 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 |
|---|---|---|---|
| Jun 6, 3:23 PM MDT | Hail 1 | Helena, MT | |
| Jun 6, 3:30 PM MDT | Hail 1.25 | Helena Arpt, MT | |
| Jun 6, 3:35 PM MDT | Hail 3 | Helena, 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, 8.9 hours before the alert went out and 140 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 986 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 168 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 KGTF 062055 SVRGTF MTC049-062145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 255 PM MDT FRI JUN 6 1997 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 345 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWEST MONTANA ...SOUTHERN LEWIS AND CLARK COUNTY AT 255 PM...GREAT FALLS RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES SOUTH|WEST OF HELENA. THIS STORM WAS MOVING TOWARDS THE NORTHEAST AT 35 MPH AND WILL MOVE INTO HELENA BY 330 PM. LARGE DAMAGING HAIL AND HEAVY RAIN ARE LIKELY WITH THIS STORM.
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 6:34 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater | 41 min |
| Jun 6, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 45 min |
| Jun 6, 4:03 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 57 min |
| Jun 6, 4:19 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Judith Basin | 56 min |
| Jun 6, 4:38 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 67 min |
| Jun 6, 5:15 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Fergus | 60 min |
| Jun 6, 5:31 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin, Meagher | 59 min |
| Jun 6, 5:52 PM MDT | Severe Thunderstorm Warning | TFX | Yellowstone | 68 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.