Alert archive / Montana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 80, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Sep 15, 1997, 1:42 PM MDT for Cascade County, Chouteau County, Judith Basin County, Montana. It was in force for 63 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
- Sep 15, 1997, 1:42 PM MDT (19:42 UTC)
- Expired
- Sep 15, 1997, 2:45 PM MDT
- In force
- 63 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Cascade County, MT, Chouteau County, MT, Judith Basin County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 15, 2:30 PM MDT | Hail 0.75 | Eden, 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, 7.7 hours before the alert went out and 8 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
- 54 J/kg
- Mixed-layer CIN
- -492 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 181 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 151945 SVRGTF MTC045-013-015-152045- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 142 PM MDT MON SEP 15 1997 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 245 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN CENTRAL MONTANA ...NORTHWESTERN JUDITH BASIN COUNTY IN NORTH MONTANA ...EAST CENTRAL CASCADE COUNTY IN NORTH CENTRAL MONTANA ...SOUTHWESTERN CHOUTEAU COUNTY DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN EASTERN CASCADE COUNTY. THIS STORM WAS MOVING TOWARD THE NORTHEAST AT 45 TO 50 MPH AND WILL MOVE ACROSS NORTHWEST JUDITH BASIN COUNTY AND INT&O SOUTHWEST CHOUTEAU COUNTY BY 230 PM THIS AFTERNOON. REPORTS OF 3/4 INCH HAIL HAVE BEEN REPORTED WITH THIS STORM ALONG WITH WIND GUSTS IN EXCESS OF 60 MPH. BRIEF HEAVY RAIN HAS ALSO BEEN REPORTED. &
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.
In the hours before
Special weather statement, Sep 15, 1:26 PM MDT, 16 minutes before
MTZ014-151930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 120 PM MDT MON SEP 15 1997 ...SEVERE THUNDERSTORM WARNING FOR SOUTHERN LEWIS AND CLARK COUNTY HAS BEEN ALLOWED TO EXPIRE... ...SEVERE THUNDERSTORM WARNING CONTINUES FOR NORTHERN CASCADE COUNTY UNTIL 145 PM MDT... THE SEVERE THUNDERSTORM THAT DEVELOPED OVER SOUTHERN LEWIS AND CLARK HAS DIMINISHED IN INTENSITY AND HAS MOVED EAST INTO NORTHERN BROADWATER COUNTY. REPORTS OF WIND GUSTS TO 60 MPH AND HAIL THREE-QUARTER INCH IN DIAMETER WERE REPORTED IN THE HELENA AREA. A SEVERE THUNDERSTORM OVER NORTHERN CASCADE COUNTY CONTINUES TO MOVE NORTHEAST AT 40 MPH. STRONG GUSTY WINDS IN EXCESS OF 55 MPH...HEAVY RAIN AND HAIL HAVE BEEN REPORTED WITH THIS STORM. & &
Special weather statement, Sep 15, 1:27 PM MDT, 15 minutes before
MTZ014-151930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 120 PM MDT MON SEP 15 1997 ...SEVERE THUNDERSTORM WARNING FOR SOUTHERN LEWIS AND CLARK COUNTY HAS BEEN ALLOWED TO EXPIRE... ...SEVERE THUNDERSTORM WARNING CONTINUES FOR NORTHERN CASCADE COUNTY UNTIL 145 PM MDT... THE SEVERE THUNDERSTORM THAT DEVELOPED OVER SOUTHERN LEWIS AND CLARK HAS DIMINISHED IN INTENSITY AND HAS MOVED EAST INTO NORTHERN BROADWATER COUNTY. REPORTS OF WIND GUSTS TO 60 MPH AND HAIL THREE-QUARTER INCH IN DIAMETER WERE REPORTED IN THE HELENA AREA. A SEVERE THUNDERSTORM OVER NORTHERN CASCADE COUNTY CONTINUES TO MOVE NORTHEAST AT 40 MPH. STRONG GUSTY WINDS IN EXCESS OF 55 MPH...HEAVY RAIN AND HAIL HAVE BEEN REPORTED WITH THIS STORM. & &
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 11:46 AM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 44 min |
| Sep 15, 12:27 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 48 min |
| Sep 15, 12:36 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 54 min |
| Sep 15, 1:04 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 41 min |
| Sep 15, 2:42 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Chouteau, Hill | 63 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.