Alert archive / Montana / Tornado Warnings in 2002
Tornado Warning 11, NWS Great Falls, MT
NWS Great Falls, MT issued this tornado warning at Aug 6, 2002, 5:11 PM MDT for Fergus County, Montana. It was in force for 64 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 6, 2002, 5:11 PM MDT (23:11 UTC)
- Expired
- Aug 6, 2002, 6:15 PM MDT
- In force
- 64 min
- Issued by
- NWS Great Falls, MT
- Area
- Counties, with a storm outline in the text
County Fergus County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 6, 5:39 PM MDT | Hail 1.75 | Roy, MT | A severe thunderstorm produced 1.75 inch hail for 5 minutes at Roy 10SE. |
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 |
|---|---|---|---|
| Aug 6, 2:40 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.2 hours before the alert went out and 122 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
- 58 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 618 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 406 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
848 WFUS55 KTFX 062311 TORTFX MTC027-070015- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 509 PM MDT TUE AUG 6 2002 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * TORNADO WARNING FOR... CENTRAL FERGUS COUNTY IN CENTRAL MONTANA * UNTIL 615 PM MDT * AT 505 PM MDT...WEATHER SPOTTERS REPORTED A ROTATING WALL CLOUD 12 MILES SOUTHWEST OF ROY...OR ABOUT 19 MILES NORTHEAST OF LEWISTOWN...MOVING NORTHEAST AT 30 MPH. * THE STORM IS EXPECTED TO BE NEAR... 4 MILES SOUTHEAST OF ROY AT 525 PM MDT THIS STORM IS CAPABLE OF PRODUCING A TORNADO...AND VERY LARGE HAIL. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. LAT...LON 4732 10937 4704 10907 4748 10835 4766 10878
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 6:07 PM MDT | Severe Thunderstorm Warning | TFX | Teton | 53 min |
| Aug 5, 6:18 PM MDT | Tornado Warning | TFX | Judith Basin | 27 min |
| Aug 5, 6:45 PM MDT | Tornado Warning | TFX | Chouteau | 30 min |
| Aug 5, 6:48 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 57 min |
| Aug 5, 6:51 PM MDT | Severe Thunderstorm Warning | TFX | Pondera | 54 min |
| Aug 5, 6:59 PM MDT | Tornado Warning | TFX | Chouteau | 46 min |
| Aug 5, 7:03 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 57 min |
| Aug 5, 7:27 PM MDT | Severe Thunderstorm Warning | TFX | Teton | 48 min |
| Aug 5, 7:29 PM MDT | Severe Thunderstorm Warning | TFX | Toole | 46 min |
| Aug 5, 7:32 PM MDT | Tornado Warning | TFX | Fergus | 58 min |
| Aug 5, 7:48 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 57 min |
| Aug 5, 7:58 PM MDT | Severe Thunderstorm Warning | TFX | Liberty | 62 min |
| Aug 5, 8:45 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 30 min |
| Aug 5, 9:18 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 57 min |
| Aug 6, 4:57 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 63 min |
Nearby
Tornado Warnings in Montana, 2002Every tornado warning in 2002Tornadoes in 2002
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.