Alert archive / Montana / Tornado Warnings in 2002
Tornado Warning 10, NWS Glasgow, MT
NWS Glasgow, MT issued this tornado warning at Aug 6, 2002, 8:38 PM MDT for McCone County, Montana. It was in force for 67 min. 3 reports 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, 8:38 PM MDT (02:38 UTC)
- Expired
- Aug 6, 2002, 9:45 PM MDT
- In force
- 67 min
- Issued by
- NWS Glasgow, MT
- Area
- Counties, with a storm outline in the text
County McCone County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 6, 8:58 PM MDT | Thunderstorm Wind 70 M | Circle, MT | 80 mph wind reported by spotter 8 miles north of Circle. |
| Aug 6, 9:15 PM MDT | Thunderstorm Wind 52 M | Vida, MT | 60 mph wind reported by spotter 10 miles south of Vida. |
| Aug 6, 9:20 PM MDT | Thunderstorm Wind 75 M | Vida, MT | 86 mph wind reported by spotter 10 miles southwest of Vida. |
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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
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 |
| Aug 6, 8:25 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.6 hours before the alert went out and 90 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
- 2005 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1499 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
345
WFUS55 KGGW 070238
TORGGW
MTC055-070345-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
838 PM MDT TUE AUG 6 2002
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
* TORNADO WARNING FOR...
MCCONE COUNTY IN NORTHEAST MONTANA
* UNTIL 945 PM MDT
* AT 835 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
TORNADO 4 MILES SOUTHEAST OF BROCKWAY...OR ABOUT 12 MILES SOUTHWEST
OF CIRCLE...MOVING NORTH AT 35 MPH.
* THE TORNADO IS EXPECTED TO BE NEAR...
CIRCLE AT 850 PM MDT
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
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 4727 10617 4723 10583 4723 10544 4802 10539
4799 10587 4797 10626
.END
77What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Glasgow, MT wrote its last area forecast discussion before this tornado warning went out at Aug 6, 8:30 PM MDT, 8 minutes earlier.
Area forecast discussion, Aug 6, 8:30 PM MDT, 8 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
830 PM MDT TUE AUG 6 2002
.SHORT TERM...KGGW SOUNDING SHOWING 18Z CAP QUICKLY ERODED ALLLOWING
FOR SEVERE STORM DEVELOPMENT...BUT RATHER ISOLATED. UPDATING ZONES
FOR NEW SEVERE THUNDERSTORM WATCH WHICH REPLACES TORNADO WATCH. WILL
CHANGE SOME WORDING AND UPDATE SURFACE WINDS. SIMONSEN
.LONG TERM...
12Z AVN A BIT SLOWER WITH EXITING UPPER LOW LATER THIS WEEK. ITS
TIMING MORE IN LINE WITH ECMWF SOLUTION. UPPER TROF THEN FOLLOWS
THIS SYSTEM FROM THE NW TO BRING ANOTHER COOL AIRMASS. JAMBA
KGGW TTB 062/084 059/078 059/078 76466663
BTBB 054/084 053/084 053/080 053/078 7600032011
KGDV TTB 063/086 060/079 060/080 76466663
BTBE 054/085 055/084 055/081 055/079 7600132022
.GGW...TORNADO WATCH CANCELLED. SEVERE THUNDERSTORM WATCH UNTIL 2
AM...ALL COUNTIES EXCEPT PHILLIPS AND PETROLEUM.The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 6:44 PM MDT | Tornado Warning | GGW | Petroleum, Phillips | 61 min |
| Aug 6, 8:03 PM MDT | Tornado Warning | GGW | Prairie | 57 min |
| Aug 6, 8:09 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 66 min |
| Aug 6, 9:46 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 59 min |
| Aug 6, 10:00 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 60 min |
| Aug 6, 10:04 PM MDT | Severe Thunderstorm Warning | GGW | McCone, Richland, Roosevelt | 41 min |
| Aug 6, 10:38 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 67 min |
| Aug 6, 11:44 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 61 min |
| Aug 6, 11:51 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 54 min |
| Aug 6, 11:54 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 66 min |
| Aug 7, 12:49 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 56 min |
| Aug 7, 12:53 AM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 67 min |
| Aug 7, 1:42 AM MDT | Flash Flood Warning | GGW | Phillips | 6 hr |
| Aug 7, 1:55 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 50 min |
| Aug 7, 2:21 AM MDT | Flash Flood Warning | GGW | Roosevelt | 6 hr |
| Aug 7, 2:47 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 58 min |
| Aug 7, 3:17 AM MDT | Severe Thunderstorm Warning | GGW | Daniels, Sheridan | 58 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.