Alert archive / Montana / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 111, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Aug 6, 2002, 10:38 PM MDT for Valley County, Montana. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 6, 2002, 10:38 PM MDT (04:38 UTC)
- Expired
- Aug 6, 2002, 11:45 PM MDT
- In force
- 67 min
- Issued by
- NWS Glasgow, MT
- Area
- Counties, with a storm outline in the text
County Valley County, MT
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, 8:25 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.6 hours before the alert went out and 17 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
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.
NWS Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 6, 8:30 PM MDT, 2 hours 8 minutes earlier.
Area forecast discussion, Aug 6, 8:30 PM MDT, 2 hours 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, 8:38 PM MDT | Tornado Warning | GGW | McCone | 67 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, 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
Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive.