Alert archive / Montana / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 494
The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2002, 9:30 PM MDT for 8 counties in Montana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2002, 9:30 PM MDT (03:30 UTC)
- Expired
- Jul 5, 2002, 2:00 AM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 9:57 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 63 min |
| Jul 4, 10:06 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 54 min |
| Jul 4, 10:40 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 65 min |
| Jul 4, 10:58 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 62 min |
| Jul 4, 11:43 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 62 min |
| Jul 4, 11:48 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 57 min |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.5 hours before the alert went out and 71 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
- 1143 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 2490 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 6:00 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Broadwater, Daniels, Fergus, Garfield, Golden Valley and 7 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Montana, 2002Every severe thunderstorm watch 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.