Alert archive / Montana / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 850
The Storm Prediction Center issued this severe thunderstorm watch at Aug 7, 2003, 3:45 PM MDT for 20 counties in Montana. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2003, 3:45 PM MDT (21:45 UTC)
- Expired
- Aug 7, 2003, 10:00 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Blaine County, MT, Chouteau County, MT, Daniels County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, Hill County, MT, Judith Basin County, MT, McCone County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wheatland County, MT, Wibaux County, MT
The radar
The Glasgow radar (KGGW), 124 km from the middle of the area, began a volume at 21:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 3:52 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 38 min |
| Aug 7, 4:35 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 55 min |
| Aug 7, 5:31 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 59 min |
| Aug 7, 5:43 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 62 min |
| Aug 7, 5:48 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 57 min |
| Aug 7, 6:47 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 58 min |
| Aug 7, 7:06 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 54 min |
| Aug 7, 7:25 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 65 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 9.8 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2439 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -81 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 7:25 PM MDT | Mesoscale Discussion | SPC | Blaine, Fergus, Garfield, Golden Valley, Musselshell, Petroleum and 2 more | 2 hr |
| Aug 7, 12:16 AM MDT | Mesoscale Discussion | SPC | McCone, Richland | 59 min |
| Aug 7, 2:18 PM MDT | Mesoscale Discussion | SPC | Broadwater, Cascade, Chouteau, Deer Lodge, Gallatin, Granite and 12 more | 117 min |
| Aug 7, 5:56 PM MDT | Mesoscale Discussion | SPC | Blaine, Chouteau, Daniels, Dawson, Fergus, Garfield and 14 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Montana, 2003Every severe thunderstorm watch in 2003
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; radar from the NEXRAD Level II archive.