Alert archive / Montana / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 774
The Storm Prediction Center issued this severe thunderstorm watch at Aug 22, 2004, 1:40 PM MDT for 23 counties in Montana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2004, 1:40 PM MDT (19:40 UTC)
- Expired
- Aug 22, 2004, 7:00 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 23 counties
Beaverhead County, MT, Blaine County, MT, Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Gallatin County, MT, Golden Valley County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Liberty County, MT, Madison County, MT, Meagher County, MT, Park County, MT, Pondera County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Toole County, MT, Wheatland County, MT
The radar
The Great Falls radar (KTFX), 94 km from the middle of the area, began a volume at 19:44 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 3:38 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 52 min |
| Aug 22, 4:29 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 46 min |
| Aug 22, 5:47 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 28 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, 7.7 hours before the alert went out and 98 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
- 68 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 1450 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 108 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 22, 1:20 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Carbon, Cascade, Deer Lodge, Gallatin and 15 more | 85 min |
| Aug 22, 5:57 PM MDT | Mesoscale Discussion | SPC | Blaine, Broadwater, Carbon, Cascade, Chouteau, Fergus and 20 more | 93 min |
Nearby
Severe Thunderstorm Watches in Montana, 2004Every severe thunderstorm watch in 2004
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.