Alert archive / Montana / Tornado Watches in 1997
Tornado Watch 620
The Storm Prediction Center issued this tornado watch at Jul 17, 1997, 4:00 PM MDT for 19 counties in Montana. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 1997, 4:00 PM MDT (22:00 UTC)
- Expired
- Jul 18, 1997, 12:00 AM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Treasure County, MT, Valley County, MT, Wibaux County, MT
The radar
The Glasgow radar (KGGW), 118 km from the middle of the area, began a volume at 22:03 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
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:19 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 56 min |
| Jul 17, 5:44 PM MDT | Tornado Warning | GGW | Phillips | 46 min |
| Jul 17, 6:20 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 55 min |
| Jul 17, 6:32 PM MDT | Tornado Warning | GGW | Valley | 58 min |
| Jul 17, 7:04 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 56 min |
| Jul 17, 7:17 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 58 min |
| Jul 17, 8:11 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 64 min |
| Jul 17, 8:17 PM MDT | Severe Thunderstorm Warning | GGW | Garfield, McCone | 58 min |
| Jul 17, 8:33 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 57 min |
| Jul 17, 8:37 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 63 min |
| Jul 17, 8:55 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 65 min |
| Jul 17, 9:05 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 55 min |
| Jul 17, 9:26 PM MDT | Severe Thunderstorm Warning | GGW | Daniels | 64 min |
| Jul 17, 9:39 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 66 min |
| Jul 17, 9:42 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 48 min |
| Jul 17, 9:48 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 57 min |
| Jul 17, 10:04 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 56 min |
| Jul 17, 10:06 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 64 min |
| Jul 17, 10:42 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Richland | 63 min |
| Jul 17, 11:12 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 48 min |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.0 hours before the alert went out and 118 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
- 2 J/kg
- Mixed-layer CIN
- -342 J/kg
- Mixed-layer LCL
- 2538 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 3:00 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Carbon, Chouteau, Fergus, Golden Valley, Hill and 10 more | 6 hr |
Nearby
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.