Alert archive / Colorado / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 739
The Storm Prediction Center issued this severe thunderstorm watch at Sep 20, 1997, 2:00 PM MDT for 12 counties in Colorado; Daggett County, Grand County, Uintah County, Utah. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 1997, 2:00 PM MDT (20:00 UTC)
- Expired
- Sep 20, 1997, 7:00 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Delta County, CO, Dolores County, CO, Garfield County, CO, Hinsdale County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Ouray County, CO, Rio Blanco County, CO, Routt County, CO, San Juan County, CO, San Miguel County, CO, Daggett County, UT, Grand County, UT, Uintah County, UT
The radar
The Grand Junction radar (KGJX), 79 km from the middle of the area, began a volume at 20:03 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
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 2:01 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 29 min |
| Sep 20, 2:27 PM MDT | Severe Thunderstorm Warning | GJT | Grand | 48 min |
| Sep 20, 2:31 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 64 min |
| Sep 20, 2:43 PM MDT | Severe Thunderstorm Warning | GJT | Garfield | 62 min |
| Sep 20, 3:18 PM MDT | Severe Thunderstorm Warning | GJT | Grand | 62 min |
| Sep 20, 3:24 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 61 min |
| Sep 20, 3:43 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Routt | 47 min |
| Sep 20, 3:55 PM MDT | Severe Thunderstorm Warning | GJT | Garfield | 30 min |
| Sep 20, 4:14 PM MDT | Severe Thunderstorm Warning | GJT | Delta | 46 min |
| Sep 20, 4:34 PM MDT | Severe Thunderstorm Warning | GJT | Routt | 46 min |
| Sep 20, 5:04 PM MDT | Severe Thunderstorm Warning | GJT | Garfield, Mesa | 61 min |
| Sep 20, 5:48 PM MDT | Severe Thunderstorm Warning | GJT | Delta, Montrose | 32 min |
| Sep 20, 6:17 PM MDT | Severe Thunderstorm Warning | GJT | Delta | 33 min |
| Sep 20, 6:41 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 49 min |
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 8.0 hours before the alert went out and 56 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
- 197 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 696 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 209 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.6
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
Nearby
Severe Thunderstorm Watches in Colorado, 1997Severe Thunderstorm Watches in Utah, 1997Every severe thunderstorm watch in 1997
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.