Alert archive / Utah / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 666
The Storm Prediction Center issued this severe thunderstorm watch at Sep 5, 2007, 12:51 PM MDT for 4 counties in Colorado; 22 counties in Utah; 5 counties in Wyoming. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2007, 12:51 PM MDT (18:51 UTC)
- Expired
- Sep 5, 2007, 8:19 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 31 counties
Garfield County, CO, Mesa County, CO, Moffat County, CO, Rio Blanco County, CO, Beaver County, UT, Cache County, UT, Carbon County, UT, Daggett County, UT, Davis County, UT, Duchesne County, UT, Emery County, UT, Grand County, UT, Juab County, UT, Millard County, UT, Morgan County, UT, Piute County, UT, Rich County, UT, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Summit County, UT, Uintah County, UT, Utah County, UT, Wasatch County, UT, Wayne County, UT, Weber County, UT, Fremont County, WY, Lincoln County, WY, Sublette County, WY, Sweetwater County, WY, Uinta County, WY
The radar
The Salt Lake City radar (KMTX), 193 km from the middle of the area, began a volume at 18:52 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 12:55 PM MDT | Severe Thunderstorm Warning | SLC | Emery | 50 min |
| Sep 5, 1:24 PM MDT | Severe Thunderstorm Warning | SLC | Morgan, Summit | 51 min |
| Sep 5, 1:31 PM MDT | Severe Thunderstorm Warning | RIW | Lincoln | 44 min |
| Sep 5, 1:37 PM MDT | Severe Thunderstorm Warning | RIW | Lincoln | 38 min |
| Sep 5, 1:41 PM MDT | Severe Thunderstorm Warning | SLC | Carbon, Emery | 49 min |
| Sep 5, 1:42 PM MDT | Tornado Warning | RIW | Lincoln | 38 min |
| Sep 5, 1:49 PM MDT | Severe Thunderstorm Warning | SLC | Morgan, Rich, Summit | 56 min |
| Sep 5, 2:03 PM MDT | Flash Flood Warning | RIW | Lincoln, Sublette, Teton | 3 hr |
| Sep 5, 2:13 PM MDT | Severe Thunderstorm Warning | RIW | Lincoln, Sublette | 47 min |
| Sep 5, 2:19 PM MDT | Flash Flood Warning | GJT | Mesa | 3 hr |
| Sep 5, 2:26 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Routt | 49 min |
| Sep 5, 2:37 PM MDT | Severe Thunderstorm Warning | GJT | Uintah | 38 min |
| Sep 5, 2:42 PM MDT | Severe Thunderstorm Warning | SLC | Uinta | 48 min |
| Sep 5, 2:52 PM MDT | Severe Thunderstorm Warning | RIW | Sublette | 24 min |
| Sep 5, 3:12 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 48 min |
| Sep 5, 3:32 PM MDT | Severe Thunderstorm Warning | GJT | Uintah | 43 min |
| Sep 5, 3:42 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 48 min |
| Sep 5, 3:58 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 47 min |
| Sep 5, 4:01 PM MDT | Severe Thunderstorm Warning | SLC | Utah | 29 min |
| Sep 5, 4:08 PM MDT | Severe Thunderstorm Warning | SLC | Juab, Tooele, Utah | 30 min |
| Sep 5, 4:23 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 52 min |
| Sep 5, 5:47 PM MDT | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 43 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 6.9 hours before the alert went out and 127 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
- 79 J/kg
- Mixed-layer CIN
- -161 J/kg
- Mixed-layer LCL
- 1532 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 12:20 PM MDT | Mesoscale Discussion | SPC | Moffat | 115 min |
| Sep 5, 2:49 PM MDT | Mesoscale Discussion | SPC | Mesa, Moffat, Rio Blanco | 116 min |
Nearby
Severe Thunderstorm Watches in Utah, 2007Severe Thunderstorm Watches in Wyoming, 2007Severe Thunderstorm Watches in Colorado, 2007Every severe thunderstorm watch in 2007
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.