Alert archive / Colorado / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 670
The Storm Prediction Center issued this severe thunderstorm watch at Sep 16, 2007, 11:38 AM MST for 4 counties in Arizona; 10 counties in Colorado; 9 counties in Utah. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 16, 2007, 11:38 AM MST (18:38 UTC)
- Expired
- Sep 16, 2007, 7:00 PM MST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 23 counties
Apache County, AZ, Coconino County, AZ, Navajo County, AZ, Yavapai County, AZ, Delta County, CO, Dolores County, CO, Garfield County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Rio Blanco County, CO, San Miguel County, CO, Carbon County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Grand County, UT, Kane County, UT, San Juan County, UT, Uintah County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 217 km from the middle of the area, began a volume at 18:39 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 12:14 PM MST | Severe Thunderstorm Warning | GJT | San Juan | 46 min |
| Sep 16, 12:55 PM MST | Severe Thunderstorm Warning | GJT | San Juan | 50 min |
| Sep 16, 2:17 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 28 min |
| Sep 16, 3:02 PM MST | Severe Thunderstorm Warning | FGZ | Gila, Navajo | 28 min |
| Sep 16, 4:19 PM MST | Severe Thunderstorm Warning | GJT | Moffat, Rio Blanco | 41 min |
| Sep 16, 5:32 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 28 min |
| Sep 16, 6:23 PM MST | Flash Flood Warning | FGZ | Navajo | 2 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 1:51 PM MST | Mesoscale Discussion | SPC | Coconino, Navajo | 84 min |
| Sep 16, 3:42 PM MST | Mesoscale Discussion | SPC | Kit Carson, Morgan, Washington, Yuma | 93 min |
| Sep 16, 10:11 AM MST | Mesoscale Discussion | SPC | Carbon, Duchesne, Emery, Garfield, Grand, Kane and 3 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Colorado, 2007Severe Thunderstorm Watches in Utah, 2007Severe Thunderstorm Watches in Arizona, 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; radar from the NEXRAD Level II archive.