Alert archive / Utah / Tornado Watches in 2010
Tornado Watch 694
The Storm Prediction Center issued this tornado watch at Oct 6, 2010, 9:29 AM MST for 5 counties in Arizona; 10 counties in Utah. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 6, 2010, 9:29 AM MST (16:29 UTC)
- Expired
- Oct 6, 2010, 4:12 PM MST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Apache County, AZ, Coconino County, AZ, Gila County, AZ, Navajo County, AZ, Yavapai County, AZ, Carbon County, UT, Emery County, UT, Garfield County, UT, Grand County, UT, Kane County, UT, Piute County, UT, San Juan County, UT, Sanpete County, UT, Sevier County, UT, Wayne County, UT
The radar
The Flagstaff radar (KFSX), 162 km from the middle of the area, began a volume at 16:31 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
- 60%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
40 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 6, 9:30 AM MST | Tornado Warning | FGZ | Coconino, Yavapai | 45 min |
| Oct 6, 9:43 AM MST | Tornado Warning | FGZ | Coconino, Yavapai | 32 min |
| Oct 6, 10:00 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 45 min |
| Oct 6, 10:08 AM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Oct 6, 10:12 AM MST | Severe Thunderstorm Warning | SLC | Kane, San Juan | 48 min |
| Oct 6, 10:13 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 62 min |
| Oct 6, 10:14 AM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 46 min |
| Oct 6, 10:25 AM MST | Tornado Warning | SLC | Kane, San Juan | 20 min |
| Oct 6, 10:32 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 43 min |
| Oct 6, 10:35 AM MST | Tornado Warning | FGZ | Yavapai | 40 min |
| Oct 6, 10:51 AM MST | Tornado Warning | FGZ | Coconino | 39 min |
| Oct 6, 11:01 AM MST | Tornado Warning | FGZ | Coconino, Yavapai | 29 min |
| Oct 6, 11:02 AM MST | Severe Thunderstorm Warning | SLC | Garfield, Kane, San Juan | 43 min |
| Oct 6, 11:15 AM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 45 min |
| Oct 6, 11:24 AM MST | Tornado Warning | FGZ | Coconino, Yavapai | 41 min |
| Oct 6, 11:29 AM MST | Tornado Warning | FGZ | Coconino | 31 min |
| Oct 6, 11:34 AM MST | Tornado Warning | FGZ | Coconino, Yavapai | 26 min |
| Oct 6, 11:45 AM MST | Severe Thunderstorm Warning | SLC | Garfield, San Juan, Wayne | 60 min |
| Oct 6, 12:01 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 44 min |
| Oct 6, 12:09 PM MST | Tornado Warning | FGZ | Coconino | 36 min |
| Oct 6, 12:11 PM MST | Tornado Warning | FGZ | Coconino | 34 min |
| Oct 6, 12:16 PM MST | Tornado Warning | FGZ | Coconino, Yavapai | 29 min |
| Oct 6, 12:47 PM MST | Tornado Warning | FGZ | Coconino | 16 min |
| Oct 6, 12:47 PM MST | Severe Thunderstorm Warning | SLC | Emery, Wayne | 43 min |
| Oct 6, 12:50 PM MST | Severe Thunderstorm Warning | SLC | Emery | 40 min |
| Oct 6, 1:15 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 31 min |
| Oct 6, 1:17 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 43 min |
| Oct 6, 1:29 PM MST | Severe Thunderstorm Warning | SLC | Emery, Wayne | 46 min |
| Oct 6, 1:29 PM MST | Severe Thunderstorm Warning | SLC | Emery | 61 min |
| Oct 6, 1:32 PM MST | Severe Thunderstorm Warning | GJT | Grand | 43 min |
| Oct 6, 1:39 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 36 min |
| Oct 6, 1:41 PM MST | Severe Thunderstorm Warning | GJT | San Juan | 49 min |
| Oct 6, 2:03 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 19 min |
| Oct 6, 2:12 PM MST | Severe Thunderstorm Warning | GJT | San Juan | 48 min |
| Oct 6, 2:13 PM MST | Severe Thunderstorm Warning | GJT | Grand | 47 min |
| Oct 6, 2:15 PM MST | Severe Thunderstorm Warning | GJT | Grand, San Juan | 45 min |
| Oct 6, 2:15 PM MST | Severe Thunderstorm Warning | SLC | Carbon, Duchesne | 27 min |
| Oct 6, 2:16 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 14 min |
| Oct 6, 2:59 PM MST | Severe Thunderstorm Warning | GJT | Grand, Uintah | 46 min |
| Oct 6, 3:14 PM MST | Tornado Warning | GJT | Grand, Uintah | 16 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 4.5 hours before the alert went out and 95 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
- 376 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 638 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 320 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 5, 6:06 PM MST | Mesoscale Discussion | SPC | Gila, Maricopa, Pima, Pinal, Yavapai | 54 min |
| Oct 5, 11:57 PM MST | Mesoscale Discussion | SPC | Gila, Maricopa, Pinal | 2 hr |
| Oct 6, 3:20 AM MST | Mesoscale Discussion | SPC | Gila, Maricopa, Pinal, Yavapai | 115 min |
| Oct 6, 4:07 AM MST | Severe Thunderstorm Watch | SPC | Coconino, Gila, Maricopa, Navajo, Yavapai | 6 hr |
| Oct 6, 6:51 AM MST | Tornado Watch | SPC | Coconino, Yavapai | 3 hr |
| Oct 6, 6:57 AM MST | Mesoscale Discussion | SPC | Yavapai | 2 hr |
| Oct 6, 8:23 AM MST | Mesoscale Discussion | SPC | Coconino | 2 hr |
| Oct 6, 8:38 AM MST | Mesoscale Discussion | SPC | Apache | 2 hr |
| Oct 6, 11:08 AM MST | Mesoscale Discussion | SPC | Apache, Navajo | 2 hr |
| Oct 6, 11:12 AM MST | Mesoscale Discussion | SPC | Cochise, Graham, Greenlee | 63 min |
| Oct 6, 2:43 PM MST | Mesoscale Discussion | SPC | Apache, Navajo | 92 min |
| Oct 6, 1:58 PM MST | Severe Thunderstorm Watch | SPC | Uintah | 5 hr |
Nearby
Tornado Watches in Utah, 2010Tornado Watches in Arizona, 2010Every tornado watch in 2010
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.