Alert archive / Colorado / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 532
The Storm Prediction Center issued this severe thunderstorm watch at Sep 22, 2013, 10:53 AM MDT for 16 counties in Colorado; 8 counties in Utah. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 22, 2013, 10:53 AM MDT (16:53 UTC)
- Expired
- Sep 22, 2013, 4:45 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 24 counties
Archuleta County, CO, Delta County, CO, Dolores County, CO, Eagle County, CO, Garfield County, CO, Gunnison County, CO, Hinsdale County, CO, La Plata County, CO, Mesa County, CO, Montezuma County, CO, Montrose County, CO, Ouray County, CO, Pitkin County, CO, Rio Blanco County, CO, San Juan County, CO, San Miguel County, CO, Carbon County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Grand County, UT, San Juan County, UT, Uintah County, UT, Wayne County, UT
The radar
The Grand Junction radar (KGJX), 80 km from the middle of the area, began a volume at 16:56 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
- 70%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 95%
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 22, 10:57 AM MDT | Flash Flood Warning | SLC | Garfield, Kane, San Juan, Wayne | 3 hr |
| Sep 22, 11:08 AM MDT | Flash Flood Warning | GJT | Garfield | 4 hr |
| Sep 22, 11:43 AM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
| Sep 22, 12:21 PM MDT | Severe Thunderstorm Warning | GJT | San Juan | 39 min |
| Sep 22, 12:23 PM MDT | Flash Flood Warning | GJT | La Plata | 6 hr |
| Sep 22, 12:30 PM MDT | Flash Flood Warning | GJT | San Miguel | 3 hr |
| Sep 22, 12:31 PM MDT | Severe Thunderstorm Warning | GJT | San Juan | 44 min |
| Sep 22, 12:50 PM MDT | Severe Thunderstorm Warning | GJT | Montrose, San Miguel | 40 min |
| Sep 22, 1:16 PM MDT | Severe Thunderstorm Warning | GJT | La Plata, Montezuma | 44 min |
| Sep 22, 1:25 PM MDT | Severe Thunderstorm Warning | GJT | Delta, Mesa, Montrose | 50 min |
| Sep 22, 1:49 PM MDT | Severe Thunderstorm Warning | GJT | La Plata | 41 min |
| Sep 22, 2:26 PM MDT | Severe Thunderstorm Warning | GJT | La Plata | 49 min |
| Sep 22, 2:59 PM MDT | Severe Thunderstorm Warning | GJT | Archuleta, Hinsdale, La Plata | 46 min |
| Sep 22, 3:08 PM MDT | Flash Flood Warning | GJT | La Plata, Montezuma | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 4.9 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
- 143 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1807 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 171 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 22, 9:46 AM MDT | Mesoscale Discussion | SPC | Delta, Dolores, Eagle, Garfield, La Plata, Mesa and 9 more | 44 min |
| Sep 22, 2:08 PM MDT | Mesoscale Discussion | SPC | Archuleta, Chaffee, Conejos, Delta, Dolores, Eagle and 17 more | 97 min |
| Sep 22, 2:58 PM MDT | Severe Thunderstorm Watch | SPC | Alamosa, Chaffee, Conejos, Costilla, Crowley, Custer and 16 more | 6 hr |
| Sep 22, 4:10 PM MDT | Mesoscale Discussion | SPC | Logan, Morgan, Phillips, Sedgwick, Weld | 2 hr |
| Sep 22, 5:45 PM MDT | Mesoscale Discussion | SPC | Alamosa, Conejos, Costilla, Custer, Huerfano, Rio Grande | 60 min |
Nearby
Severe Thunderstorm Watches in Colorado, 2013Severe Thunderstorm Watches in Utah, 2013Every severe thunderstorm watch in 2013
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.