Alert archive / Colorado / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 458
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2013, 4:09 PM MDT for 10 counties in Colorado; 8 counties in Kansas; Dundy County, Hitchcock County, Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2013, 4:09 PM MDT (22:09 UTC)
- Expired
- Aug 1, 2013, 8:55 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Cheyenne County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Greeley County, KS, Logan County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Dundy County, NE, Hitchcock County, NE
The radar
The Denver radar (KFTG), 124 km from the middle of the area, began a volume at 22:09 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
- 10%
- 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 5:23 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 52 min |
| Aug 1, 5:41 PM MDT | Severe Thunderstorm Warning | GLD | Sherman, Thomas | 49 min |
| Aug 1, 6:11 PM MDT | Severe Thunderstorm Warning | GLD | Greeley, Wallace | 64 min |
| Aug 1, 6:13 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 47 min |
| Aug 1, 6:24 PM MDT | Severe Thunderstorm Warning | GLD | Logan, Thomas | 66 min |
| Aug 1, 7:27 PM MDT | Severe Thunderstorm Warning | GLD | Logan, Thomas | 33 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
Denver, CO (KDEN), launched 12:00Z, 10.2 hours before the alert went out and 23 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
- 294 J/kg
- Mixed-layer CIN
- -285 J/kg
- Mixed-layer LCL
- 1530 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 7:14 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Prowers | 91 min |
| Aug 1, 11:53 AM MDT | Mesoscale Discussion | SPC | Sedgwick | 2 hr |
| Aug 1, 4:06 PM MDT | Mesoscale Discussion | SPC | Cheyenne, Kit Carson, Lincoln, Logan, Morgan, Phillips and 2 more | 54 min |
| Aug 1, 7:16 AM MDT | Mesoscale Discussion | SPC | Antelope, Boone, Boyd, Butler, Cedar, Colfax and 23 more | 59 min |
| Aug 1, 12:22 PM MDT | Tornado Watch | SPC | Antelope, Blaine, Boone, Boyd, Brown, Buffalo and 26 more | 9 hr |
| Aug 1, 1:08 PM MDT | Severe Thunderstorm Watch | SPC | Burt, Cedar, Colfax, Cuming, Dakota, Dixon and 9 more | 8 hr |
| Aug 1, 2:25 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Arthur, Blaine, Boone, Box Butte and 57 more | 95 min |
| Aug 1, 2:59 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 11 more | 9 hr |
| Aug 1, 5:02 PM MDT | Mesoscale Discussion | SPC | Butler, Cass, Clay, Fillmore, Gage, Jefferson and 11 more | 58 min |
| Aug 1, 5:07 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Butler, Cass, Clay, Dawson and 26 more | 7 hr |
| Aug 1, 5:49 PM MDT | Mesoscale Discussion | SPC | Blaine, Brown, Cherry, Custer, Garfield, Grant and 13 more | 86 min |
Nearby
Severe Thunderstorm Watches in Colorado, 2013Severe Thunderstorm Watches in Kansas, 2013Severe Thunderstorm Watches in Nebraska, 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.