Alert archive / South Dakota / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 531
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2007, 1:53 PM MDT for 17 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2007, 1:53 PM MDT (19:53 UTC)
- Expired
- Jul 18, 2007, 9:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
Counties Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 9 km from the middle of the area, began a volume at 19:54 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
- 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
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 2:07 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 68 min |
| Jul 18, 2:43 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 92 min |
| Jul 18, 3:10 PM MDT | Severe Thunderstorm Warning | UNR | Custer | 32 min |
| Jul 18, 3:29 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 27 min |
| Jul 18, 3:59 PM MDT | Severe Thunderstorm Warning | UNR | 69 min | |
| Jul 18, 4:02 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 32 min |
| Jul 18, 4:04 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 41 min |
| Jul 18, 4:40 PM MDT | Severe Thunderstorm Warning | UNR | Custer | 43 min |
| Jul 18, 5:00 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding | 43 min |
| Jul 18, 5:06 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 54 min |
| Jul 18, 6:44 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 61 min |
| Jul 18, 7:08 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence | 46 min |
| Jul 18, 7:47 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 58 min |
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 |
|---|---|---|---|---|
| Jul 18, 12:51 PM MDT | Mesoscale Discussion | SPC | Cherry, Dawes, Keya Paha, Sheridan | 54 min |
| Jul 18, 3:15 PM MDT | Mesoscale Discussion | SPC | Boyd, Cedar, Dixon, Knox | 3 hr |
| Jul 18, 5:05 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Boyd, Brown, Cherry, Garden, Garfield and 9 more | 3 hr |
| Jul 17, 10:24 PM MDT | Mesoscale Discussion | SPC | Lincoln, Turner, Union | 96 min |
| Jul 18, 11:47 AM MDT | Mesoscale Discussion | SPC | Lincoln, Minnehaha | 2 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2007Severe Thunderstorm Watches in Wyoming, 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.