Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1520

July 18, 20074 counties in Nebraska; 16 counties in South Dakota; 6 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2007, 12:51 PM MDT for 4 counties in Nebraska; 16 counties in South Dakota; 6 counties in Wyoming. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2007, 12:51 PM MDT (18:51 UTC)
Expired: Jul 18, 2007, 1:45 PM MDT
In force: 54 min
Issued by: the Storm Prediction Center

All 26 counties

Cherry County, NE, Dawes County, NE, Keya Paha County, NE, Sheridan County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Tripp County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Johnson County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 35 km from the middle of the area, began a volume at 18:52 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 531Jul 18, 1:55 PM MDT

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
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
Jul 18, 1:53 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Hughes and 11 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2007 Mesoscale Discussions in Wyoming, 2007 Mesoscale Discussions in Nebraska, 2007 Every mesoscale discussion 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.