Alert archive / South Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1530

July 21, 20126 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2012, 1:54 PM MDT for 6 counties in South Dakota; 4 counties in Wyoming. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2012, 1:54 PM MDT (19:54 UTC)
Expired: Jul 21, 2012, 3:30 PM MDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Butte County, SD, Custer County, SD, Fall River County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 121 km from the middle of the area, began a volume at 19:56 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.

The watches that followed

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

Severe Thunderstorm Watch 500Jul 21, 4:45 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 20, 6:00 PM MDT	Mesoscale Discussion	SPC	Custer, Haakon, Lawrence, Meade, Pennington	90 min
Jul 21, 4:25 PM MDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence, Meade, Perkins	65 min
Jul 21, 4:41 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 6 more	7 hr
Jul 21, 5:12 PM MDT	Mesoscale Discussion	SPC	Albany, Goshen, Laramie, Platte	78 min

Nearby

Mesoscale Discussions in South Dakota, 2012 Mesoscale Discussions in Wyoming, 2012 Every mesoscale discussion in 2012

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.