Alert archive / Montana / Mesoscale Discussions in 2006

Mesoscale Discussion 905

May 20, 200622 counties in Montana; Big Horn County, Park County, Sheridan County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 20, 2006, 11:42 AM MDT for 22 counties in Montana; Big Horn County, Park County, Sheridan County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 20, 2006, 11:42 AM MDT (17:42 UTC)
Expired: May 20, 2006, 1:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 25 counties

Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Gallatin County, MT, Garfield County, MT, Golden Valley County, MT, Jefferson County, MT, Judith Basin County, MT, Madison County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Phillips County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Park County, WY, Sheridan County, WY

The radar

The Billings radar (KBLX), 73 km from the middle of the area, began a volume at 17:46 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 367May 20, 12:25 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
May 19, 6:47 PM MDT	Mesoscale Discussion	SPC	Mineral, Sanders	88 min
May 20, 12:24 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more	8 hr
May 20, 2:53 PM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Cascade, Fergus, Gallatin and 13 more	2 hr

Nearby

Mesoscale Discussions in Montana, 2006 Mesoscale Discussions in Wyoming, 2006 Every mesoscale discussion in 2006

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.