Alert archive / Montana / Mesoscale Discussions in 2009

Mesoscale Discussion 1879

August 13, 200919 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2009, 2:39 PM MDT for 19 counties in Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 13, 2009, 2:39 PM MDT (20:39 UTC)
Expired: Aug 13, 2009, 4:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Beaverhead County, MT, Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Deer Lodge County, MT, Fergus County, MT, Gallatin 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, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 112 km from the middle of the area, began a volume at 20:42 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 701Aug 13, 4:00 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
Aug 13, 3:59 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Blaine, Broadwater, Carbon, Cascade, Chouteau and 14 more	7 hr

Nearby

Mesoscale Discussions in Montana, 2009 Every mesoscale discussion in 2009

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.