Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 592

May 8, 200414 counties in Montana; 10 counties in North Dakota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 8, 2004, 11:44 AM MDT for 14 counties in Montana; 10 counties in North Dakota; 6 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 8, 2004, 11:44 AM MDT (17:44 UTC)
Expired: May 8, 2004, 2:15 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 30 counties

Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Phillips County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Divide County, ND, Golden Valley County, ND, Hettinger County, ND, McKenzie County, ND, Slope County, ND, Stark County, ND, Williams County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD

The radar

The Glasgow radar (KGGW), 217 km from the middle of the area, began a volume at 17:43 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 162May 8, 1:35 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 5.7 hours before the alert went out and 217 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2223 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 317 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 8, 1:35 PM MDT	Severe Thunderstorm Watch	SPC	Carter, Daniels, Dawson, Fallon, McCone, Prairie and 5 more	5 hr
May 8, 2:17 PM MDT	Mesoscale Discussion	SPC	Daniels, Dawson, McCone, Richland, Roosevelt, Sheridan and 1 more	58 min
May 8, 4:11 PM MDT	Mesoscale Discussion	SPC	Carter, Daniels, Fallon, Richland, Roosevelt, Sheridan and 1 more	64 min
May 8, 5:00 PM MDT	Severe Thunderstorm Watch	SPC	Benson, Bottineau, Burke, Burleigh, Dickey, Emmons and 20 more	4 hr
May 7, 6:34 PM MDT	Mesoscale Discussion	SPC	Butte, Lawrence, Meade	86 min
May 7, 8:53 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Lincoln, Minnehaha, Moody, Turner and 2 more	97 min
May 7, 9:20 PM MDT	Severe Thunderstorm Watch	SPC	Bon Homme, Clay, Davison, Hanson, Hutchinson, Lincoln and 6 more	6 hr
May 8, 1:27 PM MDT	Mesoscale Discussion	SPC	Union	3 hr

Nearby

Mesoscale Discussions in Montana, 2004 Mesoscale Discussions in North Dakota, 2004 Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.