Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 644

May 10, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 10, 2004, 9:19 PM MDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: May 10, 2004, 9:19 PM MDT (03:19 UTC)
Expired: May 10, 2004, 11:15 PM MDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Fallon County, MT, Powder River County, MT, Banner County, NE, Scotts Bluff County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 150 km from the middle of the area, began a volume at 03:19 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 182May 10, 9:45 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 3.3 hours before the alert went out and 144 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: 1757 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 620 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 10, 7:06 PM MDT	Mesoscale Discussion	SPC	Powder River	114 min
May 10, 9:53 PM MDT	Mesoscale Discussion	SPC	Dawson, Garfield, McCone, Richland, Roosevelt	2 hr
May 10, 7:30 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Kimball, Scotts Bluff	5 hr
May 10, 9:45 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Box Butte, Chase, Cheyenne, Custer, Dawes and 21 more	4 hr
May 11, 12:27 AM MDT	Mesoscale Discussion	SPC	Arthur, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more	63 min
May 11, 12:32 PM MDT	Mesoscale Discussion	SPC	Cherry, Dawes, Sheridan	118 min
May 11, 12:55 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Cherry, Garden, Grant, Hooker, Keith and 4 more	5 hr
May 11, 1:00 PM MDT	Mesoscale Discussion	SPC	Chase, Dundy, Hayes, Hitchcock	2 hr
May 11, 1:40 PM MDT	Tornado Watch	SPC	Chase, Dawson, Dundy, Frontier, Furnas, Gosper and 5 more	6 hr
May 11, 4:04 PM MDT	Mesoscale Discussion	SPC	Cherry, Grant, Hooker, Keya Paha	116 min
May 11, 4:20 PM MDT	Mesoscale Discussion	SPC	Frontier, Hayes, Hitchcock, Lincoln, Red Willow	115 min
May 11, 5:40 PM MDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boyd, Brown, Holt, Keya Paha and 5 more	6 hr
May 11, 2:55 PM MDT	Tornado Watch	SPC	Beadle, Brown, Clark, Codington, Day, Deuel and 10 more	5 hr
May 11, 4:37 PM MDT	Mesoscale Discussion	SPC	Brown, Day, Edmunds, McPherson, Marshall, Roberts	113 min
May 11, 5:53 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Clark and 18 more	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Wyoming, 2004 Mesoscale Discussions in Montana, 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.