Alert archive / Minnesota / Mesoscale Discussions in 2004

Mesoscale Discussion 658

May 11, 200411 counties in Minnesota; 10 counties in North Dakota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 5:37 PM CDT for 11 counties in Minnesota; 10 counties in North Dakota; 6 counties in South Dakota. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 11, 2004, 5:37 PM CDT (22:37 UTC)
Expired: May 11, 2004, 7:30 PM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 27 counties

Becker County, MN, Clay County, MN, Clearwater County, MN, Hubbard County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Grand Forks County, ND, LaMoure County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Brown County, SD, Day County, SD, Edmunds County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 121 km from the middle of the area, began a volume at 22:36 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.6 hours before the alert went out and 178 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: 48 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 1079 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 355 m²/s²
0-3 km storm-relative helicity: 454 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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 11, 1:32 PM CDT	Mesoscale Discussion	SPC	Big Stone, Grant, Stevens, Traverse	118 min
May 11, 3:55 PM CDT	Tornado Watch	SPC	Big Stone, Chippewa, Douglas, Grant, Kandiyohi, Lac qui Parle and 9 more	5 hr
May 10, 8:06 PM CDT	Mesoscale Discussion	SPC	Custer, Fall River, Lawrence	114 min
May 10, 10:19 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Harding, Lawrence	116 min
May 10, 10:45 PM CDT	Severe Thunderstorm Watch	SPC	Fall River	4 hr
May 11, 1:27 AM CDT	Mesoscale Discussion	SPC	Bennett, Haakon, Hughes, Hyde, Jackson, Jones and 9 more	63 min
May 11, 1:55 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Campbell, Corson, Dewey, Haakon, Jackson and 7 more	5 hr
May 11, 5:04 PM CDT	Mesoscale Discussion	SPC	Bennett, Brule, Buffalo, Faulk, Hand, Hughes and 8 more	116 min
May 11, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Bon Homme, Brule, Buffalo, Charles Mix, Davison and 12 more	6 hr
May 11, 6:53 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Clark and 18 more	2 hr

Nearby

Mesoscale Discussions in Minnesota, 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.