Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 1215

June 12, 200410 counties in Iowa; Atchison County, Missouri; 8 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2004, 12:43 PM CDT for 10 counties in Iowa; Atchison County, Missouri; 8 counties in Nebraska. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2004, 12:43 PM CDT (17:43 UTC)
Expired: Jun 12, 2004, 2:15 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Audubon County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Atchison County, MO, Burt County, NE, Cass County, NE, Douglas County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Sarpy County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 72 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 5.7 hours before the alert went out and 72 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: 232 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 2084 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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
Jun 11, 7:57 PM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Calhoun and 26 more	93 min
Jun 11, 9:35 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Benton, Black Hawk, Bremer, Buchanan, Butler and 44 more	4 hr
Jun 12, 11:45 AM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 31 more	7 hr
Jun 12, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Benton, Boone, Cedar, Clarke, Clinton and 33 more	5 hr
Jun 12, 5:00 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 29 more	90 min
Jun 11, 11:34 PM CDT	Mesoscale Discussion	SPC	Buchanan, Caldwell, Carroll, Clay, Clinton, Daviess and 5 more	116 min
Jun 12, 2:18 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Camden, Cass, Cedar and 18 more	87 min
Jun 12, 10:30 AM CDT	Mesoscale Discussion	SPC	Atchison, Barton, Bates, Benton, Camden, Cass and 29 more	2 hr
Jun 12, 11:38 AM CDT	Mesoscale Discussion	SPC	Barry, Butler, Carter, Dunklin, Howell, McDonald and 9 more	2 hr
Jun 12, 1:35 PM CDT	Severe Thunderstorm Watch	SPC	Dunklin, New Madrid, Pemiscot	5 hr
Jun 12, 3:10 PM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Christian, Dade, Douglas, Greene and 9 more	6 hr
Jun 12, 3:14 PM CDT	Mesoscale Discussion	SPC	Dunklin, Pemiscot	2 hr
Jun 12, 3:51 PM CDT	Mesoscale Discussion	SPC	Bollinger, Cape Girardeau, Mississippi, Perry, Sainte Genevieve, Scott	84 min
Jun 12, 4:15 PM CDT	Severe Thunderstorm Watch	SPC	Cape Girardeau, Mississippi, Scott	5 hr
Jun 12, 4:36 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Caldwell, Carroll, Cass and 24 more	84 min
Jun 12, 6:08 PM CDT	Mesoscale Discussion	SPC	Cape Girardeau, Mississippi, Scott	37 min
Jun 12, 6:15 PM CDT	Tornado Watch	SPC	Adair, Andrew, Atchison, Bates, Benton, Buchanan and 31 more	5 hr
Jun 12, 1:53 PM CDT	Mesoscale Discussion	SPC	Franklin, Jefferson, Nuckolls, Thayer, Webster	2 hr

Nearby

Mesoscale Discussions in Iowa, 2004 Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in Missouri, 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.