Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1477

June 23, 200334 counties in Iowa; 9 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2003, 8:08 PM CDT for 34 counties in Iowa; 9 counties in Minnesota. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 23, 2003, 8:08 PM CDT (01:08 UTC)
Expired: Jun 23, 2003, 9:15 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

All 43 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Crawford County, IA, Dallas County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Madison County, IA, Mitchell County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Union County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Le Sueur County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Waseca County, MN

The radar

The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 01:07 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.

Tornado Watch 572Jun 23, 8:55 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.1 hours before the alert went out and 284 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: 1955 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1314 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.7

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 23, 8:55 PM CDT	Tornado Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cerro Gordo and 24 more	4 hr
Jun 23, 9:10 PM CDT	Mesoscale Discussion	SPC	Cherokee, Dickinson, Lyon, O'Brien, Osceola, Sioux	65 min
Jun 23, 10:38 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cherokee, Clay, Humboldt, Ida and 9 more	67 min
Jun 23, 10:50 PM CDT	Tornado Watch	SPC	Plymouth	5 hr
Jun 23, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	Lyon, O'Brien, Osceola, Sioux	6 hr
Jun 24, 12:35 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Buena Vista, Calhoun, Carroll, Cerro Gordo, Cherokee and 24 more	5 hr
Jun 24, 1:52 AM CDT	Mesoscale Discussion	SPC	Plymouth	53 min
Jun 24, 2:05 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Allamakee, Benton, Black Hawk, Boone and 39 more	5 hr
Jun 24, 2:44 AM CDT	Mesoscale Discussion	SPC	Lyon, Osceola, Sioux	2 hr
Jun 24, 3:09 AM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Calhoun, Carroll, Cerro Gordo, Cherokee and 12 more	96 min
Jun 24, 11:43 AM CDT	Mesoscale Discussion	SPC	Adams, Cass, Fremont, Harrison, Mills, Montgomery and 3 more	2 hr
Jun 24, 2:15 PM CDT	Tornado Watch	SPC	Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux	8 hr
Jun 24, 3:56 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 6 more	64 min
Jun 24, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Audubon, Boone, Buena Vista, Butler, Calhoun and 30 more	5 hr
Jun 24, 5:59 PM CDT	Mesoscale Discussion	SPC	Lyon, O'Brien, Osceola, Plymouth, Sioux	61 min
Jun 24, 1:21 AM CDT	Mesoscale Discussion	SPC	Big Stone, Lac qui Parle, Stevens, Yellow Medicine	114 min
Jun 24, 4:20 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Big Stone, Carlton, Chippewa and 21 more	6 hr
Jun 24, 5:00 PM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Brown, Carver, Dakota, Dodge, Faribault and 18 more	5 hr

Nearby

Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Minnesota, 2003 Every mesoscale discussion in 2003

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.