Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1614

July 4, 200326 counties in Iowa; Faribault County, Jackson County, Martin County, Minnesota; 25 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 8:43 PM CDT for 26 counties in Iowa; Faribault County, Jackson County, Martin County, Minnesota; 25 counties in Nebraska. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2003, 8:43 PM CDT (01:43 UTC)
Expired: Jul 4, 2003, 9:45 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 54 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Greene County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Faribault County, MN, Jackson County, MN, Martin County, MN, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Hall County, NE, Hamilton County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE

The radar

The Omaha radar (KOAX), 76 km from the middle of the area, began a volume at 01:46 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 640Jul 4, 9:05 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.7 hours before the alert went out and 76 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: 2181 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1546 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 386 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

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
Jul 4, 9:05 PM CDT	Tornado Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 31 more	6 hr
Jul 4, 10:45 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Benton, Black Hawk, Bremer, Buchanan and 68 more	90 min
Jul 4, 11:25 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Allamakee, Appanoose, Benton, Black Hawk and 56 more	7 hr
Jul 5, 2:31 AM CDT	Mesoscale Discussion	SPC	Cedar, Clayton, Clinton, Delaware, Des Moines, Dubuque and 10 more	89 min
Jul 5, 12:19 PM CDT	Mesoscale Discussion	SPC	Harrison, Monona	2 hr
Jul 5, 3:10 PM CDT	Severe Thunderstorm Watch	SPC	Harrison, Mills, Monona, Plymouth, Pottawattamie, Woodbury	7 hr
Jul 5, 5:18 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 37 more	57 min
Jul 5, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Cass, Clarke and 30 more	6 hr
Jul 5, 6:42 PM CDT	Mesoscale Discussion	SPC	Fremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more	93 min
Jul 4, 7:20 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more	5 hr
Jul 4, 9:52 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more	83 min
Jul 4, 11:21 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Garfield, Holt and 6 more	24 min
Jul 5, 6:44 AM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Brown, Cherry, Garfield and 12 more	2 hr
Jul 5, 3:23 PM CDT	Mesoscale Discussion	SPC	Chase, Dundy, Frontier, Hayes, Hitchcock, Red Willow	2 hr
Jul 5, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	Chase, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more	6 hr
Jul 5, 5:06 PM CDT	Mesoscale Discussion	SPC	Chase, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more	84 min

Nearby

Mesoscale Discussions in Iowa, 2003 Mesoscale Discussions in Nebraska, 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.