Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 725

May 4, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 4, 2003, 9:48 AM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 4, 2003, 9:48 AM CDT (14:48 UTC)
Expired: May 4, 2003, 11:45 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center

All 50 counties

Audubon County, IA, Buena Vista County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Nobles County, MN, Rock County, MN, Burt County, NE, Cass County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Thurston County, NE, Washington County, NE, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 73 km from the middle of the area, began a volume at 14:50 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

Omaha, NE (KOAX), launched 12:00Z, 2.8 hours before the alert went out and 73 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: 558 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 375 m²/s²
0-3 km storm-relative helicity: 509 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 3, 11:46 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Fremont, Harrison, Mills, Monona and 5 more	59 min
May 4, 12:10 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 18 more	6 hr
May 4, 2:58 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 37 more	92 min
May 4, 4:50 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 23 more	6 hr
May 4, 7:43 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 15 more	2 hr
May 4, 12:14 PM CDT	Mesoscale Discussion	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie, Taylor	2 hr
May 4, 12:45 PM CDT	Tornado Watch	SPC	Adams, Cass, Fremont, Mills, Montgomery, Page and 2 more	6 hr
May 4, 2:22 PM CDT	Mesoscale Discussion	SPC	Fremont, Mills, Montgomery, Page, Pottawattamie, Taylor	113 min
May 4, 3:56 PM CDT	Mesoscale Discussion	SPC	Adair, Appanoose, Audubon, Boone, Carroll, Cass and 22 more	2 hr
May 4, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Davis, Des Moines, Lee, Van Buren	6 hr
May 4, 5:50 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Clarke, Dallas, Decatur and 14 more	5 hr
May 3, 8:33 PM CDT	Mesoscale Discussion	SPC	Arthur, Box Butte, Chase, Cherry, Cheyenne, Deuel and 10 more	57 min
May 3, 9:42 PM CDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Brown, Buffalo, Chase and 33 more	33 min
May 3, 10:20 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Arthur, Blaine, Boone, Boyd and 41 more	6 hr
May 4, 11:40 AM CDT	Tornado Watch	SPC	Adams, Buffalo, Clay, Fillmore, Gage, Hall and 11 more	6 hr
May 4, 1:55 PM CDT	Mesoscale Discussion	SPC	Clay, Fillmore, Gage, Hamilton, Lancaster, Saline and 2 more	2 hr
May 3, 9:25 PM CDT	Mesoscale Discussion	SPC	Bennett, Buffalo, Campbell, Corson, Dewey, Edmunds and 13 more	65 min

Nearby

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