Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1698

July 8, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 2:52 AM CDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Jul 8, 2003, 2:52 AM CDT (07:52 UTC)
Expired
Jul 8, 2003, 4:45 AM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 80 counties

Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cedar County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Kossuth County, IA, Linn County, IA, Louisa County, IA, Lyon County, IA, Mahaska County, IA, Marshall County, IA, Muscatine County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Scott County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Washington County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Nobles County, MN, Rock County, MN, Boyd County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 138 km from the middle of the area, began a volume at 07:55 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 00:00Z, 7.9 hours before the alert went out and 171 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2003-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4419 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2003-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
4419 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1109 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
3.2
Supercell composite
22.5

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.

IssuedProductOfficeCountiesLasted
Jul 7, 7:16 PM CDTMesoscale DiscussionSPCAdair, Audubon, Benton, Cass, Cedar, Clinton and 20 more3 hr
Jul 7, 10:15 PM CDTMesoscale DiscussionSPCCrawford, Harrison, Ida, Monona, Plymouth, Pottawattamie and 1 more3 hr
Jul 7, 10:20 PM CDTSevere Thunderstorm WatchSPCCherokee, Crawford, Fremont, Harrison, Ida, Mills and 4 more7 hr
Jul 7, 11:25 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Kossuth, Lyon, O'Brien and 3 more2 hr
Jul 7, 11:40 PM CDTSevere Thunderstorm WatchSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux5 hr
Jul 8, 1:34 AM CDTMesoscale DiscussionSPCCherokee, Crawford, Fremont, Harrison, Ida, Mills and 5 more116 min
Jul 8, 8:50 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Cass and 32 more115 min
Jul 8, 9:50 AM CDTSevere Thunderstorm WatchSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 33 more5 hr
Jul 8, 12:59 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Buchanan, Cedar, Clinton, Delaware and 17 more91 min
Jul 8, 1:45 PM CDTTornado WatchSPCCedar, Clinton, Des Moines, Henry, Jackson, Johnson and 7 more5 hr
Jul 8, 3:40 PM CDTMesoscale DiscussionSPCDes Moines, Henry, Lee95 min
Jul 8, 5:13 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 19 more92 min
Jul 8, 6:15 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 22 more5 hr
Jul 8, 6:46 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Lee, Ringgold, Taylor and 2 more3 hr
Jul 7, 7:48 PM CDTMesoscale DiscussionSPCArthur, Box Butte, Chase, Cheyenne, Deuel, Dundy and 14 more117 min
Jul 8, 2:36 PM CDTMesoscale DiscussionSPCBox Butte, Dawes, Sioux84 min
Jul 8, 10:44 AM CDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Clark and 28 more91 min
Jul 8, 3:05 PM CDTTornado WatchSPCBennett, Butte, Custer, Fall River, Harding, Jackson and 5 more7 hr
Jul 8, 5:38 PM CDTMesoscale DiscussionSPCBennett, Butte, Custer, Fall River, Harding, Lawrence and 4 more67 min

Nearby

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