Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1701

July 8, 20038 counties in Illinois; 38 counties in Iowa; 23 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 8:50 AM CDT for 8 counties in Illinois; 38 counties in Iowa; 23 counties in Missouri. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Jul 8, 2003, 8:50 AM CDT (13:50 UTC)
Expired
Jul 8, 2003, 10:45 AM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 69 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Guthrie County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Hancock County, IL, Henderson County, IL, McDonough County, IL, Mercer County, IL, Schuyler County, IL, Warren County, IL, Adair County, MO, Andrew County, MO, Caldwell County, MO, Clark County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 89 km from the middle of the area, began a volume at 13:52 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

Davenport, (KDVN), launched 12:00Z, 1.8 hours before the alert went out and 246 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, Davenport, at 12:00Z on 2003-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 823 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2003-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 square meters per square second.193958Sfc1 km3 km6 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
823 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
796 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.6

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 DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Henry and 9 more3 hr
Jul 7, 7:40 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more3 hr
Jul 7, 10:18 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 21 more57 min
Jul 7, 11:00 PM CDTSevere Thunderstorm WatchSPCCook, Iroquois, Kankakee, Lake, Vermilion5 hr
Jul 7, 11:50 PM CDTMesoscale DiscussionSPCIroquois, Vermilion85 min
Jul 8, 9:50 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more5 hr
Jul 8, 12:25 PM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Cumberland, Edwards, Effingham and 4 more95 min
Jul 8, 12:59 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more91 min
Jul 8, 1:21 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Champaign, Christian and 25 more24 min
Jul 8, 1:45 PM CDTTornado WatchSPCAdams, Brown, Bureau, Carroll, Cass, Champaign and 48 more5 hr
Jul 8, 3:40 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Cass, Champaign, Christian and 41 more95 min
Jul 8, 6:15 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Champaign, Christian, Clark and 37 more5 hr
Jul 8, 6:46 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, DeWitt, Douglas and 14 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, 2:52 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 49 more113 min
Jul 8, 5:13 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 19 more92 min

Nearby

Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Illinois, 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.