Alert archive / Iowa / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 312

May 8, 20036 counties in Illinois; 36 counties in Iowa; 15 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 8, 2003, 7:55 PM CDT for 6 counties in Illinois; 36 counties in Iowa; 15 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2003, 7:55 PM CDT (00:55 UTC)
Expired
May 9, 2003, 1:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 57 counties

Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Clarke County, IA, Davis County, IA, Des Moines County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Adams County, IL, Brown County, IL, Hancock County, IL, Henderson County, IL, Pike County, IL, Scott County, IL, Adair County, MO, Chariton County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Putnam County, MO, Ralls County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The radar

The Des Moines radar (KDMX), 132 km from the middle of the area, began a volume at 00:55 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.

Warnings issued inside it

12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 8, 8:07 PM CDTSevere Thunderstorm WarningDMXStory23 min
May 8, 8:11 PM CDTSevere Thunderstorm WarningDMXBlack Hawk34 min
May 8, 8:13 PM CDTSevere Thunderstorm WarningDVNLee, Van Buren47 min
May 8, 8:21 PM CDTSevere Thunderstorm WarningLSXAdams39 min
May 8, 8:39 PM CDTSevere Thunderstorm WarningDVNHenderson51 min
May 8, 8:46 PM CDTFlash Flood WarningDMXPolk, Story6 hr
May 8, 8:49 PM CDTSevere Thunderstorm WarningLSXAdams, Brown, Pike26 min
May 8, 8:50 PM CDTSevere Thunderstorm WarningDVNHancock, McDonough25 min
May 8, 9:18 PM CDTSevere Thunderstorm WarningDVNDes Moines, Louisa27 min
May 8, 10:18 PM CDTSevere Thunderstorm WarningILXCass, Morgan, Scott57 min
May 8, 10:26 PM CDTSevere Thunderstorm WarningLSXMonroe49 min
May 9, 12:04 AM CDTSevere Thunderstorm WarningLSXPike, Ralls41 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.9 hours before the alert went out and 142 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 00:00Z on 2003-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Davenport, at 00:00Z on 2003-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1197 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
483 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 7:06 PM CDTMesoscale DiscussionSPCHamilton, White54 min
May 8, 9:10 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Cass, Champaign, DeKalb, DeWitt and 32 more6 hr
May 8, 9:27 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Carroll, Cass, Champaign and 40 more93 min
May 8, 11:50 PM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Henderson, Pike, Scott55 min
May 9, 12:05 AM CDTSevere Thunderstorm WatchSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 28 more6 hr
May 9, 2:02 PM CDTMesoscale DiscussionSPCEdwards, Lawrence, Wabash, Wayne, White2 hr
May 9, 2:48 PM CDTMesoscale DiscussionSPCClinton, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more117 min
May 9, 4:17 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 21 more28 min
May 9, 4:45 PM CDTTornado WatchSPCCalhoun, Greene, Morgan, Pike, Scott6 hr
May 9, 5:44 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Cumberland, DeWitt and 15 more31 min
May 9, 6:05 PM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clinton, Coles and 13 more5 hr
May 8, 7:13 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Buchanan, Caldwell, Carroll and 23 more2 hr
May 8, 9:00 PM CDTTornado WatchSPCAudrain, Benton, Boone, Callaway, Camden, Cole and 26 more5 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2003Severe Thunderstorm Watches in Missouri, 2003Severe Thunderstorm Watches in Illinois, 2003Every severe thunderstorm watch 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.