Alert archive / Iowa / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 669

July 7, 2003Rock Island County, Illinois; 35 counties in Iowa

The Storm Prediction Center issued this severe thunderstorm watch at Jul 7, 2003, 3:35 PM CDT for Rock Island County, Illinois; 35 counties in Iowa. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 7, 2003, 3:35 PM CDT (20:35 UTC)
Expired
Jul 7, 2003, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 36 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Benton County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Dallas County, IA, Guthrie County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Rock Island County, IL

The radar

The Des Moines radar (KDMX), 44 km from the middle of the area, began a volume at 20:35 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

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

IssuedProductOfficeCountiesLasted
Jul 7, 4:05 PM CDTTornado WarningDMXJasper, Marion55 min
Jul 7, 4:44 PM CDTSevere Thunderstorm WarningDMXJasper46 min
Jul 7, 4:55 PM CDTSevere Thunderstorm WarningDMXPolk50 min
Jul 7, 5:34 PM CDTSevere Thunderstorm WarningDMXJasper, Marion, Warren56 min
Jul 7, 5:41 PM CDTSevere Thunderstorm WarningDMXJasper49 min
Jul 7, 5:44 PM CDTSevere Thunderstorm WarningDMXPolk61 min
Jul 7, 6:24 PM CDTSevere Thunderstorm WarningDVNScott51 min
Jul 7, 6:53 PM CDTSevere Thunderstorm WarningDVNRock Island, Whiteside67 min
Jul 7, 7:12 PM CDTSevere Thunderstorm WarningDVNRock Island63 min
Jul 7, 7:15 PM CDTSevere Thunderstorm WarningDVNScott55 min
Jul 7, 7:40 PM CDTSevere Thunderstorm WarningDMXMarshall50 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 12:00Z, 8.6 hours before the alert went out and 229 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 2003-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 611 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, Davenport, at 12:00Z on 2003-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
611 J/kg
Mixed-layer CIN
-254 J/kg
Mixed-layer LCL
1669 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 6, 8:46 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 10 more59 min
Jul 7, 1:25 AM CDTMesoscale DiscussionSPCJo Daviess, Stephenson, Winnebago95 min
Jul 7, 2:40 AM CDTSevere Thunderstorm WatchSPCJo Daviess4 hr
Jul 7, 4:22 AM CDTMesoscale DiscussionSPCJo Daviess, Stephenson83 min
Jul 7, 6:23 AM CDTMesoscale DiscussionSPCBureau, Carroll, DeKalb, Grundy, Henry, Kendall and 9 more97 min
Jul 7, 8:30 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Ford, Grundy, Iroquois and 13 more60 min
Jul 7, 8:45 AM CDTSevere Thunderstorm WatchSPCChampaign, Cook, DeWitt, Ford, Grundy, Iroquois and 6 more4 hr
Jul 7, 10:14 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Ford, Iroquois, McLean, Piatt and 1 more61 min
Jul 7, 12:14 PM CDTMesoscale DiscussionSPCBond, Brown, Cass, Champaign, Christian, Clark and 42 more61 min
Jul 7, 2:35 PM CDTMesoscale DiscussionSPCBoone, Jo Daviess, McHenry, Stephenson, Winnebago115 min
Jul 7, 4:34 PM CDTMesoscale DiscussionSPCIroquois, Kankakee, Vermilion, Will56 min
Jul 6, 7:45 PM CDTTornado WatchSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux6 hr
Jul 6, 8:57 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 35 more3 hr
Jul 6, 9:20 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Buena Vista and 62 more6 hr
Jul 6, 11:06 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Buena Vista and 62 more114 min
Jul 7, 3:30 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Cass and 31 more3 hr

Nearby

Severe Thunderstorm Watches in Iowa, 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.