Alert archive / Iowa / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 243

May 6, 20027 counties in Illinois; 24 counties in Iowa; 19 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at May 6, 2002, 5:30 PM CDT for 7 counties in Illinois; 24 counties in Iowa; 19 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2002, 5:30 PM CDT (22:30 UTC)
Expired
May 6, 2002, 11:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 50 counties

Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Grundy County, IA, Hardin County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Mahaska County, IA, Marshall County, IA, Poweshiek County, IA, Tama County, IA, Boone County, IL, Carroll County, IL, Jo Daviess County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Quad Cities radar (KDVN), 116 km from the middle of the area, began a volume at 22:31 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 6, 6:28 PM CDTSevere Thunderstorm WarningMKXColumbia17 min
May 6, 6:38 PM CDTSevere Thunderstorm WarningMKXDodge52 min
May 6, 8:33 PM CDTSevere Thunderstorm WarningARXGrant32 min
May 6, 9:01 PM CDTSevere Thunderstorm WarningMKXDodge44 min
May 6, 9:06 PM CDTSevere Thunderstorm WarningDVNDubuque39 min
May 6, 9:11 PM CDTSevere Thunderstorm WarningDMXTama34 min
May 6, 9:20 PM CDTSevere Thunderstorm WarningARXGrant40 min
May 6, 9:35 PM CDTSevere Thunderstorm WarningMKXIowa40 min
May 6, 9:52 PM CDTSevere Thunderstorm WarningDMXTama23 min
May 6, 10:00 PM CDTSevere Thunderstorm WarningMKXLafayette45 min
May 6, 10:04 PM CDTSevere Thunderstorm WarningMKXDane41 min
May 6, 10:30 PM CDTSevere Thunderstorm WarningMKXDodge, Jefferson60 min

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 118 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 2002-05-06Temperature 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 12:00Z on 2002-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
1406 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
97 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 6, 7:45 AM CDTSevere Thunderstorm WatchSPCAdams, Calhoun, Greene, Jersey, Madison, Pike and 1 more4 hr
May 6, 10:45 AM CDTSevere Thunderstorm WatchSPCBond, Clay, Clinton, Edwards, Effingham, Fayette and 20 more5 hr
May 5, 8:00 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 51 more5 hr
May 6, 3:30 PM CDTSevere Thunderstorm WatchSPCAllamakee, Black Hawk, Bremer, Buchanan, Chickasaw, Clayton and 5 more5 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Wisconsin, 2002Severe Thunderstorm Watches in Illinois, 2002Every severe thunderstorm watch in 2002

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.