Alert archive / Illinois / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 466

June 14, 200450 counties in Illinois; 7 counties in Indiana; 4 counties in Iowa

The Storm Prediction Center issued this severe thunderstorm watch at Jun 14, 2004, 6:50 AM CDT for 50 counties in Illinois; 7 counties in Indiana; 4 counties in Iowa. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 14, 2004, 6:50 AM CDT (11:50 UTC)
Expired
Jun 14, 2004, 1:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 61 counties

Clinton County, IA, Dubuque County, IA, Jackson County, IA, Scott County, IA, Boone County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Fountain County, IN, Lake County, IN, Newton County, IN, Parke County, IN, Vermillion County, IN, Warren County, IN

The radar

The Quad Cities radar (KDVN), 93 km from the middle of the area, began a volume at 11:50 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.

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, 11.8 hours before the alert went out and 87 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 2004-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 791 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 00:00Z on 2004-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939587897Sfc1 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
791 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1142 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
20 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
Jun 14, 5:25 AM CDTMesoscale DiscussionSPCBureau, DeKalb, Grundy, Henderson, Henry, Kendall and 12 more3 hr
Jun 14, 7:42 AM CDTMesoscale DiscussionSPCBureau, Carroll, Cass, DeKalb, DeWitt, Ford and 31 more2 hr
Jun 14, 10:03 AM CDTMesoscale DiscussionSPCBoone, Bureau, Champaign, Cook, DeKalb, DeWitt and 32 more57 min
Jun 14, 3:15 PM CDTMesoscale DiscussionSPCBond, Calhoun, Greene, Jersey, Macoupin, Madison and 2 more90 min
Jun 14, 4:10 PM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clay, Clinton, Edwards, Effingham and 29 more6 hr
Jun 13, 7:30 PM CDTMesoscale DiscussionSPCBartholomew, Dearborn, Decatur, Fayette, Franklin, Randolph and 4 more90 min
Jun 14, 9:06 AM CDTMesoscale DiscussionSPCAdams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more54 min
Jun 14, 9:40 AM CDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 32 more7 hr
Jun 14, 10:22 AM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Cass, DeKalb, Delaware and 20 more53 min
Jun 14, 12:29 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Clinton, DeKalb and 16 more91 min
Jun 13, 11:18 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 12 more2 hr
Jun 13, 11:56 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 22 more3 hr
Jun 14, 3:05 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 68 more6 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2004Severe Thunderstorm Watches in Indiana, 2004Severe Thunderstorm Watches in Iowa, 2004Every severe thunderstorm watch in 2004

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.