Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 1534

July 5, 200414 counties in Illinois; 18 counties in Iowa; 6 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2004, 9:29 PM CDT for 14 counties in Illinois; 18 counties in Iowa; 6 counties in Wisconsin. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Jul 5, 2004, 9:29 PM CDT (02:29 UTC)
Expired
Jul 5, 2004, 10:30 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
All 38 counties

Allamakee County, IA, Buchanan County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Howard County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Winneshiek County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Lee County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Crawford County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI

The radar

The Quad Cities radar (KDVN), 64 km from the middle of the area, began a volume at 02:30 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.5 hours before the alert went out and 63 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 2004-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1346 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 2004-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 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
1346 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1014 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

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 5, 7:05 PM CDTMesoscale DiscussionSPCBond, Calhoun, Greene, Jersey, Macoupin, Madison and 2 more55 min
Jul 5, 9:10 PM CDTSevere Thunderstorm WatchSPCBond, Christian, Clark, Clay, Clinton, Coles and 18 more4 hr
Jul 5, 11:14 PM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 13 more91 min
Jul 5, 11:44 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clark, Clay, Clinton, Coles and 26 more91 min
Jul 6, 6:50 AM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 19 more4 hr
Jul 6, 9:00 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Champaign, Christian and 28 more60 min
Jul 6, 11:01 AM CDTMesoscale DiscussionSPCAlexander, Bond, Clay, Clinton, Crawford, Cumberland and 29 more59 min
Jul 6, 12:10 PM CDTSevere Thunderstorm WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more6 hr
Jul 6, 2:34 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more56 min
Jul 6, 2:53 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Clinton and 33 more37 min
Jul 6, 3:25 PM CDTSevere Thunderstorm WatchSPCBond, Champaign, Christian, Clark, Clay, Coles and 30 more8 hr
Jul 6, 5:37 PM CDTMesoscale DiscussionSPCAlexander, Johnson, Pulaski, Union53 min

Nearby

Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Wisconsin, 2004Every mesoscale discussion 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.