Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 1528

July 5, 20047 counties in Illinois; 46 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2004, 6:30 PM CDT for 7 counties in Illinois; 46 counties in Iowa. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jul 5, 2004, 6:30 PM CDT (23:30 UTC)
Expired
Jul 5, 2004, 7:30 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 53 counties

Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Henry County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marshall County, IA, Mitchell County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Webster County, IA, Worth County, IA, Wright County, IA, Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Mercer County, IL, Rock Island County, IL, Whiteside County, IL

The radar

The Des Moines radar (KDMX), 110 km from the middle of the area, began a volume at 23:34 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 12:00Z, 11.5 hours before the alert went out and 164 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 2004-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 477 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 2004-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.19395878Sfc1 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
477 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
1211 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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, 6:55 AM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Christian, Clinton, Coles, Cumberland and 12 more4 hr
Jul 5, 9:12 AM CDTMesoscale DiscussionSPCBond, Calhoun, Christian, Clark, Clay, Clinton and 34 more63 min
Jul 5, 9:45 AM CDTSevere Thunderstorm WatchSPCClay, Edwards, Franklin, Gallatin, Hamilton, Jackson and 8 more4 hr
Jul 5, 12:08 PM CDTMesoscale DiscussionSPCEdwards, Hardin, Lawrence, Richland, Wabash67 min
Jul 5, 3:00 PM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Henderson, McDonough, Mercer and 3 more60 min
Jul 5, 3:43 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Jackson, Jersey, Madison and 5 more92 min
Jul 5, 4:00 PM CDTTornado WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 15 more6 hr
Jul 5, 4:20 PM CDTTornado WatchSPCBureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 9 more6 hr
Jul 4, 11:05 PM CDTSevere Thunderstorm WatchSPCFremont, Mills5 hr
Jul 5, 1:16 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 25 more89 min
Jul 5, 2:00 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Calhoun and 31 more5 hr
Jul 5, 4:45 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Buena Vista and 30 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Illinois, 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.