Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1679

July 7, 200337 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 3:30 PM CDT for 37 counties in Iowa. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 7, 2003, 3:30 PM CDT (20:30 UTC)
Expired
Jul 7, 2003, 6:30 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 37 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Guthrie County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 46 km from the middle of the area, began a volume at 20:30 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.5 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

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 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, 1:25 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 16 more95 min
Jul 7, 2:40 AM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw and 12 more4 hr
Jul 7, 4:22 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Chickasaw, Clayton and 5 more83 min
Jul 7, 6:23 AM CDTMesoscale DiscussionSPCCedar, Clinton, Delaware, Dubuque, Iowa, Jackson and 5 more97 min
Jul 7, 12:14 PM CDTMesoscale DiscussionSPCClinton, Des Moines, Lee, Louisa, Muscatine, Scott61 min
Jul 7, 2:35 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Delaware, Dubuque115 min
Jul 7, 3:35 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Benton, Cass, Cedar and 29 more5 hr

Nearby

Mesoscale Discussions in Iowa, 2003Every mesoscale discussion 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.