Alert archive / Iowa / Mesoscale Discussions in 2003
Mesoscale Discussion 1924
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 8:08 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2003, 8:08 PM CDT (01:08 UTC)
- Expired
- Jul 20, 2003, 10:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 80 counties
Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Cedar County, IA, Clarke County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Grundy County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Tama County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Adair County, MO, Clark County, MO, Daviess County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO, Grant County, WI, Lafayette County, WI
The radar
The Quad Cities radar (KDVN), 68 km from the middle of the area, began a volume at 01:09 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 00:00Z, 1.1 hours before the alert went out and 75 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.
- Mixed-layer CAPE
- 3041 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 1003 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 9.6
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:30 PM CDT | Tornado Watch | SPC | Carroll, Henry, Jo Daviess, Mercer, Rock Island, Whiteside | 6 hr |
| Jul 20, 9:48 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 12 more | 117 min |
| Jul 20, 10:15 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 12 more | 7 hr |
| Jul 20, 11:14 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, DeWitt, Ford and 29 more | 2 hr |
| Jul 20, 11:30 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, Champaign, DeWitt, Douglas and 21 more | 6 hr |
| Jul 21, 1:56 AM CDT | Mesoscale Discussion | SPC | Champaign, Douglas, Edgar, Ford, Iroquois, Macon and 2 more | 2 hr |
| Jul 21, 4:12 AM CDT | Mesoscale Discussion | SPC | Clay, Crawford, Edwards, Effingham, Franklin, Hamilton and 7 more | 2 hr |
| Jul 21, 3:26 PM CDT | Mesoscale Discussion | SPC | Cook | 94 min |
| Jul 20, 7:49 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Calhoun, Carroll, Cass and 17 more | 56 min |
| Jul 20, 8:50 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 16 more | 5 hr |
| Jul 20, 7:05 PM CDT | Severe Thunderstorm Watch | SPC | Douglas, Howell, Oregon, Ozark, Shannon | 5 hr |
| Jul 20, 10:43 PM CDT | Mesoscale Discussion | SPC | Holt, Nodaway | 62 min |
Nearby
Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 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.