Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 869

May 8, 200346 counties in Illinois; 59 counties in Iowa; 16 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 9:27 PM CDT for 46 counties in Illinois; 59 counties in Iowa; 16 counties in Missouri. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
May 8, 2003, 9:27 PM CDT (02:27 UTC)
Expired
May 8, 2003, 11:00 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 121 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin 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, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox 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, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Adair County, MO, Chariton County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Putnam County, MO, Ralls County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

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, 2.5 hours before the alert went out and 217 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 2003-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2003-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1197 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
483 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
May 8, 7:06 PM CDTMesoscale DiscussionSPCHamilton, White54 min
May 8, 7:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Hancock, Henderson, Pike, Scott5 hr
May 8, 9:10 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Cass, Champaign, DeKalb, DeWitt and 32 more6 hr
May 8, 11:50 PM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Henderson, Pike, Scott55 min
May 9, 12:05 AM CDTSevere Thunderstorm WatchSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 28 more6 hr
May 9, 2:02 PM CDTMesoscale DiscussionSPCEdwards, Lawrence, Wabash, Wayne, White2 hr
May 9, 2:48 PM CDTMesoscale DiscussionSPCClinton, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more117 min
May 9, 4:17 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 21 more28 min
May 9, 4:45 PM CDTTornado WatchSPCCalhoun, Greene, Morgan, Pike, Scott6 hr
May 9, 5:44 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Cumberland, DeWitt and 15 more31 min
May 9, 6:05 PM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clinton, Coles and 13 more5 hr
May 8, 7:13 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Buchanan, Caldwell, Carroll and 23 more2 hr
May 8, 9:00 PM CDTTornado WatchSPCAudrain, Benton, Boone, Callaway, Camden, Cole and 26 more5 hr

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.