Alert archive / Iowa / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 308

May 27, 20049 counties in Illinois; 28 counties in Iowa; 17 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2004, 11:55 AM CDT for 9 counties in Illinois; 28 counties in Iowa; 17 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 27, 2004, 11:55 AM CDT (16:55 UTC)
Expired: May 27, 2004, 6:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 54 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Fremont County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Hancock County, IL, Henderson County, IL, McDonough County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Warren County, IL, Adair County, MO, Atchison County, MO, Clark County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 97 km from the middle of the area, began a volume at 16:55 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.

Warnings issued inside it

17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 27, 12:00 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	45 min
May 27, 12:03 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	27 min
May 27, 12:14 PM CDT	Severe Thunderstorm Warning	OAX	Page	46 min
May 27, 12:30 PM CDT	Severe Thunderstorm Warning	DMX	Decatur	45 min
May 27, 12:38 PM CDT	Flash Flood Warning	DMX	Adams	3 hr
May 27, 12:41 PM CDT	Tornado Warning	DMX	Appanoose, Wayne	49 min
May 27, 1:01 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	44 min
May 27, 1:05 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	40 min
May 27, 1:08 PM CDT	Severe Thunderstorm Warning	EAX	Nodaway	52 min
May 27, 1:29 PM CDT	Severe Thunderstorm Warning	EAX	Worth	61 min
May 27, 1:42 PM CDT	Tornado Warning	EAX	Worth	48 min
May 27, 1:58 PM CDT	Tornado Warning	EAX	Gentry	47 min
May 27, 2:03 PM CDT	Tornado Warning	EAX	Harrison	57 min
May 27, 2:41 PM CDT	Tornado Warning	EAX	Daviess, Grundy	49 min
May 27, 3:23 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Pike	52 min
May 27, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Shelby	62 min
May 27, 5:44 PM CDT	Flash Flood Warning	LSX	Calhoun, Greene, Pike	4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 4.9 hours before the alert went out and 248 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 97 J/kg
Mixed-layer CIN: -239 J/kg
Mixed-layer LCL: 906 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 7:57 PM CDT	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more	63 min
May 26, 8:55 PM CDT	Tornado Watch	SPC	Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 16 more	5 hr
May 26, 9:36 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more	54 min
May 26, 11:14 PM CDT	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more	2 hr
May 27, 1:53 AM CDT	Mesoscale Discussion	SPC	Christian, Clark, Clay, Coles, Crawford, Cumberland and 9 more	3 hr
May 27, 11:10 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calhoun, Cass, Christian, DeWitt and 25 more	2 hr
May 27, 1:07 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, DeWitt, Douglas, Edgar and 12 more	113 min
May 27, 1:30 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Coles, DeWitt, Douglas and 22 more	7 hr
May 27, 1:52 PM CDT	Mesoscale Discussion	SPC	Adams, Calhoun, Greene, Jersey, Macoupin, Pike and 1 more	113 min
May 27, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Calhoun, Clinton, Fayette, Franklin, Greene and 12 more	7 hr
May 27, 3:12 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 13 more	2 hr
May 27, 3:37 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Clay, Clinton, Edwards, Effingham and 22 more	113 min
May 27, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Clay, Crawford, Cumberland, Edwards, Effingham and 7 more	4 hr
May 27, 5:01 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jackson and 11 more	89 min
May 27, 6:00 PM CDT	Mesoscale Discussion	SPC	Champaign, DeWitt, Douglas, Edgar, Macon, Morgan and 4 more	90 min
May 26, 8:29 PM CDT	Mesoscale Discussion	SPC	McDonald	91 min
May 26, 8:30 PM CDT	Tornado Watch	SPC	Barton, Bates, Benton, Camden, Cedar, Dade and 15 more	6 hr
May 26, 11:40 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Clay, Cooper, Henry, Howard, Jackson and 6 more	5 hr
May 27, 1:16 AM CDT	Mesoscale Discussion	SPC	Carroll, Cass, Clay, Cooper, Howard, Jackson and 6 more	119 min
May 27, 1:50 AM CDT	Tornado Watch	SPC	Barton, Camden, Cedar, Christian, Dade, Dallas and 15 more	4 hr
May 27, 3:27 AM CDT	Mesoscale Discussion	SPC	Cedar, Christian, Dade, Dallas, Douglas, Greene and 12 more	2 hr
May 27, 3:55 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Caldwell, Carroll, Cass and 14 more	95 min

Nearby

Severe Thunderstorm Watches in Iowa, 2004 Severe Thunderstorm Watches in Missouri, 2004 Severe Thunderstorm Watches in Illinois, 2004 Every severe thunderstorm watch 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.