Alert archive / Iowa / Tornado Watches in 2008

Tornado Watch 457

June 4, 2008Hancock County, Illinois; 70 counties in Iowa; 7 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Jun 4, 2008, 11:56 PM CDT for Hancock County, Illinois; 70 counties in Iowa; 7 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 4, 2008, 11:56 PM CDT (04:56 UTC)
Expired
Jun 5, 2008, 5:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 78 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Cherokee County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Henry County, IA, Humboldt County, IA, Ida County, IA, Iowa 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, Monona County, IA, Monroe County, IA, Muscatine County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Shelby 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, Woodbury County, IA, Wright County, IA, Hancock County, IL, Burt County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Thurston County, NE, Washington County, NE

The radar

The Des Moines radar (KDMX), 65 km from the middle of the area, began a volume at 04:59 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 5, 12:11 AM CDTFlash Flood WarningDMXButler6 hr
Jun 5, 12:17 AM CDTSevere Thunderstorm WarningDMXMadison, Warren43 min
Jun 5, 12:18 AM CDTSevere Thunderstorm WarningDMXButler42 min
Jun 5, 12:35 AM CDTSevere Thunderstorm WarningDMXAdams, Taylor40 min
Jun 5, 12:50 AM CDTSevere Thunderstorm WarningDMXJasper, Marion, Polk, Warren40 min
Jun 5, 12:59 AM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Polk, Story46 min
Jun 5, 1:05 AM CDTSevere Thunderstorm WarningDMXBlack Hawk, Grundy40 min
Jun 5, 1:14 AM CDTTornado WarningDMXJasper, Marshall, Story31 min
Jun 5, 1:19 AM CDTSevere Thunderstorm WarningDMXAdair, Adams, Madison, Ringgold, Union41 min
Jun 5, 1:40 AM CDTSevere Thunderstorm WarningDMXPoweshiek, Tama35 min
Jun 5, 1:44 AM CDTFlash Flood WarningDMXAdams, Ringgold, Taylor, Union6 hr
Jun 5, 1:48 AM CDTSevere Thunderstorm WarningDMXJasper, Marshall11 min
Jun 5, 1:51 AM CDTSevere Thunderstorm WarningDMXRinggold, Taylor39 min
Jun 5, 2:02 AM CDTSevere Thunderstorm WarningDMXClarke, Madison, Union, Warren43 min
Jun 5, 2:06 AM CDTSevere Thunderstorm WarningDVNBenton, Buchanan, Delaware54 min
Jun 5, 2:09 AM CDTFlash Flood WarningDMXBlack Hawk6 hr
Jun 5, 2:12 AM CDTSevere Thunderstorm WarningDMXClarke, Decatur43 min
Jun 5, 2:18 AM CDTSevere Thunderstorm WarningDVNBenton, Iowa, Johnson, Linn57 min
Jun 5, 2:26 AM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Marion, Warren49 min
Jun 5, 2:33 AM CDTTornado WarningDMXClarke, Lucas21 min
Jun 5, 4:50 AM CDTSevere Thunderstorm WarningDMXMahaska, Wapello25 min

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 00:00Z, 4.9 hours before the alert went out and 189 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, Omaha, NE at 00:00Z on 2008-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2024 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, Omaha, NE at 00:00Z on 2008-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 224 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
2024 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
774 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
224 m²/s²
0-3 km storm-relative helicity
331 m²/s²
Significant tornado parameter
3.7
Supercell composite
18.9

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
Jun 4, 7:02 PM CDTTornado WatchSPCBureau, Carroll, Champaign, DeKalb, DeWitt, Ford and 29 more8 hr
Jun 5, 1:38 AM CDTMesoscale DiscussionSPCBoone, Cook, DuPage, Jo Daviess, Kane, Lake and 3 more3 hr
Jun 5, 4:11 AM CDTMesoscale DiscussionSPCCarroll, Jo Daviess, Lee, Mercer, Ogle, Rock Island and 3 more94 min
Jun 5, 4:59 AM CDTTornado WatchSPCBoone, Carroll, Henry, Jo Daviess, Lee, Mercer and 5 more6 hr
Jun 5, 6:46 AM CDTMesoscale DiscussionSPCBoone, Carroll, Henry, Jo Daviess, McHenry, Mercer and 5 more119 min
Jun 5, 9:30 AM CDTMesoscale DiscussionSPCCook, DuPage, Grundy, Kendall, LaSalle, Will90 min
Jun 4, 7:55 PM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page, Pottawattamie65 min
Jun 4, 8:49 PM CDTTornado WatchSPCFremont, Mills, Montgomery, Page, Pottawattamie7 hr
Jun 4, 9:33 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more87 min
Jun 4, 11:14 PM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page, Pottawattamie, Taylor2 hr
Jun 5, 3:06 AM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page, Pottawattamie84 min
Jun 5, 10:11 AM CDTMesoscale DiscussionSPCCherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux and 1 more94 min
Jun 5, 10:35 AM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page, Pottawattamie85 min
Jun 5, 10:55 AM CDTTornado Watch PDSSPCBuena Vista, Cherokee, Clay, Crawford, Dickinson, Fremont and 15 more8 hr
Jun 5, 2:01 PM CDTMesoscale DiscussionSPCDickinson, Emmet, Lyon, Osceola59 min
Jun 5, 5:10 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 39 more95 min
Jun 5, 5:29 PM CDTMesoscale DiscussionSPCLyon91 min
Jun 5, 5:50 PM CDTTornado Watch PDSSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 44 more7 hr
Jun 5, 5:07 AM CDTMesoscale DiscussionSPCBlaine, Boone, Buffalo, Chase, Custer, Dawson and 29 more2 hr
Jun 5, 5:33 AM CDTSevere Thunderstorm WatchSPCArthur, Chase, Custer, Dawson, Dundy, Frontier and 10 more6 hr
Jun 5, 7:23 AM CDTMesoscale DiscussionSPCChase, Custer, Dawson, Dundy, Frontier, Furnas and 8 more67 min
Jun 5, 11:08 AM CDTMesoscale DiscussionSPCChase, Dundy, Hayes, Hitchcock, Perkins67 min
Jun 5, 12:44 PM CDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Buffalo, Burt and 52 more91 min
Jun 5, 1:29 PM CDTSevere Thunderstorm WatchSPCDundy, Hitchcock, Red Willow6 hr
Jun 5, 3:09 PM CDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Brown, Buffalo and 21 more2 hr
Jun 5, 4:38 PM CDTMesoscale DiscussionSPCRichardson37 min
Jun 5, 6:22 PM CDTMesoscale DiscussionSPCNemaha, Pawnee, Richardson53 min
Jun 5, 12:04 PM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Brookings, Brule, Charles Mix, Davison and 12 more6 hr

Nearby

Tornado Watches in Iowa, 2008Tornado Watches in Nebraska, 2008Tornado Watches in Illinois, 2008Every tornado watch in 2008

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.