Alert archive / Iowa / Mesoscale Discussions in 2003

Mesoscale Discussion 1618

July 4, 20036 states

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2003, 10:45 PM CDT for 6 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jul 4, 2003, 10:45 PM CDT (03:45 UTC)
Expired
Jul 5, 2003, 12:15 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 129 counties

Adair County, IA, Audubon County, IA, Benton County, IA, Black Hawk 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, Chickasaw County, IA, Clay County, IA, Clayton County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Dickinson County, IA, Dubuque County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Kossuth County, IA, Linn County, IA, Louisa County, IA, Lyon County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Mitchell County, IA, Monona County, IA, Muscatine County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Sac County, IA, Scott County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Jo Daviess County, IL, Rock Island County, IL, Blue Earth County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Adams County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Union County, SD, Grant County, WI

The radar

The Des Moines radar (KDMX), 25 km from the middle of the area, began a volume at 03:44 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

Omaha, NE (KOAX), launched 00:00Z, 3.8 hours before the alert went out and 209 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 2003-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2181 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 2003-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 234 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
2181 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
1546 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
234 m²/s²
0-3 km storm-relative helicity
386 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.4

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 4, 8:58 PM CDTMesoscale DiscussionSPCDuPage, Grundy, Iroquois, Kane, Kankakee, Kendall and 1 more62 min
Jul 4, 10:09 PM CDTMesoscale DiscussionSPCBrown, Cass, Champaign, DeWitt, Douglas, Ford and 20 more2 hr
Jul 4, 11:25 PM CDTSevere Thunderstorm WatchSPCCarroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 6 more7 hr
Jul 5, 2:31 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more89 min
Jul 5, 3:40 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more4 hr
Jul 5, 5:43 AM CDTMesoscale DiscussionSPCCook, Kankakee, Lake, Will92 min
Jul 5, 12:55 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more3 hr
Jul 5, 4:34 PM CDTMesoscale DiscussionSPCChampaign, Ford, Iroquois, Vermilion56 min
Jul 5, 5:18 PM CDTMesoscale DiscussionSPCCass, DeWitt, Fulton, Hancock, Henderson, Henry and 16 more57 min
Jul 5, 5:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Champaign, Christian, Clark and 36 more6 hr
Jul 4, 8:43 PM CDTMesoscale DiscussionSPCAudubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 20 more62 min
Jul 4, 9:05 PM CDTTornado WatchSPCAudubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 31 more6 hr
Jul 5, 12:19 PM CDTMesoscale DiscussionSPCHarrison, Monona2 hr
Jul 5, 3:10 PM CDTSevere Thunderstorm WatchSPCHarrison, Mills, Monona, Plymouth, Pottawattamie, Woodbury7 hr
Jul 5, 6:42 PM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more93 min
Jul 4, 7:20 PM CDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more5 hr
Jul 4, 9:52 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more83 min
Jul 4, 11:21 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boyd, Brown, Garfield, Holt and 6 more24 min
Jul 5, 6:44 AM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Brown, Cherry, Garfield and 12 more2 hr
Jul 5, 3:23 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Hayes, Hitchcock, Red Willow2 hr
Jul 5, 3:45 PM CDTSevere Thunderstorm WatchSPCChase, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more6 hr
Jul 5, 5:06 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more84 min
Jul 5, 4:10 PM CDTMesoscale DiscussionSPCAurora, Beadle, Brule, Buffalo, Clark, Dewey and 20 more65 min
Jul 5, 4:35 PM CDTSevere Thunderstorm WatchSPCBennett, Brule, Buffalo, Butte, Campbell, Charles Mix and 28 more5 hr

Nearby

Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Minnesota, 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.