Alert archive / Iowa / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 694

July 9, 200361 counties in Iowa; 10 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 9, 2003, 1:10 AM CDT for 61 counties in Iowa; 10 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 9, 2003, 1:10 AM CDT (06:10 UTC)
Expired
Jul 9, 2003, 7:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 71 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clarke County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Monroe County, IA, Montgomery County, IA, O'Brien County, IA, Page County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Burt County, NE, Cass County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Otoe County, NE, Sarpy County, NE, Saunders County, NE, Thurston County, NE, Washington County, NE

The radar

The Des Moines radar (KDMX), 115 km from the middle of the area, began a volume at 06:11 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

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

IssuedProductOfficeCountiesLasted
Jul 9, 1:35 AM CDTSevere Thunderstorm WarningDMXCrawford55 min
Jul 9, 2:16 AM CDTSevere Thunderstorm WarningFSDCherokee29 min
Jul 9, 2:37 AM CDTFlash Flood WarningFSDCherokee113 min
Jul 9, 2:44 AM CDTSevere Thunderstorm WarningFSDCherokee31 min
Jul 9, 2:50 AM CDTSevere Thunderstorm WarningOAXDodge25 min
Jul 9, 2:58 AM CDTSevere Thunderstorm WarningOAXSaunders47 min
Jul 9, 3:14 AM CDTSevere Thunderstorm WarningOAXBurt, Douglas, Washington46 min
Jul 9, 3:17 AM CDTSevere Thunderstorm WarningOAXDodge13 min
Jul 9, 3:33 AM CDTFlash Flood WarningFSDIda3 hr
Jul 9, 3:39 AM CDTSevere Thunderstorm WarningOAXHarrison, Shelby51 min
Jul 9, 4:05 AM CDTFlash Flood WarningFSDBuena Vista3 hr
Jul 9, 4:57 AM CDTSevere Thunderstorm WarningDMXCarroll, Greene48 min
Jul 9, 5:21 AM CDTSevere Thunderstorm WarningDMXBoone, Dallas, Greene, Guthrie54 min
Jul 9, 5:46 AM CDTSevere Thunderstorm WarningDMXPolk, Story44 min
Jul 9, 6:14 AM CDTSevere Thunderstorm WarningDMXWarren46 min
Jul 9, 6:24 AM CDTSevere Thunderstorm WarningDMXJasper51 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, 6.2 hours before the alert went out and 150 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 2003-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1531 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 2003-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
1531 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
1503 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
235 m²/s²
Significant tornado parameter
0.4
Supercell composite
9.9

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
Jul 8, 8:59 PM CDTMesoscale DiscussionSPCAppanoose, Clarke, Davis, Decatur, Des Moines, Henry and 9 more2 hr
Jul 9, 4:15 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Buena Vista and 50 more2 hr
Jul 9, 1:08 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Black Hawk, Boone and 47 more67 min
Jul 9, 2:00 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 65 more6 hr
Jul 9, 3:15 PM CDTTornado WatchSPCAllamakee, Buchanan, Cedar, Clayton, Clinton, Delaware and 13 more6 hr
Jul 9, 5:38 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Benton, Black Hawk, Boone and 61 more97 min
Jul 8, 8:45 PM CDTTornado WatchSPCAntelope, Blaine, Boyd, Brown, Cedar, Cherry and 16 more5 hr
Jul 8, 11:30 PM CDTMesoscale DiscussionSPCBoone, Buffalo, Burt, Butler, Cherry, Clay and 28 more60 min
Jul 8, 11:45 PM CDTTornado WatchSPCAdams, Antelope, Blaine, Boone, Boyd, Brown and 42 more5 hr
Jul 9, 2:54 AM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 29 more96 min
Jul 9, 2:10 PM CDTMesoscale DiscussionSPCRichardson35 min
Jul 9, 3:55 PM CDTSevere Thunderstorm WatchSPCNemaha, Richardson6 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2003Severe Thunderstorm Watches in Nebraska, 2003Every severe thunderstorm watch 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.