Alert archive / Iowa / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 144

April 24, 20024 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 24, 2002, 7:30 AM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2002, 7:30 AM CDT (12:30 UTC)
Expired
Apr 24, 2002, 1:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 83 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Jasper County, IA, Jefferson County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Leavenworth County, KS, Nemaha County, KS, Wyandotte County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Ray County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO, Worth County, MO, Cass County, NE, Gage County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE

The radar

The Des Moines radar (KDMX), 155 km from the middle of the area, began a volume at 12:31 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

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

IssuedProductOfficeCountiesLasted
Apr 24, 7:43 AM CDTSevere Thunderstorm WarningOAXMills, Pottawattamie32 min
Apr 24, 7:44 AM CDTSevere Thunderstorm WarningOAXCass, Otoe, Sarpy61 min
Apr 24, 8:08 AM CDTSevere Thunderstorm WarningDMXAudubon, Carroll37 min
Apr 24, 8:14 AM CDTSevere Thunderstorm WarningOAXMills46 min
Apr 24, 8:25 AM CDTSevere Thunderstorm WarningOAXFremont50 min
Apr 24, 8:33 AM CDTSevere Thunderstorm WarningOAXMontgomery, Pottawattamie42 min
Apr 24, 8:38 AM CDTSevere Thunderstorm WarningEAXAtchison37 min
Apr 24, 8:39 AM CDTSevere Thunderstorm WarningOAXPage51 min
Apr 24, 9:43 AM CDTSevere Thunderstorm WarningDMXClarke32 min
Apr 24, 10:10 AM CDTSevere Thunderstorm WarningEAXWorth50 min
Apr 24, 10:22 AM CDTSevere Thunderstorm WarningDMXRinggold38 min
Apr 24, 10:39 AM CDTSevere Thunderstorm WarningEAXHarrison51 min
Apr 24, 10:46 AM CDTSevere Thunderstorm WarningDMXDecatur44 min
Apr 24, 10:54 AM CDTSevere Thunderstorm WarningDMXMahaska, Monroe, Wapello36 min
Apr 24, 11:09 AM CDTSevere Thunderstorm WarningEAXMercer36 min
Apr 24, 11:30 AM CDTSevere Thunderstorm WarningEAXSchuyler30 min
Apr 24, 11:33 AM CDTSevere Thunderstorm WarningDMXDavis42 min
Apr 24, 11:39 AM CDTSevere Thunderstorm WarningEAXAdair, Putnam51 min
Apr 24, 11:57 AM CDTSevere Thunderstorm WarningEAXGrundy, Sullivan48 min

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 0.5 hours before the alert went out and 158 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 12:00Z on 2002-04-24Temperature 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, Omaha, NE at 12:00Z on 2002-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.1939587897Sfc1 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
856 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 10:15 AM CDTSevere Thunderstorm WatchSPCDavis, Des Moines, Henry, Jefferson, Keokuk, Lee and 3 more5 hr
Apr 24, 2:30 PM CDTTornado WatchSPCBollinger, Butler, Callaway, Cape Girardeau, Carter, Crawford and 36 more6 hr
Apr 24, 5:30 PM CDTSevere Thunderstorm WatchSPCDunklin, Pemiscot5 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Missouri, 2002Severe Thunderstorm Watches in Nebraska, 2002Every severe thunderstorm watch in 2002

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.