Alert archive / Iowa / Tornado Watches in 1997

Tornado Watch 580

July 7, 19974 states

The Storm Prediction Center issued this tornado watch at Jul 7, 1997, 4:00 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 7, 1997, 4:00 PM CDT (21:00 UTC)
Expired
Jul 7, 1997, 10:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 60 counties

Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Sioux County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Cottonwood 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, Watonwan County, MN, Cedar County, NE, Dakota County, NE, Dixon County, NE, Pierce County, NE, Thurston County, NE, Wayne County, NE, Clay County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 79 km from the middle of the area, began a volume at 21:01 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

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

IssuedProductOfficeCountiesLasted
Jul 7, 4:02 PM CDTSevere Thunderstorm WarningFSDTurner33 min
Jul 7, 4:14 PM CDTSevere Thunderstorm WarningFSDLincoln, Minnehaha46 min
Jul 7, 4:17 PM CDTSevere Thunderstorm WarningOAXCedar63 min
Jul 7, 4:41 PM CDTTornado WarningFSDLincoln, Minnehaha29 min
Jul 7, 4:56 PM CDTSevere Thunderstorm WarningFSDClay, Union34 min
Jul 7, 5:01 PM CDTTornado WarningFSDLyon, Sioux44 min
Jul 7, 5:05 PM CDTSevere Thunderstorm WarningFSDLincoln30 min
Jul 7, 5:06 PM CDTTornado WarningOAXPierce49 min
Jul 7, 5:08 PM CDTTornado WarningFSDUnion32 min
Jul 7, 5:16 PM CDTTornado WarningFSDLincoln34 min
Jul 7, 5:20 PM CDTSevere Thunderstorm WarningOAXCedar50 min
Jul 7, 5:34 PM CDTSevere Thunderstorm WarningFSDNobles, Rock31 min
Jul 7, 5:40 PM CDTSevere Thunderstorm WarningFSDPlymouth30 min
Jul 7, 5:48 PM CDTSevere Thunderstorm WarningFSDNobles32 min
Jul 7, 5:58 PM CDTSevere Thunderstorm WarningOAXWayne62 min
Jul 7, 6:03 PM CDTSevere Thunderstorm WarningOAXPierce47 min
Jul 7, 6:15 PM CDTSevere Thunderstorm WarningFSDPlymouth30 min
Jul 7, 6:47 PM CDTSevere Thunderstorm WarningFSDPlymouth33 min
Jul 7, 6:47 PM CDTTornado WarningFSDPlymouth33 min
Jul 7, 7:16 PM CDTSevere Thunderstorm WarningFSDClay, O'Brien49 min
Jul 7, 7:46 PM CDTSevere Thunderstorm WarningFSDClay34 min
Jul 7, 8:05 PM CDTSevere Thunderstorm WarningFSDWoodbury30 min
Jul 7, 8:07 PM CDTSevere Thunderstorm WarningOAXMonona63 min
Jul 7, 8:15 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida30 min
Jul 7, 9:27 PM CDTSevere Thunderstorm WarningDMXCalhoun, Sac33 min

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.0 hours before the alert went out and 220 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 1997-07-07Temperature 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 1997-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 square meters per square second.1939Sfc1 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
929 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 7, 5:45 PM CDTTornado WatchSPCAdair, Adams, Audubon, Cass, Dallas, Fremont and 9 more6 hr
Jul 6, 10:45 PM CDTSevere Thunderstorm WatchSPCBennett, Butte, Custer, Fall River, Haakon, Harding and 7 more6 hr

Nearby

Tornado Watches in Iowa, 1997Tornado Watches in Minnesota, 1997Tornado Watches in South Dakota, 1997Every tornado watch in 1997

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.