Alert archive / Iowa / Tornado Warnings in 1989

Tornado Warning 10, NWS Omaha, NE

September 7, 1989Shelby County, Iowa

NWS Omaha, NE issued this tornado warning at Sep 7, 1989, 10:26 PM CDT for Shelby County, Iowa. It was in force for 34 min.

The area

The counties it named.

The facts

Issued
Sep 7, 1989, 10:26 PM CDT (03:26 UTC)
Expired
Sep 7, 1989, 11:00 PM CDT
In force
34 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Shelby County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.4 hours before the alert went out and 97 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 1989-09-08Temperature 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 00:00Z on 1989-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3627 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
221 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 7, 11:31 PM CDTSevere Thunderstorm WarningOAXCass, Sarpy44 min
Sep 8, 12:18 PM CDTFlash Flood WarningOAXLancaster3 hr
Sep 8, 5:27 PM CDTFlash Flood WarningOAXLancaster3 hr
Sep 7, 9:29 PM CDTSevere Thunderstorm WarningOAXShelby46 min
Sep 7, 11:55 PM CDTFlash Flood WarningOAXShelby3 hr
Sep 8, 3:08 AM CDTFlash Flood WarningOAXShelby2 hr

Nearby

Tornado Warnings in Iowa, 1989Every tornado warning in 1989Tornadoes in 1989

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.