Alert archive / Iowa / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 129, NWS Des Moines, IA

August 5, 1989Washington County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 5, 1989, 10:50 AM CDT for Washington County, Iowa. It was in force for 43 min.

The area

The counties it named.

The facts

Issued
Aug 5, 1989, 10:50 AM CDT (15:50 UTC)
Expired
Aug 5, 1989, 11:33 AM CDT
In force
43 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Washington 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 12:00Z, 3.8 hours before the alert went out and 388 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 1989-08-05Temperature 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 1989-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.19395878Sfc1 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
3636 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
27 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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 5, 8:35 AM CDT, 2 hours 15 minutes before
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Special weather statement, Aug 5, 8:53 AM CDT, 1 hour 57 minutes before
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Special weather statement, Aug 5, 9:18 AM CDT, 1 hour 32 minutes before
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Special weather statement, Aug 5, 9:39 AM CDT, 1 hour 11 minutes before
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Special weather statement, Aug 5, 10:23 AM CDT, 27 minutes before
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Special weather statement, Aug 5, 10:32 AM CDT, 18 minutes before
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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 4, 8:27 PM CDTSevere Thunderstorm WarningDMXWinneshiek48 min
Aug 4, 8:39 PM CDTSevere Thunderstorm WarningDMXChickasaw51 min
Aug 4, 8:50 PM CDTTornado WarningDMXChickasaw25 min
Aug 4, 9:25 PM CDTSevere Thunderstorm WarningDMXFayette50 min
Aug 4, 10:06 PM CDTSevere Thunderstorm WarningDMXBremer54 min
Aug 4, 11:41 PM CDTSevere Thunderstorm WarningDMXBuchanan34 min
Aug 5, 7:04 AM CDTSevere Thunderstorm WarningDMXHumboldt41 min
Aug 5, 8:00 AM CDTSevere Thunderstorm WarningDMXCrawford45 min
Aug 5, 8:09 AM CDTSevere Thunderstorm WarningDMXCarroll51 min
Aug 5, 8:21 AM CDTSevere Thunderstorm WarningDMXGreene, Guthrie39 min
Aug 5, 8:41 AM CDTSevere Thunderstorm WarningDMXBoone, Dallas44 min
Aug 5, 8:55 AM CDTSevere Thunderstorm WarningDMXPolk, Story50 min
Aug 5, 8:55 AM CDTSevere Thunderstorm WarningDMXWarren50 min
Aug 5, 9:20 AM CDTSevere Thunderstorm WarningDMXJasper, Marion40 min
Aug 5, 9:20 AM CDTSevere Thunderstorm WarningDMXMarshall40 min
Aug 5, 9:54 AM CDTSevere Thunderstorm WarningDMXPoweshiek, Tama54 min
Aug 5, 9:54 AM CDTSevere Thunderstorm WarningDMXJasper, Marshall33 min
Aug 5, 10:22 AM CDTSevere Thunderstorm WarningDMXBenton, Iowa68 min
Aug 5, 10:50 AM CDTSevere Thunderstorm WarningDMXKeokuk55 min
Aug 5, 10:50 AM CDTSevere Thunderstorm WarningDMXJohnson, Linn43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1989Every severe thunderstorm warning 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.