Alert archive / Iowa / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 33, NWS Des Moines, IA

April 27, 1989Jefferson County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 27, 1989, 7:53 AM CDT for Jefferson County, Iowa. It was in force for 36 min.

The area

The counties it named.

The facts

Issued: Apr 27, 1989, 7:53 AM CDT (12:53 UTC)
Expired: Apr 27, 1989, 8:29 AM CDT
In force: 36 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Jefferson 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

Peoria Regional, IL (KPIA), launched 12:00Z, 0.9 hours before the alert went out and 202 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 7 J/kg
Mixed-layer CIN: -552 J/kg
Mixed-layer LCL: 1747 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 59 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, Apr 27, 3:38 AM CDT, 4 hours 15 minutes before

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Special weather statement, Apr 27, 3:39 AM CDT, 4 hours 14 minutes before

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Special weather statement, Apr 27, 4:06 AM CDT, 3 hours 47 minutes before

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Special weather statement, Apr 27, 4:40 AM CDT, 3 hours 13 minutes before

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Special weather statement, Apr 27, 7:38 AM CDT, 15 minutes before

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Special weather statement, Apr 27, 7:46 AM CDT, 7 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 7:17 PM CDT	Severe Thunderstorm Warning	DMX	Van Buren	28 min
Apr 26, 7:28 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk, Warren	62 min
Apr 27, 7:53 AM CDT	Severe Thunderstorm Warning	DMX	Wapello	52 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1989 Every 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.