Alert archive / Iowa / Tornado Warnings in 1996

Tornado Warning 26, NWS Omaha, NE

June 20, 1996Monona County, Iowa

NWS Omaha, NE issued this tornado warning at Jun 20, 1996, 5:11 PM CDT for Monona County, Iowa. It was in force for 19 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 20, 1996, 5:11 PM CDT (22:11 UTC)
Expired: Jun 20, 1996, 5:30 PM CDT
In force: 19 min
Issued by: NWS Omaha, NE
Area: Whole counties

County Monona County, IA

The radar

The Omaha radar (KOAX), 88 km from the middle of the area, began a volume at 22:12 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.

What was reported inside it

Time	Report	Where	Remark
Jun 20, 5:25 PM CDT	Hail 1.75	Mapleton, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.2 hours before the alert went out and 88 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: 2885 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.7

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 tornado 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, Jun 20, 11:51 AM CDT, 5 hours 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 7:27 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	33 min
Jun 20, 7:00 AM CDT	Severe Thunderstorm Warning	OAX	Madison, Stanton	30 min
Jun 20, 7:43 AM CDT	Severe Thunderstorm Warning	OAX	Colfax, Dodge	62 min
Jun 20, 8:14 AM CDT	Severe Thunderstorm Warning	OAX	Douglas	61 min
Jun 20, 8:14 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Washington	61 min
Jun 20, 2:00 PM CDT	Severe Thunderstorm Warning	OAX	Wayne	45 min
Jun 20, 5:51 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Stanton	54 min
Jun 20, 6:27 PM CDT	Tornado Warning	OAX	Cuming, Stanton	33 min
Jun 20, 6:34 PM CDT	Tornado Warning	OAX	Burt	41 min
Jun 20, 6:39 PM CDT	Tornado Warning	OAX	Colfax, Dodge	51 min
Jun 20, 12:32 AM CDT	Severe Thunderstorm Warning	OAX	Monona	43 min
Jun 20, 1:15 AM CDT	Severe Thunderstorm Warning	OAX	Monona	30 min
Jun 20, 1:45 AM CDT	Severe Thunderstorm Warning	OAX	Shelby	45 min
Jun 20, 8:03 AM CDT	Severe Thunderstorm Warning	OAX	Harrison	42 min
Jun 20, 9:00 AM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie, Shelby	30 min
Jun 20, 3:43 PM CDT	Severe Thunderstorm Warning	OAX	Monona	47 min
Jun 20, 6:59 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	61 min

Nearby

Tornado Warnings in Iowa, 1996 Every tornado warning in 1996 Tornadoes in 1996

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.