Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 129, NWS Omaha, NE

June 23, 1996Mills County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jun 23, 1996, 5:06 PM CDT for Mills County, Pottawattamie County, Iowa. It was in force for 69 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 23, 1996, 5:06 PM CDT (22:06 UTC)
Expired: Jun 23, 1996, 6:15 PM CDT
In force: 69 min
Issued by: NWS Omaha, NE
Area: Whole counties

Counties Mills County, IA, Pottawattamie County, IA

The radar

The Omaha radar (KOAX), 67 km from the middle of the area, began a volume at 22:06 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 23, 5:11 PM CDT	Hail 2.75	Treynor, 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, 10.1 hours before the alert went out and 68 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: 70 J/kg
Mixed-layer CIN: -399 J/kg
Mixed-layer LCL: 1219 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

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, Jun 23, 11:24 AM CDT, 5 hours 42 minutes before

NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-241200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1120 AM CST SUN JUN 23 1996

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER GROUPS IN EASTERN NEBRASKA AND SOUTHWEST IOWA MAY NEED TO
BE ACTIVATED THIS AFTERNOON OR TONIGHT.

DISCUSSION...
A FRONTAL BOUNDARY EXTENDING FROM SOUTHERN NEBRASKA INTO NORTHWEST
KANSAS WILL SERVE AS A FOCUSSING MECHANISM FOR MORE SHOWERS AND
THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON INTO TONIGHT.
WARM...MOIST...AND VERY UNSTABLE AIR WILL CONTINUE TO FLOW NORTH OVER
THE FRONT THROUGH THIS AFTERNOON INTO TONIGHT.  THIS WILL SETUP THE
CONDITIONS FAVORABLE FOR SEVERE THUNDERSTORM DEVELOPMENT THIS AFTERNOON
THROUGH TONIGHT...MAINLY ACROSS SOUTHEAST NEBRASKA INTO SOUTHWEST IOWA.
IN ADDITION TO THE SEVERE WEATHER THREAT...HEAVY RAINFA<LL IN EXCESS OF
2 INCHES WILL BE POSSIBLE WITH THE STORMS.

HINSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 10:33 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Seward	27 min
Jun 22, 11:57 PM CDT	Severe Thunderstorm Warning	OAX	Butler	33 min
Jun 23, 12:39 AM CDT	Flash Flood Warning	OAX	Saunders	6 hr
Jun 23, 1:05 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy	40 min
Jun 23, 1:51 AM CDT	Flash Flood Warning	OAX	Washington	6 hr
Jun 23, 6:20 AM CDT	Flash Flood Warning	OAX	Saunders	4 hr
Jun 23, 3:23 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy	67 min
Jun 23, 3:32 PM CDT	Tornado Warning	OAX	Cass	58 min
Jun 23, 4:27 PM CDT	Tornado Warning	OAX	Cass	33 min
Jun 23, 1:38 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	37 min
Jun 23, 3:12 PM CDT	Severe Thunderstorm Warning	OAX	Page	48 min
Jun 23, 4:12 PM CDT	Tornado Warning	OAX	Fremont, Mills	48 min
Jun 23, 4:33 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Page	57 min
Jun 23, 6:55 PM CDT	Flash Flood Warning	OAX	Page	4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 1996 Every severe thunderstorm warning 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.