Alert archive / Nebraska / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 22, NWS Cheyenne, WY

May 11, 1991Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 11, 1991, 8:28 PM MDT for Dawes County, Nebraska. It was in force for 62 min.

The area

The counties it named.

The facts

Issued: May 11, 1991, 8:28 PM MDT (02:28 UTC)
Expired: May 11, 1991, 9:30 PM MDT
In force: 62 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Dawes County, NE

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 2.5 hours before the alert went out and 317 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: 221 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 3603 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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, May 11, 3:03 PM MDT, 5 hours 25 minutes before

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Special weather statement, May 11, 4:45 PM MDT, 3 hours 43 minutes before

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Special weather statement, May 11, 5:38 PM MDT, 2 hours 50 minutes before

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Special weather statement, May 11, 6:50 PM MDT, 1 hour 38 minutes before

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        Please try again in a few minutes.
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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 11, 6:03 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	40 min
May 11, 7:02 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	40 min
May 11, 8:02 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	28 min
May 11, 8:50 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	25 min
May 11, 8:34 PM MDT	Severe Thunderstorm Warning	CYS	Platte	56 min
May 12, 10:02 AM MDT	Tornado Warning	CYS	Big Horn	28 min
May 12, 11:55 AM MDT	Severe Thunderstorm Warning	CYS	Sheridan	35 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1991 Every severe thunderstorm warning in 1991

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.