Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 201, NWS Omaha, NE

August 27, 2015Cass County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Aug 27, 2015, 7:56 AM CDT for Cass County, Nebraska. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 27, 2015, 7:56 AM CDT (12:56 UTC)
Expired: Aug 27, 2015, 8:12 AM CDT
In force: 16 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Cass County, NE

The radar

The Omaha radar (KOAX), 49 km from the middle of the area, began a volume at 12:55 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.

The nearest sounding before it

Topeka, KS (KFOE), launched 12:00Z, 0.9 hours before the alert went out and 217 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: 30 J/kg
Mixed-layer CIN: -533 J/kg
Mixed-layer LCL: 1175 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.9

Open this sounding in Storm Lab

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.

NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 27, 6:26 AM CDT, 1 hour 30 minutes earlier.

Area forecast discussion, Aug 27, 6:26 AM CDT, 1 hour 30 minutes before

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Hazardous weather outlook, Aug 27, 4:21 AM CDT, 3 hours 35 minutes before

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In the hours before

Special weather statement, Aug 27, 6:58 AM CDT, 58 minutes before

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Special weather statement, Aug 27, 7:05 AM CDT, 51 minutes before

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Special weather statement, Aug 27, 7:12 AM CDT, 44 minutes before

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Special weather statement, Aug 27, 7:18 AM CDT, 38 minutes before

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Local storm report, Aug 27, 7:31 AM CDT, 25 minutes before

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Special weather statement, Aug 27, 7:35 AM CDT, 21 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
Aug 27, 5:50 AM CDT	Special Weather Statement	OAX	Dodge	40 min
Aug 27, 6:19 AM CDT	Special Weather Statement	OAX	Saunders	41 min
Aug 27, 6:33 AM CDT	Special Weather Statement	OAX	Saunders	42 min
Aug 27, 6:58 AM CDT	Special Weather Statement	OAX	Thurston	32 min
Aug 27, 7:05 AM CDT	Special Weather Statement	OAX	Saunders	25 min
Aug 27, 7:18 AM CDT	Special Weather Statement	OAX	Douglas, Sarpy	27 min
Aug 27, 7:35 AM CDT	Special Weather Statement	OAX	Cass	25 min
Aug 27, 8:11 AM CDT	Special Weather Statement	OAX	Otoe	34 min
Aug 27, 7:12 AM CDT	Special Weather Statement	OAX	Monona	33 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015 Every severe thunderstorm warning in 2015

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; radar from the NEXRAD Level II archive.