Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 72, NWS Omaha, NE

May 7, 2015Cass County, Otoe County, Nebraska; Fremont County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 7, 2015, 7:04 PM CDT for Cass County, Otoe County, Nebraska; Fremont County, Iowa. It was in force for 26 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: May 7, 2015, 7:04 PM CDT (00:04 UTC)
Expired: May 7, 2015, 7:30 PM CDT
In force: 26 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Fremont County, IA, Cass County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 70 km from the middle of the area, began a volume at 00:05 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 00:00Z, 0.1 hours before the alert went out and 199 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1368 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 7, 6:22 PM CDT, 42 minutes earlier.

Area forecast discussion, May 7, 6:22 PM CDT, 42 minutes before

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Hazardous weather outlook, May 7, 4:55 PM CDT, 2 hours 9 minutes before

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In the hours before

Special weather statement, May 7, 4:27 PM CDT, 2 hours 37 minutes before

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Special weather statement, May 7, 4:37 PM CDT, 2 hours 27 minutes before

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Local storm report, May 7, 4:53 PM CDT, 2 hours 11 minutes before

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Special weather statement, May 7, 5:35 PM CDT, 1 hour 29 minutes before

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Local storm report, May 7, 6:39 PM CDT, 25 minutes before

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Special weather statement, May 7, 6:59 PM CDT, 5 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
May 7, 7:11 PM CDT	River Flood Warning	OAX	Seward	18 hr
May 7, 7:30 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	30 min
May 7, 7:16 PM CDT	Areal Flood Warning	OAX	Mills, Montgomery	6 hr
May 7, 7:33 PM CDT	Special Weather Statement	OAX	Montgomery	57 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015 Severe Thunderstorm Warnings in Iowa, 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.