Alert archive / Nebraska / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 162, NWS Omaha, NE

July 9, 2009Burt County, Cuming County, Thurston County, Nebraska; Monona County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 9, 2009, 8:47 AM CDT for Burt County, Cuming County, Thurston County, Nebraska; Monona County, Iowa. It was in force for 58 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: Jul 9, 2009, 8:47 AM CDT (13:47 UTC)
Expired: Jul 9, 2009, 9:45 AM CDT
In force: 58 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon

Counties Monona County, IA, Burt County, NE, Cuming County, NE, Thurston County, NE

The radar

The Omaha radar (KOAX), 75 km from the middle of the area, began a volume at 13:47 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 9, 3:41 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 1.8 hours before the alert went out and 75 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: 709 J/kg
Mixed-layer CIN: -249 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Jul 9, 3:25 AM CDT, 5 hours 22 minutes earlier.

Area forecast discussion, Jul 9, 3:25 AM CDT, 5 hours 22 minutes before

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Hazardous weather outlook, Jul 9, 5:38 AM CDT, 3 hours 9 minutes before

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In the hours before

Local storm report, Jul 9, 7:27 AM CDT, 1 hour 20 minutes before

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Local storm report, Jul 9, 7:44 AM CDT, 1 hour 3 minutes before

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Local storm report, Jul 9, 7:56 AM CDT, 51 minutes before

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Local storm report, Jul 9, 8:14 AM CDT, 33 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
Jul 9, 6:43 AM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	62 min
Jul 9, 7:42 AM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	63 min
Jul 9, 9:24 AM CDT	Areal Flood Advisory	OAX	Cedar	3 hr
Jul 9, 9:41 AM CDT	Severe Thunderstorm Warning	OAX	Burt	49 min
Jul 9, 2:11 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	34 min
Jul 9, 3:17 PM CDT	Flash Flood Watch	OAX	Cedar, Knox, Thurston	13 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2009 Severe Thunderstorm Warnings in Iowa, 2009 Every severe thunderstorm warning in 2009

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.