Alert archive / Iowa / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 59, NWS Omaha, NE

May 19, 2013Burt County, Nebraska; Harrison County, Monona County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 19, 2013, 9:00 PM CDT for Burt County, Nebraska; Harrison County, Monona County, Iowa. It was in force for 30 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 19, 2013, 9:00 PM CDT (02:00 UTC)
Expired: May 19, 2013, 9:30 PM CDT
In force: 30 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Harrison County, IA, Monona County, IA, Burt County, NE

The radar

The Omaha radar (KOAX), 66 km from the middle of the area, began a volume at 02:03 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
May 19, 4:50 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 19, 2:59 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 66 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: 588 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1386 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.4

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 19, 6:44 PM CDT, 2 hours 16 minutes earlier.

Area forecast discussion, May 19, 6:44 PM CDT, 2 hours 16 minutes before

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Hazardous weather outlook, May 19, 4:59 PM CDT, 4 hours 1 minute before

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In the hours before

Local storm report, May 19, 5:37 PM CDT, 3 hours 23 minutes before

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Special weather statement, May 19, 6:01 PM CDT, 2 hours 59 minutes before

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Local storm report, May 19, 6:10 PM CDT, 2 hours 50 minutes before

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Local storm report, May 19, 6:31 PM CDT, 2 hours 29 minutes before

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Local storm report, May 19, 6:49 PM CDT, 2 hours 11 minutes before

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Special weather statement, May 19, 6:53 PM CDT, 2 hours 7 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 19, 7:12 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Madison, Platte, Stanton	33 min
May 19, 7:38 PM CDT	Special Weather Statement	OAX	Cedar, Colfax, Pierce, Stanton, Wayne	22 min
May 19, 8:00 PM CDT	Special Weather Statement	OAX	Butler, Colfax	30 min
May 19, 8:21 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline, Seward	39 min
May 19, 8:39 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	36 min
May 19, 8:40 PM CDT	Special Weather Statement	OAX	Burt, Cuming, Dodge, Saunders, Thurston, Washington	50 min
May 19, 7:11 PM CDT	Special Weather Statement	OAX	Page	19 min
May 20, 5:08 PM CDT	Special Weather Statement	OAX	Monona	22 min
May 20, 6:49 PM CDT	Special Weather Statement	OAX	Shelby	26 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2013 Severe Thunderstorm Warnings in Nebraska, 2013 Every severe thunderstorm warning in 2013

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.