Alert archive / Nebraska / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 121, NWS Omaha, NE

June 21, 2016Colfax County, Platte County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jun 21, 2016, 3:41 AM CDT for Colfax County, Platte County, Nebraska. It was in force for 34 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: Jun 21, 2016, 3:41 AM CDT (08:41 UTC)
Expired: Jun 21, 2016, 4:15 AM CDT
In force: 34 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Colfax County, NE, Platte County, NE

The radar

The Omaha radar (KOAX), 83 km from the middle of the area, began a volume at 08:41 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, 8.7 hours before the alert went out and 319 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: 1185 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 2073 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

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 Jun 20, 3:13 PM CDT, 12 hours 28 minutes earlier.

Area forecast discussion, Jun 20, 3:13 PM CDT, 12 hours 28 minutes before

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Hazardous weather outlook, Jun 20, 5:54 PM CDT, 9 hours 47 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
Jun 20, 7:00 PM CDT	Areal Flood Advisory	OAX	Dodge	3 hr
Jun 21, 1:44 AM CDT	Special Weather Statement	OAX	Colfax	31 min
Jun 21, 2:11 AM CDT	Special Weather Statement	OAX	Saunders	34 min
Jun 21, 2:42 AM CDT	Special Weather Statement	OAX	Douglas, Sarpy	33 min
Jun 21, 3:23 AM CDT	Special Weather Statement	OAX	Saunders	37 min
Jun 21, 3:33 AM CDT	Special Weather Statement	OAX	Colfax	27 min
Jun 21, 3:42 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy, Saunders	33 min
Jun 21, 4:17 AM CDT	Special Weather Statement	OAX	Butler	28 min
Jun 21, 4:25 AM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax	35 min
Jun 21, 4:40 AM CDT	Special Weather Statement	OAX	Cass	50 min
Jun 21, 4:10 AM CDT	Special Weather Statement	OAX	Page	35 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2016 Every severe thunderstorm warning in 2016

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.