Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 412

April 2, 200718 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2007, 10:06 PM CDT for 18 counties in Nebraska. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 2, 2007, 10:06 PM CDT (03:06 UTC)
Expired: Apr 2, 2007, 11:00 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Boone County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, York County, NE

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 03:08 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 107Apr 3, 12:05 AM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.1 hours before the alert went out and 78 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: 74 J/kg
Mixed-layer CIN: -377 J/kg
Mixed-layer LCL: 1481 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 516 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 2, 7:52 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Buffalo, Butler, Cass, Clay and 38 more	83 min
Apr 2, 8:05 PM CDT	Mesoscale Discussion	SPC	Douglas	115 min
Apr 2, 8:25 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Boone, Buffalo, Burt, Butler and 32 more	6 hr
Apr 2, 11:40 PM CDT	Mesoscale Discussion	SPC	Cass, Johnson, Nemaha, Otoe, Pawnee, Richardson	65 min
Apr 3, 12:03 AM CDT	Severe Thunderstorm Watch	SPC	Cass, Douglas, Johnson, Nemaha, Otoe, Pawnee and 2 more	7 hr
Apr 3, 2:22 AM CDT	Mesoscale Discussion	SPC	Cass, Douglas, Johnson, Nemaha, Otoe, Pawnee and 2 more	53 min

Nearby

Mesoscale Discussions in Nebraska, 2007 Every mesoscale discussion in 2007

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.