Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 360

March 28, 200712 counties in Nebraska; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2007, 1:04 PM MDT for 12 counties in Nebraska; 5 counties in South Dakota. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Mar 28, 2007, 1:04 PM MDT (19:04 UTC)
Expired: Mar 28, 2007, 3:00 PM MDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Oglala Lakota County, SD, Pennington County, SD

The radar

The North Platte radar (KLNX), 176 km from the middle of the area, began a volume at 19:10 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.

Tornado Watch 81Mar 28, 1:35 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.1 hours before the alert went out and 207 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: 620 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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
Mar 28, 1:33 PM MDT	Tornado Watch	SPC	Box Butte, Cheyenne, Dawes, Morrill	7 hr
Mar 28, 2:29 PM MDT	Mesoscale Discussion	SPC	Dundy, Furnas, Gosper, Harlan, Hitchcock, Red Willow	91 min
Mar 28, 2:59 PM MDT	Tornado Watch	SPC	Dundy, Hitchcock, Red Willow	8 hr
Mar 28, 5:10 PM MDT	Mesoscale Discussion	SPC	Arthur, Chase, Cherry, Deuel, Dundy, Frontier and 15 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in South Dakota, 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.