Alert archive / Nebraska / Mesoscale Discussions in 2006

Mesoscale Discussion 1685

July 31, 20064 states

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2006, 5:38 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 31, 2006, 5:38 PM CDT (22:38 UTC)
Expired: Jul 31, 2006, 8:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 49 counties

Rawlins County, KS, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Pipestone County, MN, Rock County, MN, Yellow Medicine County, MN, Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Frontier County, NE, Garfield County, NE, Gosper County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Perkins County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 110 km from the middle of the area, began a volume at 22:39 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.6 hours before the alert went out and 126 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: 279 J/kg
Mixed-layer CIN: -416 J/kg
Mixed-layer LCL: 1877 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jul 30, 8:57 PM CDT	Mesoscale Discussion	SPC	Kittson, Marshall	2 hr
Jul 30, 11:38 PM CDT	Severe Thunderstorm Watch	SPC	Beltrami, Kittson, Lake of the Woods, Marshall, Roseau	4 hr
Jul 31, 1:29 AM CDT	Mesoscale Discussion	SPC	Cook, Koochiching, Lake	91 min
Jul 31, 1:47 AM CDT	Severe Thunderstorm Watch	SPC	Cook, Itasca, Koochiching, Lake, Saint Louis	7 hr
Jul 31, 6:59 AM CDT	Mesoscale Discussion	SPC	Cook, Lake, Saint Louis	2 hr
Jul 31, 1:12 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 5 more	2 hr
Jul 31, 3:30 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 3 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2006 Mesoscale Discussions in South Dakota, 2006 Mesoscale Discussions in Minnesota, 2006 Every mesoscale discussion in 2006

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.