Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 1801

July 17, 200823 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2008, 12:04 PM CDT for 23 counties in Nebraska. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2008, 12:04 PM CDT (17:04 UTC)
Expired: Jul 17, 2008, 2:00 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 23 counties

Antelope County, NE, Boone County, NE, Buffalo County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Greeley County, NE, Howard County, NE, Lincoln County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE

The radar

The Omaha radar (KOAX), 146 km from the middle of the area, began a volume at 17:05 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

Omaha, NE (KOAX), launched 12:00Z, 5.1 hours before the alert went out and 146 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: 1745 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 16, 7:50 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Boyd, Brown, Cherry, Grant and 8 more	5 hr
Jul 16, 11:54 PM CDT	Mesoscale Discussion	SPC	Keya Paha	96 min
Jul 17, 5:50 PM CDT	Mesoscale Discussion	SPC	Dakota, Thurston	85 min
Jul 17, 6:26 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Buffalo, Burt, Butler, Cass and 48 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Every mesoscale discussion in 2008

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.