Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 2273

September 21, 20088 counties in Nebraska; Bennett County, Jackson County, Oglala Lakota County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2008, 4:51 PM MDT for 8 counties in Nebraska; Bennett County, Jackson County, Oglala Lakota County, South Dakota. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Sep 21, 2008, 4:51 PM MDT (22:51 UTC)
Expired: Sep 21, 2008, 6:15 PM MDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Sheridan County, NE, Bennett County, SD, Jackson County, SD, Oglala Lakota County, SD

The radar

The North Platte radar (KLNX), 122 km from the middle of the area, began a volume at 23:03 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

Rapid City, SD (KUNR), launched 12:00Z, 10.9 hours before the alert went out and 184 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: 12 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 1736 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -65 m²/s²
0-3 km storm-relative helicity: -82 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
Sep 21, 1:50 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in South Dakota, 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.