Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 2157

September 7, 2005Logan County, Phillips County, Sedgwick County, Colorado; 11 counties in Nebraska; Fall River County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2005, 2:03 PM MDT for Logan County, Phillips County, Sedgwick County, Colorado; 11 counties in Nebraska; Fall River County, South Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Sep 7, 2005, 2:03 PM MDT (20:03 UTC)
Expired: Sep 7, 2005, 3:30 PM MDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Logan County, CO, Phillips County, CO, Sedgwick County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Fall River County, SD

The radar

The Cheyenne radar (KCYS), 154 km from the middle of the area, began a volume at 20:03 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

Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 213 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: 54 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 1634 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 27 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 7, 5:01 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kiowa, Kit Carson, Prowers, Washington, Yuma	119 min
Sep 6, 10:26 PM MDT	Mesoscale Discussion	SPC	Boyd, Keya Paha	3 hr
Sep 7, 5:40 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Colorado, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.