Alert archive / Nebraska / Mesoscale Discussions in 2009

Mesoscale Discussion 2103

October 9, 20098 counties in Colorado; 12 counties in Nebraska; Laramie County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2009, 10:20 PM MDT for 8 counties in Colorado; 12 counties in Nebraska; Laramie County, Wyoming. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Oct 9, 2009, 10:20 PM MDT (04:20 UTC)
Expired: Oct 10, 2009, 2:15 AM MDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 21 counties

Adams County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Hayes County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Perkins County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 159 km from the middle of the area, began a volume at 04:21 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 00:00Z, 4.3 hours before the alert went out and 205 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: 4 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 127 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
Oct 10, 4:56 AM MDT	Mesoscale Discussion	SPC	Adams, Buffalo, Butler, Cass, Clay, Dawson and 34 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2009 Mesoscale Discussions in Colorado, 2009 Mesoscale Discussions in Wyoming, 2009 Every mesoscale discussion in 2009

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.