Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 2229

September 7, 20084 counties in Colorado; 18 counties in Kansas; 24 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2008, 8:12 PM MDT for 4 counties in Colorado; 18 counties in Kansas; 24 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 7, 2008, 8:12 PM MDT (02:12 UTC)
Expired: Sep 7, 2008, 10:45 PM MDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 46 counties

Morgan County, CO, Phillips County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Clay County, KS, Cloud County, KS, Decatur County, KS, Graham County, KS, Jewell County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rawlins County, KS, Republic County, KS, Rooks County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Washington County, KS, Adams County, NE, Buffalo County, NE, Chase County, NE, Clay County, NE, Dawson County, NE, Dundy County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Jefferson County, NE, Kearney County, NE, Nuckolls County, NE, Phelps County, NE, Red Willow County, NE, Saline County, NE, Thayer County, NE, Webster County, NE

The radar

The Goodland radar (KGLD), 128 km from the middle of the area, began a volume at 02:15 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 891Sep 7, 8:50 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.2 hours before the alert went out and 244 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: 236 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 2370 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 251 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
Sep 7, 8:49 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Cheyenne, Elbert, Kit Carson, Lincoln and 7 more	7 hr
Sep 7, 10:44 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Cheyenne, Elbert, Kiowa, Kit Carson and 7 more	91 min
Sep 8, 4:17 AM MDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Cloud, Doniphan, Jackson and 11 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in Kansas, 2008 Mesoscale Discussions in Colorado, 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.