Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 844

May 9, 20085 states

The Storm Prediction Center issued this mesoscale discussion at May 9, 2008, 5:02 PM MDT for 5 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: May 9, 2008, 5:02 PM MDT (23:02 UTC)
Expired: May 9, 2008, 7:00 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center

All 46 counties

Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Gove County, KS, Logan County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Oglala Lakota County, SD, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 167 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

Denver, CO (KDNR), launched 12:00Z, 11.0 hours before the alert went out and 185 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1264 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 181 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
May 9, 12:00 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Logan, Phillips, Sedgwick, Washington, Yuma	3 hr
May 9, 1:18 PM MDT	Severe Thunderstorm Watch	SPC	Kit Carson, Logan, Phillips, Sedgwick, Washington, Yuma	6 hr
May 9, 2:47 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Logan, Phillips, Sedgwick, Washington, Yuma	118 min
May 8, 6:19 PM MDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Comanche, Edwards, Ellis and 25 more	56 min
May 8, 7:08 PM MDT	Severe Thunderstorm Watch	SPC	Barber, Butler, Chautauqua, Clark, Comanche, Cowley and 18 more	6 hr
May 8, 11:33 PM MDT	Mesoscale Discussion	SPC	Allen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 8 more	87 min
May 9, 12:21 AM MDT	Severe Thunderstorm Watch	SPC	Cherokee, Crawford	3 hr
May 9, 12:30 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	6 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.