Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 972

May 22, 200815 counties in Nebraska; Goshen County, Platte County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 22, 2008, 1:29 PM MDT for 15 counties in Nebraska; Goshen County, Platte County, Wyoming. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: May 22, 2008, 1:29 PM MDT (19:29 UTC)
Expired: May 22, 2008, 2:30 PM MDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Keith County, NE, Lincoln County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 171 km from the middle of the area, began a volume at 19:30 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.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.5 hours before the alert went out and 179 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: 392 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1287 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: -103 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.2

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 21, 7:40 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more	65 min
May 21, 9:35 PM MDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Morrill, Scotts Bluff	25 min
May 22, 2:38 AM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Brown, Buffalo and 47 more	97 min
May 22, 11:25 AM MDT	Tornado Watch	SPC	Cheyenne, Kimball	9 hr
May 22, 12:52 PM MDT	Tornado Watch PDS	SPC	Buffalo, Dawson, Dundy, Franklin, Furnas, Gosper and 5 more	10 hr
May 22, 2:13 PM MDT	Tornado Watch	SPC	Chase, Deuel, Frontier, Hayes, Keith, Lincoln and 1 more	7 hr
May 22, 2:22 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Blaine, Box Butte, Brown, Cherry and 15 more	7 hr
May 22, 3:02 PM MDT	Mesoscale Discussion	SPC	Dundy, Furnas, Harlan, Hitchcock, Red Willow	58 min
May 22, 5:46 PM MDT	Mesoscale Discussion	SPC	Buffalo, Chase, Dawson, Dundy, Franklin, Frontier and 11 more	59 min

Nearby

Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in Wyoming, 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.