Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 1174

June 22, 201321 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2013, 3:34 PM CDT for 21 counties in Nebraska. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2013, 3:34 PM CDT (20:34 UTC)
Expired: Jun 22, 2013, 4:30 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 21 counties

Adams County, NE, Blaine County, NE, Brown County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Howard County, NE, Kearney County, NE, Logan County, NE, Loup County, NE, Phelps County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 111 km from the middle of the area, began a volume at 20:33 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.

Tornado Watch 347Jun 22, 5:55 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.6 hours before the alert went out and 106 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: 407 J/kg
Mixed-layer CIN: -635 J/kg
Mixed-layer LCL: 1409 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

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
Jun 21, 8:56 PM CDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Cherry, Holt, Hooker and 7 more	94 min
Jun 21, 9:07 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boone, Boyd, Cedar, Custer and 9 more	5 hr
Jun 21, 9:39 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	36 min
Jun 21, 10:25 PM CDT	Severe Thunderstorm Watch	SPC	Buffalo, Dawson, Gosper, Greeley, Hall, Hamilton and 7 more	3 hr
Jun 22, 12:42 AM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Brown, Cherry, Custer, Grant and 7 more	93 min
Jun 22, 2:45 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Garden, Morrill, Scotts Bluff and 2 more	90 min
Jun 22, 3:13 PM CDT	Tornado Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	6 hr
Jun 22, 5:00 PM CDT	Mesoscale Discussion	SPC	Chase, Cheyenne, Custer, Dawson, Deuel, Dundy and 7 more	90 min
Jun 22, 5:18 PM CDT	Tornado Watch	SPC	Dundy	7 hr
Jun 22, 5:56 PM CDT	Tornado Watch	SPC	Adams, Antelope, Arthur, Blaine, Boone, Buffalo and 52 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2013 Every mesoscale discussion in 2013

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.