Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 831

May 27, 20139 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 27, 2013, 8:39 PM CDT for 9 counties in Nebraska. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 27, 2013, 8:39 PM CDT (01:39 UTC)
Expired: May 27, 2013, 10:15 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Blaine County, NE, Brown County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 48 km from the middle of the area, began a volume at 01:39 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, 1.7 hours before the alert went out and 51 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: 1140 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1482 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 27, 8:18 PM CDT	Mesoscale Discussion	SPC	Clay, Fillmore, Gage, Jefferson, Johnson, Lancaster and 6 more	117 min
May 27, 9:07 PM CDT	Mesoscale Discussion	SPC	Cass, Fillmore, Gage, Jefferson, Johnson, Lancaster and 6 more	53 min
May 27, 10:23 PM CDT	Mesoscale Discussion	SPC	Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 3 more	67 min
May 27, 11:19 PM CDT	Mesoscale Discussion	SPC	Richardson	116 min
May 28, 1:37 PM CDT	Mesoscale Discussion	SPC	Cass, Gage, Jefferson, Johnson, Nemaha, Otoe and 2 more	113 min
May 28, 2:23 PM CDT	Tornado Watch	SPC	Gage, Jefferson, Johnson, Nemaha, Otoe, Pawnee and 1 more	8 hr
May 28, 3:08 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 13 more	2 hr
May 28, 3:51 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 11 more	9 hr
May 28, 5:52 PM CDT	Mesoscale Discussion	SPC	Nemaha, Pawnee, Richardson	83 min
May 28, 6:05 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 11 more	115 min

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.