Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1526

August 8, 201417 counties in Nebraska; Charles Mix County, Gregory County, Tripp County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2014, 4:29 PM MDT for 17 counties in Nebraska; Charles Mix County, Gregory County, Tripp County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 8, 2014, 4:29 PM MDT (22:29 UTC)
Expired: Aug 8, 2014, 6:30 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Charles Mix County, SD, Gregory County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 45 km from the middle of the area, began a volume at 22:29 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 456Aug 8, 6:50 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.5 hours before the alert went out and 137 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: 291 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Aug 7, 6:12 PM MDT	Mesoscale Discussion	SPC	Dundy, Hitchcock	93 min
Aug 8, 1:41 PM MDT	Mesoscale Discussion	SPC	Adams, Blaine, Brown, Buffalo, Cherry, Custer and 17 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in South Dakota, 2014 Every mesoscale discussion in 2014

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.