Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1562

August 17, 201410 counties in Nebraska; 8 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2014, 1:56 PM CDT for 10 counties in Nebraska; 8 counties in South Dakota. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Aug 17, 2014, 1:56 PM CDT (18:56 UTC)
Expired: Aug 17, 2014, 3:00 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Blaine County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Grant County, NE, Hooker County, NE, Keya Paha County, NE, Logan County, NE, McPherson County, NE, Thomas County, NE, Bennett County, SD, Custer County, SD, Jackson County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD

The radar

The Rapid City radar (KUDX), 137 km from the middle of the area, began a volume at 18:57 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 462Aug 17, 2:25 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.9 hours before the alert went out and 247 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: 1077 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 1612 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 69 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
Aug 17, 2:21 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Blaine, Brown, Buffalo, Cherry, Clay and 34 more	8 hr
Aug 17, 5:09 PM CDT	Mesoscale Discussion	SPC	Adams, Blaine, Boone, Brown, Buffalo, Cherry and 23 more	96 min
Aug 17, 6:43 PM CDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Boone, Buffalo, Butler and 28 more	62 min
Aug 17, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	Campbell, Corson, Walworth	6 hr
Aug 17, 6:39 PM CDT	Mesoscale Discussion	SPC	Campbell, Corson	66 min

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.