Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 1249

August 6, 20185 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2018, 2:49 PM MDT for 5 counties in Nebraska. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Aug 6, 2018, 2:49 PM MDT (20:49 UTC)
Expired: Aug 6, 2018, 4:15 PM MDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Box Butte County, NE, Cherry County, NE, Dawes County, NE, Sheridan County, NE, Sioux County, NE

The radar

The North Platte radar (KLNX), 171 km from the middle of the area, began a volume at 20:51 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

Rapid City, SD (KRAP), launched 12:00Z, 8.8 hours before the alert went out and 174 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1536 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 6:05 PM MDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Scotts Bluff, Sioux	115 min
Aug 5, 7:16 PM MDT	Mesoscale Discussion	SPC	Harlan	119 min
Aug 5, 8:32 PM MDT	Mesoscale Discussion	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 17 more	2 hr
Aug 6, 1:31 PM MDT	Mesoscale Discussion	SPC	Boone, Buffalo, Burt, Butler, Cass, Colfax and 26 more	89 min
Aug 6, 2:02 PM MDT	Mesoscale Discussion	SPC	Banner, Kimball	88 min
Aug 6, 2:37 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Cheyenne, Kimball, Morrill, Scotts Bluff	7 hr
Aug 6, 5:24 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Kimball, Morrill, Scotts Bluff and 1 more	66 min
Aug 6, 5:38 PM MDT	Mesoscale Discussion	SPC	Johnson, Nemaha, Otoe, Pawnee, Richardson	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2018 Every mesoscale discussion in 2018

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.