Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 724

May 15, 201715 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 15, 2017, 7:41 PM CDT for 15 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 15, 2017, 7:41 PM CDT (00:41 UTC)
Expired: May 15, 2017, 10:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Burt County, NE, Butler County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 87 km from the middle of the area, began a volume at 00:44 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

Omaha, NE (KOAX), launched 00:00Z, 0.7 hours before the alert went out and 87 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: 1237 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 2394 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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
May 15, 7:34 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sheridan and 1 more	56 min
May 15, 10:53 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sheridan and 1 more	67 min
May 15, 11:54 PM CDT	Severe Thunderstorm Watch	SPC	Dakota, Dixon	3 hr
May 16, 2:16 PM CDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Scotts Bluff, Sioux	119 min
May 16, 3:58 PM CDT	Mesoscale Discussion	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 33 more	2 hr
May 16, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 33 more	7 hr
May 16, 5:47 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Box Butte, Brown, Chase, Cherry and 21 more	88 min

Nearby

Mesoscale Discussions in Nebraska, 2017 Every mesoscale discussion in 2017

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.