Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 1167

June 27, 20177 counties in Iowa; Atchison County, Missouri; 10 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2017, 11:33 PM CDT for 7 counties in Iowa; Atchison County, Missouri; 10 counties in Nebraska. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jun 27, 2017, 11:33 PM CDT (04:33 UTC)
Expired: Jun 28, 2017, 12:30 AM CDT
In force: 57 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Crawford County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Shelby County, IA, Atchison County, MO, Burt County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Lancaster County, NE, Otoe County, NE, Sarpy County, NE, Saunders County, NE, Thurston County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 29 km from the middle of the area, began a volume at 04:36 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, 4.6 hours before the alert went out and 30 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: 884 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1175 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jun 27, 7:35 PM CDT	Severe Thunderstorm Watch	SPC	Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux and 1 more	5 hr
Jun 28, 2:14 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 51 more	2 hr
Jun 28, 2:53 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 66 more	9 hr
Jun 28, 5:29 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 52 more	91 min
Jun 27, 8:12 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Boyd, Brown, Buffalo and 27 more	93 min
Jun 27, 8:56 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Butler and 37 more	5 hr
Jun 28, 4:07 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	113 min
Jun 28, 5:46 PM CDT	Mesoscale Discussion	SPC	Gage, Jefferson, Johnson, Pawnee, Richardson, Thayer	89 min

Nearby

Mesoscale Discussions in Nebraska, 2017 Mesoscale Discussions in Iowa, 2017 Mesoscale Discussions in Missouri, 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.