Alert archive / Nebraska / Mesoscale Discussions in 2020

Mesoscale Discussion 1065

June 30, 20206 counties in Iowa; 18 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2020, 10:46 PM CDT for 6 counties in Iowa; 18 counties in Nebraska. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2020, 10:46 PM CDT (03:46 UTC)
Expired: Jul 1, 2020, 12:15 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

All 24 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Woodbury County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thurston County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 20 km from the middle of the area, began a volume at 03:48 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 321Jun 30, 11:25 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.8 hours before the alert went out and 20 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: 3121 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 59 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
Jun 30, 11:25 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more	7 hr
Jul 1, 1:48 AM CDT	Mesoscale Discussion	SPC	Cass, Fremont, Mills, Montgomery, Page, Pottawattamie and 2 more	87 min
Jun 30, 9:26 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Boyd, Buffalo, Cedar and 33 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2020 Mesoscale Discussions in Iowa, 2020 Every mesoscale discussion in 2020

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.