Alert archive / Nebraska / Mesoscale Discussions in 2026

Mesoscale Discussion 2039

August 19, 20264 counties in Iowa; Atchison County, Missouri; 18 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2026, 12:26 PM CDT for 4 counties in Iowa; Atchison County, Missouri; 18 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 19, 2026, 12:26 PM CDT (17:26 UTC)
Expired: Aug 19, 2026, 2:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 599

All 23 counties

Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Atchison County, MO, Butler County, NE, Cass County, NE, Clay County, NE, Fillmore County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, York County, NE

The radar

The Omaha radar (KOAX), 79 km from the middle of the area, began a volume at 17:25 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 600Aug 19, 2:50 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 5.4 hours before the alert went out and 79 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: 819 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

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 19, 9:53 AM CDT	Severe Thunderstorm Watch	SPC	Fremont	6 hr
Aug 19, 2:30 PM CDT	Mesoscale Discussion	SPC	Page, Ringgold, Taylor	90 min
Aug 19, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	Page, Taylor	5 hr
Aug 18, 7:46 PM CDT	Mesoscale Discussion	SPC	Cass, Clay, Jackson, Johnson, Lafayette, Platte and 1 more	2 hr
Aug 18, 9:57 PM CDT	Severe Thunderstorm Watch	SPC	Bates, Cass, Clay, Henry, Jackson, Johnson and 3 more	6 hr
Aug 18, 10:37 PM CDT	Mesoscale Discussion	SPC	Cass, Clay, Henry, Jackson, Johnson, Lafayette	23 min
Aug 18, 11:40 PM CDT	Mesoscale Discussion	SPC	Bates, Benton, Camden, Cass, Cooper, Henry and 7 more	95 min
Aug 19, 1:57 AM CDT	Mesoscale Discussion	SPC	Bates, Benton, Camden, Cass, Cole, Henry and 14 more	93 min
Aug 19, 3:23 AM CDT	Mesoscale Discussion	SPC	Benton, Camden, Cass, Cole, Cooper, Henry and 11 more	67 min
Aug 19, 3:00 PM CDT	Mesoscale Discussion	SPC	Carter, Christian, Crawford, Dallas, Dent, Douglas and 17 more	2 hr
Aug 19, 9:01 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Butler, Colfax, Garfield, Greeley and 5 more	119 min

Nearby

Mesoscale Discussions in Nebraska, 2026 Mesoscale Discussions in Iowa, 2026 Mesoscale Discussions in Missouri, 2026 Every mesoscale discussion in 2026

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.