Alert archive / Nebraska / Mesoscale Discussions in 2021
Mesoscale Discussion 1026
The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2021, 11:09 PM CDT for 4 states. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2021, 11:09 PM CDT (04:09 UTC)
- Expired
- Jun 20, 2021, 12:45 AM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 291
All 64 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Osborne County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Smith County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE
The radar
The Omaha radar (KOAX), 96 km from the middle of the area, began a volume at 04:11 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.2 hours before the alert went out and 96 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2439 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
457
ACUS11 KWNS 200409
SWOMCD
SPC MCD 200409
IAZ000-MOZ000-KSZ000-NEZ000-200545-
Mesoscale Discussion 1026
NWS Storm Prediction Center Norman OK
1109 PM CDT Sat Jun 19 2021
Areas affected...north-central/northeast
KS...south-central/southeast NE...southwest IA...northwest MO
Concerning...Severe Thunderstorm Watch 291...
Valid 200409Z - 200545Z
The severe weather threat for Severe Thunderstorm Watch 291
continues.
SUMMARY...An pronounced bowing line of severe thunderstorms will
pose a threat for damaging winds east of Severe Thunderstorm Watch
291, and a downstream watch will be issued prior to 05z.
DISCUSSION...A pronounced bowing line of severe thunderstorms
extended from Kearney County NE south to Russell County, KS at 04z.
The line was moving northeast at 50 mph, and has produced numerous
severe wind reports, several in excess of 80 mph. A strengthening
low-level jet and MUCAPE in excess of 3000 J/kg along and south of
an east-west stationary front will provide a very favorable
environment for the system to maintain its structure and damaging
wind potential into far eastern NE, northwest MO and portions of
western IA into the early morning hours. Thus, a new Severe
Thunderstorm Watch will be needed prior to 05z.
..Bunting.. 06/20/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...OAX...TOP...ICT...GID...
LAT...LON 39959905 40429950 41079822 41569673 41779585 41839496
41789433 41559398 40759393 40149424 39869498 39359631
39169733 39209814 39279889 39959905SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 4 hr |
| Jun 20, 3:37 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 12 more | 113 min |
| Jun 20, 10:57 AM CDT | Mesoscale Discussion | SPC | Des Moines, Henry, Lee, Louisa, Scott | 2 hr |
| Jun 20, 1:10 PM CDT | Mesoscale Discussion | SPC | Boone, Butler, Calhoun, Cerro Gordo, Emmet, Floyd and 17 more | 95 min |
| Jun 20, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo and 23 more | 7 hr |
| Jun 20, 2:02 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Boone, Cass, Clarke and 22 more | 118 min |
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Benton, Boone, Buchanan, Cedar, Clarke and 35 more | 7 hr |
| Jun 20, 5:22 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 9 more | 113 min |
| Jun 20, 6:56 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 15 more | 2 hr |
| Jun 19, 7:22 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Logan, Rawlins, Sherman, Thomas and 1 more | 113 min |
| Jun 19, 9:00 PM CDT | Mesoscale Discussion | SPC | Cloud, Decatur, Graham, Jewell, Mitchell, Norton and 7 more | 60 min |
| Jun 19, 9:43 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Clay, Cloud, Ellsworth, Jewell, Lincoln and 10 more | 4 hr |
| Jun 19, 9:49 PM CDT | Mesoscale Discussion | SPC | Audrain, Chariton, Lincoln, Macon, Monroe, Montgomery and 7 more | 56 min |
Nearby
Mesoscale Discussions in Nebraska, 2021Mesoscale Discussions in Iowa, 2021Mesoscale Discussions in Kansas, 2021Every mesoscale discussion in 2021
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.