Alert archive / Nebraska / Mesoscale Discussions in 2021
Mesoscale Discussion 1073
The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2021, 1:36 AM CDT for 4 states. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2021, 1:36 AM CDT (06:36 UTC)
- Expired
- Jun 24, 2021, 3:30 AM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 307
All 55 counties
Adams County, IA, Cass County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Nemaha County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Clinton County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Howard County, NE, Johnson County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Washington County, NE, York County, NE
The radar
The Omaha radar (KOAX), 64 km from the middle of the area, began a volume at 06:39 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, 6.6 hours before the alert went out and 64 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
- 2039 J/kg
- Mixed-layer CIN
- -306 J/kg
- Mixed-layer LCL
- 1664 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
760
ACUS11 KWNS 240637
SWOMCD
SPC MCD 240636
IAZ000-MOZ000-KSZ000-NEZ000-240830-
Mesoscale Discussion 1073
NWS Storm Prediction Center Norman OK
0136 AM CDT Thu Jun 24 2021
Areas affected...Eastern Nebraska...Far Northeast Kansas...Northwest
Missouri...Southwest Iowa
Concerning...Severe Thunderstorm Watch 307...
Valid 240636Z - 240830Z
The severe weather threat for Severe Thunderstorm Watch 307
continues.
SUMMARY...A potential for wind damage, isolated large hail and a
brief tornado will likely continue for several more hours. As the
MCS in northeast Nebraska moves southeastward toward the edge of
weather watch 307, a new watch will need to be considered.
DISCUSSION...The latest high-resolution radar imagery from Omaha
shows a well-developed bowing line segment located in northeast
Nebraska. A pronounced surface high-low couplet is evident behind
the bowing segment. Surface dewpoints ahead of the line are
generally in the lower 70s F, which is contributing to strong
instability. The RAP is analyzing a pocket of MLCAPE between 4000
and 4500 J/Kg. In addition, the Omaha WSR-88D VWP shows strong
directional shear in the low-levels with some speed shear in the mid
to upper levels. This wind profile along with a strong rear inflow
jet will continue support the bowing line segment as it moves
quickly southeastward across eastern Nebraska over the next couple
of hours. Wind damage will be likely along the leading edge with
wind gusts above 70 knots possible. Recently, the BVN observing site
reported a wind gust at 73 knots. Large hail and a brief tornado
will also be possible with the more intense rotating cells embedded
in the line. The line is expected to exit weather watch 307 by 09Z.
As it approaches the edge of the watch, a new watch will need to be
considered further downstream.
..Broyles/Edwards.. 06/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...OAX...TOP...GID...
LAT...LON 41569496 41919625 42079740 41919794 41539859 41219852
40639779 40129703 39559597 39349525 39329462 39849402
40379381 40849411 41569496SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 8:10 PM CDT | Mesoscale Discussion | SPC | Monona, Plymouth, Woodbury | 95 min |
| Jun 23, 10:12 PM CDT | Mesoscale Discussion | SPC | Harrison, Mills, Monona, Pottawattamie | 93 min |
| Jun 23, 10:37 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Pottawattamie, Shelby and 1 more | 6 hr |
| Jun 24, 2:20 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 15 more | 6 hr |
| Jun 24, 5:02 AM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Lucas, Madison and 8 more | 118 min |
| Jun 24, 3:44 PM CDT | Tornado Watch | SPC | Fremont, Page | 5 hr |
| Jun 24, 5:30 PM CDT | Mesoscale Discussion | SPC | Fremont, Page | 60 min |
| Jun 24, 6:19 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Lucas, Monroe and 3 more | 56 min |
| Jun 24, 6:33 PM CDT | Tornado Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 6 more | 3 hr |
| Jun 24, 2:45 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Douglas, Jackson, Jefferson, Leavenworth and 7 more | 3 hr |
| Jun 24, 2:49 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Logan, Rawlins, Sherman, Thomas, Wallace | 116 min |
| Jun 24, 3:14 PM CDT | Mesoscale Discussion | SPC | Gray, Haskell, Meade, Seward | 91 min |
| Jun 24, 4:56 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Finney, Gove, Grant, Gray and 13 more | 6 hr |
| Jun 24, 6:31 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Greeley, Hamilton, Kearny, Lane, Logan and 6 more | 119 min |
Nearby
Mesoscale Discussions in Nebraska, 2021Mesoscale Discussions in Missouri, 2021Mesoscale Discussions in Iowa, 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.