Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1084
The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2021, 7:29 PM CDT for 4 states. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2021, 7:29 PM CDT (00:29 UTC)
- Expired
- Jun 24, 2021, 8:30 PM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 309...310
All 27 counties
Fremont County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE
The radar
The Topeka radar (KTWX), 154 km from the middle of the area, began a volume at 00:31 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
Topeka, KS (KTOP), launched 00:00Z, 0.5 hours before the alert went out and 129 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
- 2766 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1424 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 225 m²/s²
- 0-3 km storm-relative helicity
- 404 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 23.2
The text
As transmitted.
218
ACUS11 KWNS 250029
SWOMCD
SPC MCD 250029
MOZ000-IAZ000-KSZ000-NEZ000-250130-
Mesoscale Discussion 1084
NWS Storm Prediction Center Norman OK
0729 PM CDT Thu Jun 24 2021
Areas affected...northeast Kansas and southeastern Nebraska into
northwestern Missouri and southwest Iowa.
Concerning...Tornado Watch 309...310...
Valid 250029Z - 250130Z
The severe weather threat for Tornado Watch 309, 310 continues.
SUMMARY...The threat for damaging wind gusts, large hail, and a
couple tornadoes remains early this evening. A transition to more of
a damaging wind threat appears likely over the next hour or two.
DISCUSSION...Evening radar observations showed several clusters of
thunderstorms ongoing near the Kansas, Nebraska, Missouri, and Iowa
state lines. A cluster of HP supercells have evolved across far
northeast Kansas and northwestern Missouri. Additional discrete
development has taken place over the last 20 minutes south, near
Topeka. These rotating storms may continue to pose a risk for
tornadoes over the next couple of hours given strong low-level shear
and plentiful instability.
A transition to a more linear storm mode was observed across
southeastern Nebraska and western Iowa, north of the primary
baroclinic zone. This cluster is likely the beginning of a stronger
MCS depicted by CAM guidance to move southeast across northern and
central Missouri later this evening. Additional storm
development/conglomeration appears likely near sunset ahead of the
increasing low-level jet. A tornado or two will remain possible with
the better organized line segments given strong low-level shear, but
a transition to a greater damaging wind threat will likely evolve as
cold pools strengthen and storms turn southeastward toward 01-03z.
..Lyons.. 06/25/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...OAX...TOP...
LAT...LON 39179702 39789671 40559655 40829579 40849501 40799417
40679366 40449333 40349333 40209363 39699453 39509494
39229587 39179702SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 11:23 PM CDT | Mesoscale Discussion | SPC | Lee | 2 hr |
| Jun 24, 11:47 PM CDT | Tornado Watch | SPC | Des Moines, Henry, Lee | 4 hr |
| Jun 25, 1:00 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Buchanan, Buena Vista, Butler and 29 more | 2 hr |
| Jun 24, 8:13 PM CDT | Mesoscale Discussion | SPC | Barton, Edwards, Ellis, Ellsworth, Finney, Ford and 29 more | 2 hr |
| Jun 24, 8:33 PM CDT | Mesoscale Discussion | SPC | Atchison, Doniphan, Douglas, Franklin, Jefferson, Johnson and 3 more | 87 min |
| Jun 24, 8:57 PM CDT | Severe Thunderstorm Watch | SPC | Atchison, Douglas, Franklin, Geary, Jackson, Jefferson and 9 more | 6 hr |
| Jun 24, 10:30 PM CDT | Mesoscale Discussion | SPC | Clark, Edwards, Ellis, Finney, Ford, Gove and 14 more | 60 min |
| Jun 25, 1:40 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Butler, Chase, Coffey, Dickinson and 16 more | 3 hr |
| Jun 25, 11:56 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Butler, Chase, Coffey and 17 more | 3 hr |
| Jun 25, 1:21 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Jewell, Norton, Phillips, Rawlins and 4 more | 114 min |
| Jun 25, 1:43 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Bourbon, Butler, Chase, Coffey and 32 more | 9 hr |
| Jun 25, 2:11 PM CDT | Mesoscale Discussion | SPC | Clark, Finney, Ford, Gove, Grant, Gray and 18 more | 2 hr |
| Jun 25, 2:30 PM CDT | Severe Thunderstorm Watch | SPC | Barber, Barton, Clark, Comanche, Edwards, Finney and 20 more | 10 hr |
| Jun 25, 3:07 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Graham, Greeley, Jewell and 11 more | 6 hr |
| Jun 25, 3:13 PM CDT | Mesoscale Discussion | SPC | Anderson, Chase, Coffey, Douglas, Franklin, Johnson and 6 more | 2 hr |
| Jun 25, 5:54 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Gove, Graham, Greeley, Jewell and 11 more | 66 min |
| Jun 25, 6:21 PM CDT | Mesoscale Discussion | SPC | Allen, Bourbon, Butler, Greenwood, Harvey, Linn and 4 more | 84 min |
| Jun 25, 12:57 PM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Madison, Perry | 2 hr |
| Jun 25, 4:46 PM CDT | Mesoscale Discussion | SPC | Audrain, Boone, Callaway, Cole, Franklin, Gasconade and 14 more | 59 min |
| Jun 25, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Boone, Callaway, Camden, Cole, Crawford and 25 more | 6 hr |
Nearby
Mesoscale Discussions in Missouri, 2021Mesoscale Discussions in Kansas, 2021Mesoscale Discussions in Nebraska, 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.