Alert archive / Kansas / Mesoscale Discussions in 2021
Mesoscale Discussion 927
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2021, 3:28 PM CDT for 5 counties in Kansas; Bates County, Cass County, Jackson County, Missouri. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2021, 3:28 PM CDT (20:28 UTC)
- Expired
- Jun 11, 2021, 5:00 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 259
Counties Anderson County, KS, Franklin County, KS, Johnson County, KS, Linn County, KS, Miami County, KS, Bates County, MO, Cass County, MO, Jackson County, MO
The radar
The Pleasant Hill radar (KEAX), 49 km from the middle of the area, began a volume at 20:28 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 12:00Z, 8.5 hours before the alert went out and 87 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
- 2135 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 1019 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.2
The text
As transmitted.
038
ACUS11 KWNS 112029
SWOMCD
SPC MCD 112028
MOZ000-KSZ000-112200-
Mesoscale Discussion 0927
NWS Storm Prediction Center Norman OK
0328 PM CDT Fri Jun 11 2021
Areas affected...western MO...eastern KS
Concerning...Severe Thunderstorm Watch 259...
Valid 112028Z - 112200Z
The severe weather threat for Severe Thunderstorm Watch 259
continues.
SUMMARY...Intense embedded cores within a squall line straddling the
MO/KS border will pose a focused risk for gusts ranging from 60-70
mph (locally up to 85 mph) along the I-49 corridor through 5pm.
DISCUSSION...10-km CAPPI data shows a cluster of deeper thunderstorm
cores embedded within the southeast-moving squall line. It appears
the capping inversion observed on the 11am Topeka, KS raob has
largely thwarted development on the western periphery of the MCS so
far this afternoon. The forced ascent via the leading edge of the
cold pool (i.e., where it is deepest/strongest near the MO/KS
border) has overcome this inhibition and continues to promote/focus
where storms and the severe risk is greatest. The airmass over
southwest MO is characterized as very unstable per the 2pm
Springfield, MO raob (3000 J/kg MLCAPE). However, it appears
greater buoyancy is probably over southeast KS where OK Mesonet and
a few of the southeast KS observations show dewpoints in the 76-78
deg F range. The richer low-level moisture over southeast KS shows
6200 J/kg SBCAPE (implied 4500 J/kg MLCAPE) when the sounding is
modified for mid afternoon surface observations. Given the very
unstable to extremely unstable airmass south of the ongoing MCS,
expecting the severe risk to continue with swaths of severe gusts
ranging in the 60-70 mph range (locally up to 85 mph).
..Smith.. 06/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...EAX...TOP...
LAT...LON 38729539 38959465 39389427 39179396 38459400 38179424
38139503 38129533 38319542 38729539SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:30 AM CDT | Severe Thunderstorm Watch | SPC | Atchison, Brown, Clay, Doniphan, Jackson, Marshall and 4 more | 7 hr |
| Jun 11, 10:28 AM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Jackson, Marshall, Nemaha and 1 more | 2 hr |
| Jun 11, 12:32 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Butler, Chase, Coffey, Dickinson and 17 more | 6 hr |
| Jun 11, 1:55 PM CDT | Mesoscale Discussion | SPC | Douglas, Franklin, Jefferson, Johnson, Leavenworth, Miami and 3 more | 95 min |
| Jun 11, 2:52 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Atchison, Bourbon, Butler, Chase and 31 more | 113 min |
| Jun 11, 3:54 PM CDT | Severe Thunderstorm Watch | SPC | Bourbon, Cherokee, Crawford | 6 hr |
| Jun 11, 5:39 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Cherokee, Coffey, Crawford and 13 more | 2 hr |
| Jun 11, 6:18 PM CDT | Mesoscale Discussion | SPC | Butler, Chautauqua, Cherokee, Cowley, Elk, Greenwood and 10 more | 117 min |
| Jun 11, 6:46 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Butler, Chase, Chautauqua, Cowley, Elk and 10 more | 7 hr |
Nearby
Mesoscale Discussions in Kansas, 2021Mesoscale Discussions in Missouri, 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.