Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 564
The Storm Prediction Center issued this mesoscale discussion at May 8, 2021, 9:15 PM CDT for 25 counties in Kansas; 35 counties in Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 8, 2021, 9:15 PM CDT (02:15 UTC)
- Expired
- May 8, 2021, 11:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 154
All 60 counties
Allen County, KS, Anderson County, KS, Atchison County, KS, Bourbon County, KS, Brown County, KS, Coffey County, KS, Crawford County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Lyon County, KS, Miami County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Barton County, MO, Bates County, MO, Benton County, MO, Buchanan County, MO, Caldwell County, MO, Camden County, MO, Carroll County, MO, Cass County, MO, Cedar County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Jackson County, MO, Jasper County, MO, Johnson County, MO, Laclede County, MO, Lafayette County, MO, Lawrence County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Pettis County, MO, Platte County, MO, Polk County, MO, Ray County, MO, Saline County, MO, St. Clair County, MO, Vernon County, MO, Webster County, MO
The radar
The Pleasant Hill radar (KEAX), 54 km from the middle of the area, began a volume at 02:15 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, 2.3 hours before the alert went out and 107 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
- 377 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 1653 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 362 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.0
The text
As transmitted.
707
ACUS11 KWNS 090215
SWOMCD
SPC MCD 090215
MOZ000-KSZ000-090415-
Mesoscale Discussion 0564
NWS Storm Prediction Center Norman OK
0915 PM CDT Sat May 08 2021
Areas affected...Northeast Kansas...Missouri
Concerning...Tornado Watch 154...
Valid 090215Z - 090415Z
The severe weather threat for Tornado Watch 154 continues.
SUMMARY...A wind damage, large hail and tornado threat will continue
late this evening, affecting northeast Kansas and parts of Missouri.
The severe threat will likely persist into the early overnight
period necessitating a new watch further to the east.
DISCUSSION...The latest radar imagery shows a cluster of strong to
severe thunderstorms located from near Salina, Kansas northward into
far southeast Nebraska. These storms are located along the northern
edge of a moderately unstable airmass. The instability and moisture
gradient extends east-southeastward across eastern Kansas into
western and southern Missouri, along which a warm front is analyzed.
Storm coverage will continue to increase with a linear MCS
developing and moving southeastward along this gradient. As a cold
pool organizes, supercells that remain intact as the line forms,
will continue to have a threat for large hail and wind damage. The
WSR-88D VWP at Topeka, Kansas shows a looped hodograph with 0-3 km
storm relative helicity near 450 m2/s2. This will continue the
tornado threat, especially with supercells. The wind-damage threat
is expected to increase as the linear MCS matures, continuing after
midnight as the line moves into western Missouri.
..Broyles.. 05/09/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LSX...SGF...EAX...TOP...ICT...
LAT...LON 38699671 38069571 37449478 37079414 37009320 37499240
38279220 39109257 39959458 39999598 39389675 38699671SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 9:51 PM CDT | Severe Thunderstorm Watch | SPC | Bourbon, Johnson, Leavenworth, Linn, Miami, Wyandotte | 7 hr |
| May 8, 11:25 PM CDT | Mesoscale Discussion | SPC | Douglas, Franklin, Jefferson, Johnson, Leavenworth, Miami and 1 more | 2 hr |
| May 9, 1:39 AM CDT | Mesoscale Discussion | SPC | Bourbon, Linn, Miami | 96 min |
| May 9, 3:46 AM CDT | Mesoscale Discussion | SPC | Camden, Christian, Dade, Dallas, Dent, Douglas and 14 more | 119 min |
Nearby
Mesoscale Discussions in Missouri, 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.