Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1224
The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2021, 10:26 PM CDT for 13 counties in Illinois; 27 counties in Missouri. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Jul 9, 2021, 10:26 PM CDT (03:26 UTC)
- Expired
- Jul 9, 2021, 11:30 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 359
All 40 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Adair County, MO, Audrain County, MO, Boone County, MO, Callaway County, MO, Chariton County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Lincoln County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Sullivan County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 104 km from the middle of the area, began a volume at 03:28 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 nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.4 hours before the alert went out and 256 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
- 1282 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
977
ACUS11 KWNS 100326
SWOMCD
SPC MCD 100326
ILZ000-MOZ000-100430-
Mesoscale Discussion 1224
NWS Storm Prediction Center Norman OK
1026 PM CDT Fri Jul 09 2021
Areas affected...Northeast and central Missouri
Concerning...Tornado Watch 359...
Valid 100326Z - 100430Z
The severe weather threat for Tornado Watch 359 continues.
SUMMARY...Potential for severe/significant winds is increase in
parts of central/eastern Missouri as a broad mesocyclone continues
to develop and move south/southeastward.
DISCUSSION...A broad mesocyclone is evident on KLSX radar velocity
imagery roughly centered in Ralls County, MO. As this feature
continues southward into a moderate to strongly unstable
environment, the potential for significant wind gusts will increase
in portions of central/eastern Missouri. The 00Z SGF sounding
sampled 8+ C/km lapse rates with MLCAPE around 3000 J/kg. Strong
downdrafts will continue to be favored in this environment,
particularly as effective shear remains at 35-40 kts. Though storm
mode has become linear, KLSX VAD profile continues to show enough
low-level veering to support a threat for QLCS circulations and
brief tornadoes.
..Wendt.. 07/10/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...ILX...LSX...SGF...EAX...
LAT...LON 40469325 40129236 39909145 40189083 40238984 39758944
38688999 38309040 38009143 38319227 38669285 40469325SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Hancock, Henderson, McDonough, Warren | 3 hr |
| Jul 9, 7:54 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 9 more | 36 min |
| Jul 9, 8:18 PM CDT | Tornado Watch | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 9 more | 6 hr |
| Jul 10, 1:01 AM CDT | Mesoscale Discussion | SPC | Clinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 3 more | 59 min |
| Jul 10, 1:36 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Jackson and 10 more | 4 hr |
| Jul 10, 3:09 AM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Jackson, Johnson, Pulaski, Saline and 2 more | 2 hr |
| Jul 10, 1:25 PM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more | 2 hr |
| Jul 10, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Bond, Clay, Clinton, Crawford, Edwards and 28 more | 8 hr |
| Jul 10, 3:09 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, DeWitt, Douglas, Ford, Logan and 8 more | 96 min |
| Jul 10, 5:33 PM CDT | Mesoscale Discussion | SPC | Clay, Edwards, Franklin, Gallatin, Hamilton, Hardin and 10 more | 87 min |
| Jul 9, 9:12 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 8 more | 2 hr |
| Jul 9, 9:58 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Buchanan, Caldwell, Carroll, Chariton and 22 more | 7 hr |
| Jul 10, 1:21 AM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 11 more | 84 min |
| Jul 10, 2:57 AM CDT | Mesoscale Discussion | SPC | Bates, Caldwell, Carroll, Cass, Chariton, Clay and 20 more | 93 min |
| Jul 10, 5:04 AM CDT | Mesoscale Discussion | SPC | Butler, Carter, Ripley, Stoddard | 56 min |
| Jul 10, 11:37 AM CDT | Mesoscale Discussion | SPC | Barry, Christian, Douglas, Howell, Laclede, McDonald and 9 more | 83 min |
| Jul 10, 1:20 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Holt, Nodaway | 115 min |
| Jul 10, 2:17 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Jasper, McDonald, Newton, Vernon | 118 min |
| Jul 10, 2:18 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 6 more | 7 hr |
| Jul 10, 3:02 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Camden, Cedar, Christian, Dade and 26 more | 8 hr |
| Jul 10, 3:44 PM CDT | Mesoscale Discussion | SPC | Atchison, Holt | 91 min |
| Jul 10, 5:27 PM CDT | Mesoscale Discussion | SPC | Andrew, Buchanan, Caldwell, Carroll, Clay, Clinton and 13 more | 2 hr |
Nearby
Mesoscale Discussions in Missouri, 2021Mesoscale Discussions in Illinois, 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.