Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1234
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2021, 3:09 AM CDT for 8 counties in Illinois; 9 counties in Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2021, 3:09 AM CDT (08:09 UTC)
- Expired
- Jul 10, 2021, 5:15 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 364
Counties Alexander County, IL, Franklin County, IL, Jackson County, IL, Johnson County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Perry County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO
The radar
The Paducah radar (KPAH), 108 km from the middle of the area, began a volume at 08:10 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
Little Rock, AR (KLZK), launched 00:00Z, 8.2 hours before the alert went out and 280 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
- 1372 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1621 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
393
ACUS11 KWNS 100809
SWOMCD
SPC MCD 100809
ILZ000-MOZ000-ARZ000-101015-
Mesoscale Discussion 1234
NWS Storm Prediction Center Norman OK
0309 AM CDT Sat Jul 10 2021
Areas affected...southeastern Missouri/southern Illinois
Concerning...Severe Thunderstorm Watch 364...
Valid 100809Z - 101015Z
The severe weather threat for Severe Thunderstorm Watch 364
continues.
SUMMARY...Local risk for gusty/damaging winds continues across WW
364.
DISCUSSION...Latest radar loop shows near-continuous line of strong
storms moving southeastward across southeastern Missouri and
adjacent southern Illinois at around 30 kt. Ahead of the storms, an
airmass featuring 1000 to 1500 J/kg mixed-layer CAPE persists, which
should allow convection to persist as it advances steadily
southeastward. While the latest PAH WSR-88D VWP data shows only
moderate (AOB 30 kt) flow through the lower half of the troposphere,
a few stronger gusts remain possible given the still-organized
nature of the convective band.
..Goss.. 07/10/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PAH...MEG...LSX...SGF...
LAT...LON 37329078 37559010 38118912 38168874 37828843 37128915
36499019 36519095 37099113 37329078SPC 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 9, 10:26 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 7 more | 64 min |
| 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, 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.