Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1088
The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2021, 11:23 PM CDT for 15 counties in Illinois; Lee County, Iowa; 22 counties in Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2021, 11:23 PM CDT (04:23 UTC)
- Expired
- Jun 25, 2021, 1:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 312
All 38 counties
Lee County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Clark County, MO, Cole County, MO, Cooper County, MO, Gasconade County, MO, Howard County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 137 km from the middle of the area, began a volume at 04:27 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
Davenport, (KDVN), launched 00:00Z, 4.4 hours before the alert went out and 227 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
- 112 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 817 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted.
247
ACUS11 KWNS 250423
SWOMCD
SPC MCD 250423
ILZ000-MOZ000-IAZ000-250630-
Mesoscale Discussion 1088
NWS Storm Prediction Center Norman OK
1123 PM CDT Thu Jun 24 2021
Areas affected...northeastern and east-central Missouri into
west-central Illinois
Concerning...Severe Thunderstorm Watch 312...
Valid 250423Z - 250630Z
The severe weather threat for Severe Thunderstorm Watch 312
continues.
SUMMARY...Eastward advancement of a well-organized MCS continues,
along with local wind damage risk.
DISCUSSION...Latest radar loop shows a clearly defined mesolow just
south of TVK/northwest of IRK, with a well-organized bowing line
crossing the northern half of Missouri. No recent reports of
severe-caliber wind gusts have been received, but given the
available instability ahead of the band and the observed degree of
organization, strong/potentially damaging wind gusts remain possible
along the line. Storms are approaching the southern fringe of the
watch across Missouri, and will eventually do the same on the
eastern fringe over west-central Illinois. We will continue to
monitor convective trends, with respect to possible need for WW
extensions in time/area, or possible new WW issuance.
..Goss.. 06/25/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...ILX...LSX...DVN...DMX...EAX...
LAT...LON 40579238 40759216 40759161 40659044 40018962 39258976
38649044 38369141 38409222 38979337 39529228 40169203
40579238SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 8:57 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Hancock, Pike | 6 hr |
| Jun 24, 11:47 PM CDT | Tornado Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 18 more | 4 hr |
| Jun 25, 12:57 PM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Crawford, Edwards, Franklin, Gallatin and 15 more | 2 hr |
| Jun 25, 4:46 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 23 more | 59 min |
| Jun 25, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Champaign, Christian and 30 more | 6 hr |
| Jun 25, 6:47 PM CDT | Severe Thunderstorm Watch | SPC | Kankakee | 4 hr |
| Jun 24, 7:29 PM CDT | Mesoscale Discussion | SPC | Fremont, Page, Ringgold, Taylor | 61 min |
| Jun 25, 1:00 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Buchanan, Buena Vista, Butler and 29 more | 2 hr |
| Jun 24, 8:33 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Audrain, Bates, Benton, Boone and 49 more | 87 min |
| Jun 25, 11:56 AM CDT | Mesoscale Discussion | SPC | Bates, Benton, Cass, Cedar, Dade, Dallas and 8 more | 3 hr |
| Jun 25, 1:43 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Carroll, Cass, Cedar and 14 more | 9 hr |
| Jun 25, 3:13 PM CDT | Mesoscale Discussion | SPC | Bates, Benton, Camden, Cass, Henry, Hickory and 7 more | 2 hr |
| Jun 25, 6:21 PM CDT | Mesoscale Discussion | SPC | Bates, Henry, Hickory, St. Clair, Vernon | 84 min |
Nearby
Mesoscale Discussions in Missouri, 2021Mesoscale Discussions in Illinois, 2021Mesoscale Discussions in Iowa, 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.