Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1988
The Storm Prediction Center issued this mesoscale discussion at Dec 10, 2021, 7:02 PM CST for 10 counties in Illinois; 22 counties in Missouri. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Dec 10, 2021, 7:02 PM CST (01:02 UTC)
- Expired
- Dec 10, 2021, 8:00 PM CST
- In force
- 58 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 553
All 32 counties
Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Scott County, IL, Callaway County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Texas County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 01:03 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, 1.0 hours before the alert went out and 264 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
- 119 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 341 m²/s²
- 0-3 km storm-relative helicity
- 357 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
197
ACUS11 KWNS 110103
SWOMCD
SPC MCD 110102
ILZ000-MOZ000-110200-
Mesoscale Discussion 1988
NWS Storm Prediction Center Norman OK
0702 PM CST Fri Dec 10 2021
Areas affected...Eastern Missouri and western Illinois
Concerning...Tornado Watch 553...
Valid 110102Z - 110200Z
The severe weather threat for Tornado Watch 553 continues.
SUMMARY...The damaging wind and tornado threat is increasing across
eastern Missouri and western Illinois, including the St. Louis Metro
area.
DISCUSSION...A line of storms has organized across central Missouri
and is moving quickly east toward the Mississippi River. Within this
line are several embedded supercells with some low-level rotation
evident from the KLSX WSR-88D. The storm with the coldest cloud tops
is currently moving toward St. Louis. Therefore, this portion of the
line in particular may have a greater severe wind/tornado threat
over the next 1 to 2 hours, especially given the backed surface flow
and around 500 m2/s2 0-1 km SRH from the KLSX VWP.
..Bentley.. 12/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PAH...ILX...LSX...SGF...
LAT...LON 39609124 39779070 39598994 38498949 37788974 37409094
37259193 37439234 38989191 39459149 39609124SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 7:18 PM CST | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 18 more | 87 min |
| Dec 10, 7:47 PM CST | Tornado Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 21 more | 8 hr |
| Dec 10, 8:53 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Coles and 21 more | 97 min |
| Dec 10, 9:36 PM CST | Mesoscale Discussion | SPC | Clark, Coles, Cumberland, Edgar, Effingham, Shelby | 54 min |
| Dec 10, 10:09 PM CST | Mesoscale Discussion | SPC | Massac | 96 min |
| Dec 10, 11:03 PM CST | Tornado Watch | SPC | Alexander, Clinton, Edwards, Fayette, Franklin, Gallatin and 17 more | 5 hr |
| Dec 10, 11:28 PM CST | Mesoscale Discussion | SPC | Alexander, Clark, Clay, Coles, Crawford, Cumberland and 24 more | 92 min |
| Dec 10, 6:22 PM CST | Mesoscale Discussion | SPC | Dunklin, New Madrid, Pemiscot | 53 min |
| Dec 10, 7:41 PM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 64 min |
| Dec 10, 7:54 PM CST | Mesoscale Discussion | SPC | Christian, Crawford, Dallas, Dent, Douglas, Greene and 10 more | 2 hr |
| Dec 10, 9:40 PM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 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.