Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1019
The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2021, 5:11 PM CDT for 12 counties in Illinois; 14 counties in Missouri. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2021, 5:11 PM CDT (22:11 UTC)
- Expired
- Jun 19, 2021, 6:15 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 287
All 26 counties
Calhoun County, IL, Clinton 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, Washington County, IL, Audrain County, MO, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 32 km from the middle of the area, began a volume at 22:11 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 12:00Z, 10.2 hours before the alert went out and 224 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
- 1960 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 203 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
635
ACUS11 KWNS 192211
SWOMCD
SPC MCD 192211
ILZ000-MOZ000-192315-
Mesoscale Discussion 1019
NWS Storm Prediction Center Norman OK
0511 PM CDT Sat Jun 19 2021
Areas affected...eastern MO...western IL
Concerning...Severe Thunderstorm Watch 287...
Valid 192211Z - 192315Z
The severe weather threat for Severe Thunderstorm Watch 287
continues.
SUMMARY...Large hail and damaging winds continues to be possible
with storms across the watch area.
DISCUSSION...A cluster of severe storms was in progress in the St.
Louis area at 2210z, with a history of damaging winds and severe
hail. New development was occurring upstream in the vicinity of
Hannibal, MO, where upwards of 4000 J/kg of MLCAPE is present. The
region is on the southern periphery of stronger mid-level flow, and
35-40 kts of northwesterly effective shear will continue to be
conducive for supercells with a wind and hail threat. Where
additional storm mergers occur, a more concentrated damaging wind
risk will be possible with southward moving clusters.
..Bunting.. 06/19/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PAH...ILX...LSX...
LAT...LON 37958976 38259084 38729161 38909179 39559224 40009224
39939144 39789066 39288972 39018958 38508921 37958976SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 8:53 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Cass, Christian, Clark, Clay and 26 more | 97 min |
| Jun 18, 9:20 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 33 more | 7 hr |
| Jun 18, 9:27 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Hancock, Henderson, McDonough, Mercer and 2 more | 2 hr |
| Jun 18, 10:08 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Bureau, Hancock, Henderson, Henry and 6 more | 8 hr |
| Jun 19, 2:10 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 27 more | 2 hr |
| Jun 19, 11:15 AM CDT | Mesoscale Discussion | SPC | Effingham, Fayette, Greene, Macoupin, Montgomery, Morgan and 1 more | 2 hr |
| Jun 19, 2:12 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Greene, Jersey, Macoupin and 7 more | 93 min |
| Jun 19, 2:43 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 9 more | 7 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.