Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1025
The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2021, 9:49 PM CDT for 13 counties in Missouri. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2021, 9:49 PM CDT (02:49 UTC)
- Expired
- Jun 19, 2021, 10:45 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 287
Counties Audrain County, MO, Chariton County, MO, Lincoln County, MO, Macon County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 110 km from the middle of the area, began a volume at 02:48 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
Davenport, (KDVN), launched 00:00Z, 2.8 hours before the alert went out and 287 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
- 2652 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
109
ACUS11 KWNS 200249
SWOMCD
SPC MCD 200249
MOZ000-ILZ000-200345-
Mesoscale Discussion 1025
NWS Storm Prediction Center Norman OK
0949 PM CDT Sat Jun 19 2021
Areas affected...portions of east-central and northern MO
Concerning...Severe Thunderstorm Watch 287...
Valid 200249Z - 200345Z
The severe weather threat for Severe Thunderstorm Watch 287
continues.
SUMMARY...An isolated severe threat may continue in and west of
Severe Thunderstorm Watch 287, however a new watch is not
anticipated.
DISCUSSION...Strong/occasionally severe storms were occurring across
east-central/northeast MO as of 0225z. Trends in radar/reports
continue to show a general decrease in intensity over the watch area
during the past hour as MLCIN gradually increases due to nocturnal
cooling. The more likely area for additional thunderstorm
development over the next few hours is west of the current watch
over north-central MO, where modest convergence and lower MLCIN is
present. With strong instability and 25-30 kts of effective shear,
the potential for an isolated severe storm will exist for the next
few hours.
Given the expected isolated nature of the remaining severe risk, an
additional watch is not anticipated however convective trends will
be monitored.
..Bunting.. 06/20/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LSX...EAX...
LAT...LON 38359068 38969190 39179235 39379326 39789316 39909267
39879183 39749146 39389098 38579035 38359068SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 11:09 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Gentry, Holt, Nodaway, Worth | 96 min |
| Jun 19, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Gentry, Holt, Nodaway, Worth | 4 hr |
| Jun 20, 3:37 AM CDT | Mesoscale Discussion | SPC | Adair, Daviess, DeKalb, Gentry, Grundy, Harrison and 5 more | 113 min |
| Jun 20, 10:57 AM CDT | Mesoscale Discussion | SPC | Clark, Lewis, Marion | 2 hr |
| Jun 20, 2:02 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more | 118 min |
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 21 more | 7 hr |
| Jun 20, 6:56 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Audrain, Buchanan, Caldwell, Carroll and 30 more | 2 hr |
Nearby
Mesoscale Discussions in Missouri, 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.