Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1074
The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2021, 5:02 AM CDT for 14 counties in Iowa; 32 counties in Missouri. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2021, 5:02 AM CDT (10:02 UTC)
- Expired
- Jun 24, 2021, 7:00 AM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 308
All 46 counties
Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Monroe County, IA, Ringgold County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Adair County, MO, Andrew County, MO, Boone County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Clinton County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Howard County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Putnam County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO
The radar
The Des Moines radar (KDMX), 187 km from the middle of the area, began a volume at 10:05 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, 10.0 hours before the alert went out and 261 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
- 1823 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 391 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
121
ACUS11 KWNS 241002
SWOMCD
SPC MCD 241002
MOZ000-IAZ000-KSZ000-241200-
Mesoscale Discussion 1074
NWS Storm Prediction Center Norman OK
0502 AM CDT Thu Jun 24 2021
Areas affected...Southern Iowa...Northern Missouri
Concerning...Severe Thunderstorm Watch 308...
Valid 241002Z - 241200Z
The severe weather threat for Severe Thunderstorm Watch 308
continues.
SUMMARY...An isolated wind-damage threat will likely continue for a
few more hours across parts of the lower Missouri Valley. The threat
should become increasingly marginal with time and new weather watch
issuance downstream appears unlikely.
DISCUSSION...The latest radar imagery from Omaha shows a
well-developed bowing line segment in southwest Iowa and far
northwest Missouri. This line is expected to remain intact for a few
more hours, turning southeastward and moving across the remainder of
southern Iowa and northwest Missouri. A wind-damage threat will
likely continue for a few more hours. However, the RAP is showing
much weaker instability across southeast Iowa and north-central
Missouri, which is supported by cooler temperatures and lower
dewpoints evident in the surface observations. As this convective
line moves eastward toward the weaker instability, the severe threat
should become increasingly marginal. Although the line may continue
beyond the expiration of WW 308, new weather watch issuance will
probably not be necessary.
..Broyles.. 06/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LSX...DVN...DMX...EAX...
LAT...LON 40919198 40419157 39769147 39029202 38809296 39189401
39919500 41039458 41689373 40919198SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 8:10 PM CDT | Mesoscale Discussion | SPC | Monona, Plymouth, Woodbury | 95 min |
| Jun 23, 10:12 PM CDT | Mesoscale Discussion | SPC | Harrison, Mills, Monona, Pottawattamie | 93 min |
| Jun 23, 10:37 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Pottawattamie, Shelby and 1 more | 6 hr |
| Jun 24, 1:36 AM CDT | Mesoscale Discussion | SPC | Adams, Cass, Fremont, Harrison, Mills, Montgomery and 4 more | 114 min |
| Jun 24, 2:20 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 15 more | 6 hr |
| Jun 24, 3:44 PM CDT | Tornado Watch | SPC | Fremont, Page | 5 hr |
| Jun 24, 5:30 PM CDT | Mesoscale Discussion | SPC | Fremont, Page | 60 min |
| Jun 24, 6:19 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Lucas, Monroe and 3 more | 56 min |
| Jun 24, 6:33 PM CDT | Tornado Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 6 more | 3 hr |
Nearby
Mesoscale Discussions in Missouri, 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.