Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1042
The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2021, 9:56 PM CDT for 8 counties in Missouri. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2021, 9:56 PM CDT (02:56 UTC)
- Expired
- Jun 20, 2021, 11:00 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 294
Counties Bates County, MO, Cass County, MO, Cooper County, MO, Henry County, MO, Johnson County, MO, Lafayette County, MO, Pettis County, MO, Saline County, MO
The radar
The Pleasant Hill radar (KEAX), 58 km from the middle of the area, began a volume at 02:59 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
Topeka, KS (KTOP), launched 00:00Z, 2.9 hours before the alert went out and 178 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
- 2316 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 2228 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.8
The text
As transmitted.
270
ACUS11 KWNS 210257
SWOMCD
SPC MCD 210256
MOZ000-KSZ000-210400-
Mesoscale Discussion 1042
NWS Storm Prediction Center Norman OK
0956 PM CDT Sun Jun 20 2021
Areas affected...North-central Missouri and far eastern Kansas.
Concerning...Severe Thunderstorm Watch 294...
Valid 210256Z - 210400Z
The severe weather threat for Severe Thunderstorm Watch 294
continues.
SUMMARY...A few severe storms with a threat for strong wind gusts
will remain possible across the far southern fringe of WW294 through
the 0400z expiration time.
DISCUSSION...As of 0240z, RADAR data showed a loosely organized band
of storms stretching from near Kansas City into north-central
Missouri. Storm coverage has increased likely as a result of
strengthening low-level warm advection with the nocturnal low-level
jet. Flow associated with the jet will remain largely parallel to
the ongoing band of storms suggesting slower forward propagating
speeds and additional development focused along the southern flank.
Mostly non-severe gusts have been observed over the last 40 minutes,
but storms will likely remain capable of isolated damaging gusts as
they exit the southern portions of WW294 over the next hour.
Additional cellular development to the west across far eastern
Kansas may grow upscale and continue to the east posing a risk for
isolated gusts and or small hail after 04z. While convective
coverage is forecast to increase, the threat for severe weather
should gradually abate through 0400z as the boundary layer separates
and inhibition increases.
..Lyons.. 06/21/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...SGF...EAX...
LAT...LON 39239375 39359313 39279281 38989262 38769268 38719281
38639323 38399371 38179432 38249461 38509469 38889464
39239375SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:10 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Boone, Callaway, Knox, Lewis, Lincoln and 7 more | 5 hr |
| Jun 20, 9:54 PM CDT | Mesoscale Discussion | SPC | Monroe, Ralls | 66 min |
| Jun 21, 11:35 AM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 85 min |
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.