Alert archive / Kansas / Mesoscale Discussions in 2021
Mesoscale Discussion 319
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2021, 11:22 PM CDT for 9 counties in Kansas. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2021, 11:22 PM CDT (04:22 UTC)
- Expired
- Apr 7, 2021, 1:15 AM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 73
Counties Chase County, KS, Harvey County, KS, Kingman County, KS, Lyon County, KS, Marion County, KS, McPherson County, KS, Morris County, KS, Reno County, KS, Sedgwick County, KS
The radar
The Wichita radar (KICT), 40 km from the middle of the area, began a volume at 04:23 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, 4.4 hours before the alert went out and 199 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
- 342 J/kg
- Mixed-layer CIN
- -206 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 186 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted.
338 ACUS11 KWNS 070423 SWOMCD SPC MCD 070422 KSZ000-070615- Mesoscale Discussion 0319 NWS Storm Prediction Center Norman OK 1122 PM CDT Tue Apr 06 2021 Areas affected...Central Kansas Concerning...Severe Thunderstorm Watch 73... Valid 070422Z - 070615Z The severe weather threat for Severe Thunderstorm Watch 73 continues. SUMMARY...Strong/severe thunderstorms continue across central Kansas. DISCUSSION...Diffluent high-level flow ahead of approaching upper trough remains favorable for venting convection aloft. Earlier prefrontal convection has matured into an MCS that is propagating across central KS. Leading edge of this complex is bowing east in excess of 30kt, with a trailing flank that becomes more discrete northwest of Medicine Lodge in Pratt/Barber County. Over the last hour or so, stronger hail cores have weakened, though some large hail threat remains with the southern-most convection. With outflow now sagging up to 30 miles south of the MCS, the primary risk for severe appears to be shifting to the southern portions of ww73. ..Darrow.. 04/07/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TOP...ICT...DDC... LAT...LON 37429875 38679795 38859591 38199617 37509775 37429875
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 7:10 PM CDT | Mesoscale Discussion | SPC | Barton, Edwards, Ellis, Ellsworth, Jewell, Kingman and 14 more | 2 hr |
| Apr 6, 9:06 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Chase, Clay, Cloud, Coffey, Dickinson and 22 more | 5 hr |
| Apr 6, 9:11 PM CDT | Mesoscale Discussion | SPC | Barton, Clay, Cloud, Dickinson, Ellsworth, Geary and 8 more | 2 hr |
| Apr 7, 10:18 AM CDT | Mesoscale Discussion | SPC | Johnson, Miami, Wyandotte | 117 min |
Nearby
Mesoscale Discussions in Kansas, 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.