Alert archive / Missouri / Mesoscale Discussions in 2021
Mesoscale Discussion 1401
The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2021, 11:09 PM CDT for Brown County, Doniphan County, Kansas; 8 counties in Missouri; Nemaha County, Richardson County, Nebraska. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2021, 11:09 PM CDT (04:09 UTC)
- Expired
- Jul 31, 2021, 12:45 AM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 405
Counties Brown County, KS, Doniphan County, KS, Andrew County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Nemaha County, NE, Richardson County, NE
The radar
The Pleasant Hill radar (KEAX), 156 km from the middle of the area, began a volume at 04:10 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, 4.2 hours before the alert went out and 140 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
- 1481 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 2071 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
The text
As transmitted.
575 ACUS11 KWNS 310410 SWOMCD SPC MCD 310409 MOZ000-KSZ000-NEZ000-310545- Mesoscale Discussion 1401 NWS Storm Prediction Center Norman OK 1109 PM CDT Fri Jul 30 2021 Areas affected...Southeast Nebraska...Northern Missouri Concerning...Severe Thunderstorm Watch 405... Valid 310409Z - 310545Z The severe weather threat for Severe Thunderstorm Watch 405 continues. SUMMARY...Isolated hail/wind threat will continue to sag south across ww405. DISCUSSION...Loosely organized squall line has formed along the IA/MO border. Low-level warm advection appears to be aiding this activity as it propagates south-southeast at roughly 25kt. Ample buoyancy and a focused, but veered, LLJ suggest this activity will continue for several more hours. Primary threats remain gusty winds and marginally severe hail. ..Darrow.. 07/31/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...EAX...OAX...TOP... LAT...LON 40439593 40439356 39669358 39679557 40439593
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 8:47 PM CDT | Severe Thunderstorm Watch | SPC | Atchison, Brown, Doniphan, Jackson, Jefferson, Leavenworth and 2 more | 5 hr |
| Jul 30, 11:05 PM CDT | Mesoscale Discussion | SPC | Brown, Doniphan | 85 min |
| Jul 31, 12:54 AM CDT | Mesoscale Discussion | SPC | Doniphan, Wyandotte | 66 min |
| Jul 31, 2:40 PM CDT | Mesoscale Discussion | SPC | Barber, Clark, Comanche, Cowley, Harper, Kingman and 5 more | 2 hr |
| Jul 30, 8:16 PM CDT | Mesoscale Discussion | SPC | Atchison | 59 min |
| Jul 31, 11:00 AM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dent, Howell and 16 more | 2 hr |
| Jul 31, 5:09 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Bollinger, Butler, Camden, Carter and 37 more | 2 hr |
| Jul 30, 9:36 PM CDT | Mesoscale Discussion | SPC | Brown, Garfield, Loup, Rock | 24 min |
| Jul 30, 9:46 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Blaine, Boone, Brown, Garfield, Greeley and 8 more | 4 hr |
Nearby
Mesoscale Discussions in Missouri, 2021Mesoscale Discussions in Kansas, 2021Mesoscale Discussions in Nebraska, 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.