Alert archive / Kansas / Mesoscale Discussions in 2021
Mesoscale Discussion 725
The Storm Prediction Center issued this mesoscale discussion at May 24, 2021, 6:39 PM CDT for Decatur County, Norton County, Kansas. It was in force for 36 min.
The area
The outline as issued.
The facts
- Issued
- May 24, 2021, 6:39 PM CDT (23:39 UTC)
- Expired
- May 24, 2021, 7:15 PM CDT
- In force
- 36 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 200
Counties Decatur County, KS, Norton County, KS
The radar
The Goodland radar (KGLD), 138 km from the middle of the area, began a volume at 23:41 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.7 hours before the alert went out and 163 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
- 1599 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- -95 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
531
ACUS11 KWNS 242340
SWOMCD
SPC MCD 242339
KSZ000-NEZ000-250015-
Mesoscale Discussion 0725
NWS Storm Prediction Center Norman OK
0639 PM CDT Mon May 24 2021
Areas affected...Portions of Northwest/north-central Kansas
Concerning...Severe Thunderstorm Watch 200...
Valid 242339Z - 250015Z
The severe weather threat for Severe Thunderstorm Watch 200
continues.
SUMMARY...The potential for a tornado will continue from along the
Sheridan/Decatur County line into the Norton/Graham County line.
Downstream backing winds and temperature/dewpoint increases are
supportive.
DISCUSSION...A tornado has been confirmed near Selden, KS with a
supercell that has had relatively persistent 50-60 kt rotational
velocity on KGLD 0.5 degree velocity. The environment ahead of the
storm is expected to continue to support tornadic potential as winds
at Hill City and Norton have backed to east-southeast and
strengthened. Temperatures and dewpoints have also risen slightly. A
complicating factor could be developing convection in the inflow
region of the storm, now evident in Graham County. This could
potentially reduce tornado potential quicker than expected.
..Wendt.. 05/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GID...GLD...
LAT...LON 39720074 39980046 40079956 39759940 39539959 39420007
39430062 39720074SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 7:32 PM CDT | Mesoscale Discussion | SPC | Morton | 118 min |
| May 23, 7:53 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Sherman | 67 min |
| May 23, 8:12 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Graham, Greeley, Logan and 7 more | 5 hr |
| May 23, 9:56 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Logan, Rawlins, Sheridan, Sherman and 2 more | 2 hr |
| May 24, 1:00 PM CDT | Mesoscale Discussion | SPC | Finney, Gove, Grant, Gray, Greeley, Hamilton and 12 more | 2 hr |
| May 24, 1:29 PM CDT | Tornado Watch | SPC | Cheyenne, Decatur, Finney, Gove, Graham, Grant and 18 more | 9 hr |
| May 24, 3:42 PM CDT | Mesoscale Discussion | SPC | Gove, Logan, Rawlins, Sheridan, Thomas | 63 min |
| May 24, 5:37 PM CDT | Mesoscale Discussion | SPC | Decatur, Finney, Gove, Grant, Hamilton, Kearny and 7 more | 113 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.