Alert archive / Kansas / Mesoscale Discussions in 2021
Mesoscale Discussion 1151
The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2021, 6:56 PM CDT for 14 counties in Kansas; Beaver County, Texas County, Oklahoma. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2021, 6:56 PM CDT (23:56 UTC)
- Expired
- Jul 4, 2021, 8:30 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 334
Counties Grant County, KS, Greeley County, KS, Hamilton County, KS, Haskell County, KS, Kearny County, KS, Logan County, KS, Morton County, KS, Seward County, KS, Sherman County, KS, Stanton County, KS, Stevens County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Beaver County, OK, Texas County, OK
The radar
The Dodge City radar (KDDC), 143 km from the middle of the area, began a volume at 23:57 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 11.9 hours before the alert went out and 274 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
- 997 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 825 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.3
The text
As transmitted.
958
ACUS11 KWNS 042357
SWOMCD
SPC MCD 042356
OKZ000-KSZ000-COZ000-050130-
Mesoscale Discussion 1151
NWS Storm Prediction Center Norman OK
0656 PM CDT Sun Jul 04 2021
Areas affected...Western Kansas and adjacent portions of eastern
Colorado and the Oklahoma Panhandle
Concerning...Severe Thunderstorm Watch 334...
Valid 042356Z - 050130Z
The severe weather threat for Severe Thunderstorm Watch 334
continues.
SUMMARY...Widely scattered strong to severe storm development
remains possible into the 8-10 PM CDT time frame.
DISCUSSION...A zone of enhanced low-level convergence east-southeast
of a weak surface low over southeastern Colorado has become a recent
focus for increasing thunderstorm development. Otherwise, outflow
advancing westward from earlier storm development to the north, into
the more strongly heated environment over the higher plains, may
also remain a focus for widely scattered new storm development into
early evening.
With a belt of 20 kt north-northwesterly flow to the west of digging
weak mid-level troughing contributing to moderately strong
deep-layer shear, isolated supercells posing a risk for severe hail
and locally strong surface gusts remain possible another couple of
hours. By 02-03Z, increasing inhibition associated with diurnal
boundary-layer cooling may begin to result in weakening convective
trends.
..Kerr.. 07/04/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DDC...GLD...AMA...PUB...
LAT...LON 36960225 37690238 38210240 39400202 39720100 37750086
36880014 36560094 36770166 36960225SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 3:16 PM CDT | Mesoscale Discussion | SPC | Finney, Ford, Gove, Grant, Gray, Haskell and 13 more | 89 min |
| Jul 4, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Finney, Ford, Gove, Graham, Grant and 21 more | 7 hr |
| Jul 4, 2:36 PM CDT | Mesoscale Discussion | SPC | Cimarron | 114 min |
| Jul 4, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Cimarron, Texas | 7 hr |
Nearby
Mesoscale Discussions in Kansas, 2021Mesoscale Discussions in Oklahoma, 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.