Alert archive / Texas / Mesoscale Discussions in 2018
Mesoscale Discussion 404
The Storm Prediction Center issued this mesoscale discussion at May 13, 2018, 7:14 PM CDT for 13 counties in Kansas; 12 counties in Oklahoma; 20 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- May 13, 2018, 7:14 PM CDT (00:14 UTC)
- Expired
- May 13, 2018, 8:45 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 45 counties
Barber County, KS, Barton County, KS, Clark County, KS, Comanche County, KS, Edwards County, KS, Ford County, KS, Hodgeman County, KS, Kiowa County, KS, Meade County, KS, Pawnee County, KS, Pratt County, KS, Rush County, KS, Stafford County, KS, Beaver County, OK, Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX
The radar
The Altus AFB radar (KFDR), 160 km from the middle of the area, began a volume at 00:15 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 00:00Z, 0.2 hours before the alert went out and 169 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
- 3885 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
606
ACUS11 KWNS 140014
SWOMCD
SPC MCD 140014
OKZ000-KSZ000-TXZ000-140145-
Mesoscale Discussion 0404
NWS Storm Prediction Center Norman OK
0714 PM CDT Sun May 13 2018
Areas affected...Southwest KS...Western OK...Northwest TX...Eastern
TX/OK Panhandles
Concerning...Severe Thunderstorm Watch 87...
Valid 140014Z - 140145Z
The severe weather threat for Severe Thunderstorm Watch 87
continues.
SUMMARY...A gradual weakening trend is expected with ongoing storms
this evening, though some hail/wind risk will continue in the short
term.
DISCUSSION...At 00Z, intense thunderstorms are ongoing from
southwest KS into the TX Panhandle, generally along and east of a
northwestward-retreating surface boundary. A gradual decreasing
trend has been noted with many of cells over the past hour, and a
general decreasing trend is expected to continue into the evening as
surface-based CINH increases. However, strong instability and
sufficient effective shear will continue to support a hail/wind
threat for at least the next 1-2 hours, especially across the
eastern TX Panhandle where several cell mergers are ongoing, and
also across southwest KS in the vicinity of the surface boundary.
Isolated instances of very large hail remain possible in the short
term given the magnitude of instability.
Later tonight, an increasing low-level jet will support development
of elevated convection to the north of the surface boundary. Some
hail risk may accompany this activity, though any such risk would
likely remain north of areas currently in WW 87.
..Dean.. 05/14/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...ICT...OUN...DDC...LUB...AMA...
LAT...LON 33450151 35910113 38090012 38529960 38589859 37409857
35889882 34599937 34149961 33589965 33450023 33450151SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 8:00 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Clay, Cloud, Dickinson, Doniphan and 22 more | 3 hr |
| May 14, 12:54 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Butler, Chase, Coffey and 13 more | 96 min |
| May 14, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 28 more | 11 hr |
| May 14, 5:04 PM CDT | Mesoscale Discussion | SPC | Logan, Sherman, Wallace | 116 min |
| May 14, 3:10 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Custer, Dewey, Garfield and 10 more | 2 hr |
| May 14, 4:39 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 16 more | 6 hr |
| May 14, 2:32 PM CDT | Mesoscale Discussion | SPC | Baylor, Coke, Cottle, Crockett, Dickens, Fisher and 21 more | 88 min |
Nearby
Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Kansas, 2018Mesoscale Discussions in Oklahoma, 2018Every mesoscale discussion in 2018
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.