Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 972
The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2017, 9:38 PM CDT for 16 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Jun 8, 2017, 9:38 PM CDT (02:38 UTC)
- Expired
- Jun 8, 2017, 10:45 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
Counties Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Castro County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Donley County, TX, Floyd County, TX, Hale County, TX, Hall County, TX, Lamb County, TX, Motley County, TX, Parmer County, TX, Randall County, TX, Swisher County, TX
The radar
The Amarillo radar (KAMA), 78 km from the middle of the area, began a volume at 02:41 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 2.6 hours before the alert went out and 77 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
- 339 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 2782 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
415 ACUS11 KWNS 090238 SWOMCD SPC MCD 090238 TXZ000-090345- Mesoscale Discussion 0972 NWS Storm Prediction Center Norman OK 0938 PM CDT Thu Jun 08 2017 Areas affected...Portions of the TX Panhandle into west TX Concerning...Severe Thunderstorm Watch 308... Valid 090238Z - 090345Z The severe weather threat for Severe Thunderstorm Watch 308 continues. SUMMARY...A severe supercell thunderstorm moving southward across Randall County TX remains the primary threat for large hail and damaging winds across WW 308. DISCUSSION...A long-lived supercell with a history of producing 1-2+ inch hail and 60-70 mph measured wind gusts across Amarillo TX and vicinity continues southward across Randall and towards Swisher County TX as of 0230Z. An arcing line of thunderstorms has formed east of this supercell across the TX Panhandle within a narrow corridor of greater low-level moisture per latest surface observations. This line of convection may also pose an isolated damaging wind/large hail threat as it moves south of the TX Panhandle over the next several hours. The airmass to the south of ongoing activity remains favorable for maintenance of thunderstorm updraft intensity and organization in the short term, with MLCAPE generally ranging 500-1500 J/kg, and effective bulk shear values of 35-45 kt. Over the next few hours, the loss of diurnal heating should weaken instability and increase convective inhibition, with a slow weakening trend in convection expected through late evening. ..Gleason.. 06/09/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LUB...AMA... LAT...LON 34590302 33860300 33860009 35190004 35170189 34590302
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 7:04 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 22 more | 56 min |
| Jun 8, 7:18 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 24 more | 5 hr |
| Jun 9, 4:58 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Comal, Edwards, Gillespie and 10 more | 3 hr |
Nearby
Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017
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.