Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 907
The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 6:03 PM CDT for 46 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2017, 6:03 PM CDT (23:03 UTC)
- Expired
- May 28, 2017, 7:00 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 46 counties
Anderson County, TX, Bandera County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Coryell County, TX, Dimmit County, TX, Edwards County, TX, Falls County, TX, Freestone County, TX, Frio County, TX, Gillespie County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Henderson County, TX, Houston County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, Maverick County, TX, McLennan County, TX, Medina County, TX, Milam County, TX, Navarro County, TX, Real County, TX, Robertson County, TX, Travis County, TX, Trinity County, TX, Uvalde County, TX, Walker County, TX, Washington County, TX, Williamson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 82 km from the middle of the area, began a volume at 23:03 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
Del Rio, TX (KDLF), launched 12:00Z, 11.1 hours before the alert went out and 225 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
- 3017 J/kg
- Mixed-layer CIN
- -339 J/kg
- Mixed-layer LCL
- 1097 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
575 ACUS11 KWNS 282303 SWOMCD SPC MCD 282303 TXZ000-290000- Mesoscale Discussion 0907 NWS Storm Prediction Center Norman OK 0603 PM CDT Sun May 28 2017 Areas affected...TX Concerning...Severe Thunderstorm Watch 293... Valid 282303Z - 290000Z The severe weather threat for Severe Thunderstorm Watch 293 continues. SUMMARY...Strong/severe thunderstorms will continue across WW293. DISCUSSION...An elongated corridor of robust convection persists from near DRT-25N AUS-TYR. This activity has evolved along a pronounced cold front that should gradually sag southward over the next few hours. In addition, water vapor imagery suggests an upper shortwave-trough is oriented southwest-northeast along this axis of convection and as this trough shifts east veering deep-layer flow in its wake should encourage storms across south-central TX to propagate south. Large hail is the primary risk with this activity. ..Darrow.. 05/28/2017 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...HGX...FWD...CRP...EWX...SJT... LAT...LON 29670115 32439593 30909501 28120024 29670115
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:12 PM CDT | Mesoscale Discussion | SPC | Dallam, Hansford, Hartley, Ochiltree, Sherman | 2 hr |
| May 27, 9:07 PM CDT | Mesoscale Discussion | SPC | Hansford, Hemphill, Hutchinson, Lipscomb, Ochiltree, Roberts and 1 more | 53 min |
| May 27, 11:47 PM CDT | Mesoscale Discussion | SPC | Clay, Cooke, Fannin, Grayson, Lamar, Montague and 1 more | 58 min |
| May 28, 12:06 AM CDT | Severe Thunderstorm Watch | SPC | Bowie, Collin, Cooke, Denton, Fannin, Grayson and 4 more | 5 hr |
| May 28, 2:53 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Delta and 16 more | 2 hr |
| May 28, 4:59 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Delta, Denton and 7 more | 2 hr |
| May 28, 1:34 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Bexar, Blanco, Burnet, Caldwell and 18 more | 56 min |
| May 28, 3:09 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Atascosa, Austin, Bandera, Bastrop, Bell and 58 more | 8 hr |
| May 28, 5:01 PM CDT | Mesoscale Discussion | SPC | Gregg, Harrison, Marion, Nacogdoches, Panola, Rusk and 1 more | 59 min |
| May 28, 5:19 PM CDT | Severe Thunderstorm Watch | SPC | Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 6 more | 4 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.