Alert archive / Texas / Mesoscale Discussions in 2016
Mesoscale Discussion 239
The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2016, 6:05 PM CDT for 29 counties in Texas. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2016, 6:05 PM CDT (23:05 UTC)
- Expired
- Mar 18, 2016, 7:00 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 29 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Dimmit County, TX, Edwards County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Llano County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 110 km from the middle of the area, began a volume at 23:06 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 171 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
- 2117 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 542 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted.
863 ACUS11 KWNS 182305 SWOMCD SPC MCD 182305 TXZ000-190000- MESOSCALE DISCUSSION 0239 NWS STORM PREDICTION CENTER NORMAN OK 0605 PM CDT FRI MAR 18 2016 AREAS AFFECTED...SOUTH CENTRAL TEXAS CONCERNING...SEVERE THUNDERSTORM WATCH 48... VALID 182305Z - 190000Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 48 CONTINUES. SUMMARY...TSTMS ARE EXPECTED TO EXPAND IN AREAL COVERAGE AS THEY PROPAGATE SOUTH ACROSS WW48. HAIL REMAINS THE GREATEST RISK. DISCUSSION...CONVECTION CONTINUES TO EXPAND IN AREAL COVERAGE ALONG SURGING COLD FRONT THAT HAS PROGRESSED TO THE BALCONES ESCARPMENT. DEEP-LAYER SHEAR IS ADEQUATE FOR MAINTENANCE OF SEVERE MULTI-CELL UPDRAFTS AND PERHAPS AN ISOLATED SUPERCELL. THIS ACTIVITY IS EXPECTED TO PROPAGATE SWD ACROSS THE REMAINDER OF WW48 OVER THE NEXT SEVERAL HOURS WHERE LAPSE RATES/INSTABILITY REMAIN FAVORABLE FOR STRONG UPDRAFTS. FARTHER WEST...CONSIDERABLE AMOUNT OF CONVECTION HAS EVOLVED OFF THE HIGHER TERRAIN OF NRN MEXICO...WEST OF THE RIO GRANDE RIVER. RADAR DATA SUGGESTS A WELL-DEFINED BOW-TYPE STRUCTURE HAS EVOLVED FROM THIS LARGER COMPLEX OF STORMS ROUGHLY 75MI SSW OF DRT. THIS ACTIVITY IS EXPECTED TO DRIVE SEWD TOWARD THE MIDDLE RIO GRANDE RIVER VALLEY LATER THIS EVENING ALONG A STRONG INSTABILITY AXIS WITH MUCAPE ON THE ORDER OF 4000 J/KG. THIS ACTIVITY WILL BE MONITORED CLOSELY. ..DARROW.. 03/18/2016 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...HGX...FWD...CRP...EWX...SJT... LAT...LON 27960014 29700096 31409748 29649667 27960014
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 6:04 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Collin, Cooke, Cottle and 10 more | 2 hr |
| Mar 18, 9:51 AM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Delta, Fannin, Franklin, Grayson and 4 more | 84 min |
| Mar 18, 1:16 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 4 more | 59 min |
| Mar 18, 1:35 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more | 6 hr |
| Mar 18, 1:57 PM CDT | Mesoscale Discussion | SPC | Bandera, Crockett, Edwards, Gillespie, Kendall, Kerr and 8 more | 2 hr |
| Mar 18, 3:47 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 13 more | 118 min |
| Mar 18, 4:09 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 31 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2016Every mesoscale discussion in 2016
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.