Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 366
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2015, 6:40 PM CDT for 54 counties in Texas. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2015, 6:40 PM CDT (23:40 UTC)
- Expired
- Apr 18, 2015, 8:15 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 54 counties
Bandera County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Edwards County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Freestone County, TX, Gillespie County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Johnson County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Mills County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Real County, TX, Rockwall County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Somervell County, TX, Stephens County, TX, Sutton County, TX, Tarrant County, TX, Taylor County, TX, Tom Green County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX
The radar
The San Angelo radar (KSJT), 144 km from the middle of the area, began a volume at 23:39 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, 11.7 hours before the alert went out and 253 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
- 668 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 705 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -48 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
The text
As transmitted, in the capitals the NWS used until 2016.
047
ACUS11 KWNS 182340
SWOMCD
SPC MCD 182340
TXZ000-190115-
MESOSCALE DISCUSSION 0366
NWS STORM PREDICTION CENTER NORMAN OK
0640 PM CDT SAT APR 18 2015
AREAS AFFECTED...PORTIONS OF TEXAS
CONCERNING...SEVERE THUNDERSTORM WATCH 72...76...
VALID 182340Z - 190115Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
72...76...CONTINUES.
SUMMARY...AN EVOLVING MESOSCALE CONVECTIVE SYSTEM WILL CONTINUE
SPREADING EWD ACROSS PORTIONS OF CNTRL TX...WITH DMGG WIND GUSTS AND
SVR HAIL EXPECTED.
DISCUSSION...CONVECTION HAS CONGEALED INTO A FORWARD-PROPAGATING MCS
ACROSS PARTS OF CNTRL TX AND WILL CONTINUE SPREADING EWD TOWARD THE
INTERSTATE 35 CORRIDOR INCLUDING THE DFW METROPLEX AND WACO. STEEP
TROPOSPHERIC LAPSE RATES SUPPORTING 1500-2000 J/KG OF MLCAPE COUPLED
WITH 30-45 KT OF DEEP SHEAR ORIENTED LARGELY ORTHOGONAL TO THE
LEADING CONVECTIVE LINE WILL CONTINUE TO SUPPORT SVR WIND/HAIL. THE
LARGE HAIL POTENTIAL MAY BE SOMEWHAT GREATER WITH TRAILING SUPERCELL
STRUCTURES ON THE SRN FLANK OF THE EVOLVING COLD POOL AND FARTHER S
WITH MORE DISCRETE CONVECTION ACROSS PARTS OF THE EDWARDS PLATEAU
AND TX HILL COUNTRY. IN THE WAKE OF CONVECTIVELY STABILIZED
AIR...PROSPECTS FOR ADDITIONAL SFC-BASED CONVECTIVE DEVELOPMENT MAY
BE RELATIVELY LOW OWING TO INCREASED MLCINH -- NOCTURNALLY ENHANCED.
..COHEN.. 04/18/2015
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...EWX...SJT...
LAT...LON 29940144 32440015 33629633 31729605 30299787 29249995
29940144SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 7:26 PM CDT | Mesoscale Discussion | SPC | Carson, Hansford, Hutchinson, Ochiltree, Roberts | 2 hr |
| Apr 17, 7:39 PM CDT | Mesoscale Discussion | SPC | Chambers, Galveston, Jefferson | 96 min |
| Apr 17, 9:10 PM CDT | Mesoscale Discussion | SPC | Aransas, Brooks, Calhoun, Duval, Hidalgo, Jim Hogg and 7 more | 95 min |
| Apr 17, 9:13 PM CDT | Severe Thunderstorm Watch | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 4 more | 5 hr |
| Apr 17, 10:59 PM CDT | Mesoscale Discussion | SPC | Aransas, Brooks, Hidalgo, Kenedy, Kleberg, Nueces | 91 min |
| Apr 17, 11:31 PM CDT | Mesoscale Discussion | SPC | Chambers, Galveston, Jefferson, Orange | 59 min |
| Apr 18, 1:52 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 23 more | 113 min |
| Apr 18, 2:13 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bastrop, Bexar, Blanco, Bosque, Brown and 58 more | 8 hr |
| Apr 18, 2:27 PM CDT | Tornado Watch | SPC | Archer, Baylor, Childress, Clay, Collingsworth, Cottle and 9 more | 6 hr |
| Apr 18, 4:32 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bexar, Caldwell, Comal, Dimmit and 11 more | 2 hr |
| Apr 18, 4:48 PM CDT | Mesoscale Discussion | SPC | Hidalgo, Kenedy, Kleberg, Willacy | 2 hr |
| Apr 18, 5:23 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Ellis, Falls, Hill, Kaufman and 6 more | 3 hr |
| Apr 18, 5:46 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Collin, Cooke, Dallas, Denton and 20 more | 5 hr |
| Apr 18, 6:03 PM CDT | Mesoscale Discussion | SPC | Baylor, Childress, Collingsworth, Cottle, Foard, Hardeman and 3 more | 87 min |
Nearby
Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015
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.