Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 430
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2015, 2:36 AM CDT for 5 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2015, 2:36 AM CDT (07:36 UTC)
- Expired
- Apr 24, 2015, 4:00 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
Counties Dimmit County, TX, La Salle County, TX, McMullen County, TX, Webb County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 113 km from the middle of the area, began a volume at 07:36 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Del Rio, TX (KDLF), launched 00:00Z, 7.6 hours before the alert went out and 156 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
- 1325 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1694 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 214 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
629 ACUS11 KWNS 240736 SWOMCD SPC MCD 240736 TXZ000-240900- MESOSCALE DISCUSSION 0430 NWS STORM PREDICTION CENTER NORMAN OK 0236 AM CDT FRI APR 24 2015 AREAS AFFECTED...MIDDLE RIO GRANDE VALLEY/SOUTH-CENTRAL TX CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 240736Z - 240900Z PROBABILITY OF WATCH ISSUANCE...60 PERCENT SUMMARY...A SUPERCELL OR TWO MAY MAY POSE MOSTLY A LARGE HAIL AND POSSIBLY SOME TORNADO/DAMAGING WIND RISK ACROSS PARTS OF THE MIDDLE RIO GRANDE VALLEY AND POSSIBLY ADDITIONAL PARTS OF SOUTH-CENTRAL TX OVERNIGHT. A WATCH MAY BE NEEDED. DISCUSSION...A SUPERCELL IS CURRENTLY CROSSING THE MIDDLE RIO GRANDE RIVER INTO SOUTHERN MAVERICK COUNTY TX. THE REGION APPEARS TO BE AT LEAST SOMEWHAT INFLUENCED BY WEAK HEIGHT FALLS VIA AN UPSTREAM TROUGH OVER NORTHERN MEXICO. THE ENVIRONMENT ACROSS THE MIDDLE RIO GRANDE VALLEY/SOUTH-CENTRAL TX IS VERY MOIST/MODERATELY UNSTABLE IN THE PRESENCE OF LOWER 70S F SURFACE DEWPOINTS AND PRECIPITABLE WATER VALUES THAT ARE LIKELY IN EXCESS OF 1.5 INCHES. ACCENTUATED BY LIGHT EASTERLY WINDS IN THE BOUNDARY LAYER...STRONG DEEP-LAYER/LOW-LEVEL SHEAR WILL BE SUPPORTIVE OF SUPERCELLS CAPABLE OF LARGE HAIL ALONG WITH SOME TORNADO/DAMAGING WIND RISK. ..GUYER/CORFIDI.. 04/24/2015 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CRP...EWX... LAT...LON 28620046 29029957 28309844 27449949 28620046
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 9:34 PM CDT | Mesoscale Discussion | SPC | Bandera, Dimmit, Edwards, Frio, Jim Hogg, Kinney and 10 more | 56 min |
| Apr 24, 3:01 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Dimmit, Frio, La Salle, Live Oak, McMullen and 5 more | 4 hr |
| Apr 24, 5:41 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Dimmit, Duval, Edwards, Frio and 10 more | 94 min |
| Apr 24, 10:29 AM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Liberty, Newton, Orange, Tyler | 91 min |
| Apr 24, 11:12 AM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coke, Coleman, Collin and 43 more | 2 hr |
| Apr 24, 11:53 AM CDT | Mesoscale Discussion | SPC | Hardin, Jefferson, Newton, Orange | 97 min |
| Apr 24, 12:18 PM CDT | Tornado Watch | SPC | Jasper, Newton, Orange | 5 hr |
| Apr 24, 12:56 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Crosby, Dickens, Foard and 3 more | 94 min |
| Apr 24, 2:10 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bosque, Brown, Callahan, Coke and 52 more | 8 hr |
| Apr 24, 3:58 PM CDT | Mesoscale Discussion | SPC | Angelina, Camp, Cass, Cherokee, Gregg, Harrison and 16 more | 92 min |
| Apr 24, 4:45 PM CDT | Tornado Watch | SPC | Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 20 more | 5 hr |
| Apr 24, 4:56 PM CDT | Mesoscale Discussion | SPC | Atascosa, Dimmit, Duval, Frio, Jim Hogg, Kinney and 9 more | 94 min |
| Apr 24, 6:01 PM CDT | Mesoscale Discussion | SPC | Dallas, Ellis, Erath, Hood, Johnson, Kaufman and 3 more | 59 min |
| Apr 24, 6:53 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bee, Brooks, Cameron, DeWitt, Dimmit and 19 more | 6 hr |
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.