Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 633
The Storm Prediction Center issued this mesoscale discussion at May 13, 2015, 12:49 PM CDT for 25 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 13, 2015, 12:49 PM CDT (17:49 UTC)
- Expired
- May 13, 2015, 3:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 25 counties
Borden County, TX, Coke County, TX, Concho County, TX, Crockett County, TX, Dawson County, TX, Fisher County, TX, Garza County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Scurry County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Val Verde County, TX
The radar
The San Angelo radar (KSJT), 83 km from the middle of the area, began a volume at 17:51 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
Midland Regional, TX (KMAF), launched 12:00Z, 5.8 hours before the alert went out and 105 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
- 3 J/kg
- Mixed-layer CIN
- -135 J/kg
- Mixed-layer LCL
- 972 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 7:34 AM CDT | Mesoscale Discussion | SPC | Bandera, Dimmit, Frio, La Salle, Medina, Real and 2 more | 56 min |
| May 13, 9:52 AM CDT | Tornado Watch | SPC | Atascosa, Bastrop, Bee, Bexar, Blanco, Burnet and 27 more | 8 hr |
| May 13, 11:43 AM CDT | Mesoscale Discussion | SPC | Bee, Duval, Live Oak | 2 hr |
| May 13, 2:24 PM CDT | Mesoscale Discussion | SPC | Anderson, Cherokee, Freestone, Grimes, Henderson, Houston and 8 more | 3 hr |
| May 13, 3:09 PM CDT | Severe Thunderstorm Watch | SPC | Coke, Concho, Crockett, Dimmit, Edwards, Irion and 16 more | 7 hr |
| May 13, 3:37 PM CDT | Mesoscale Discussion | SPC | Briscoe, Childress, Collingsworth, Cottle, Dickens, Donley and 9 more | 2 hr |
| May 13, 6:46 PM CDT | Mesoscale Discussion | SPC | Coke, Coleman, Concho, Crockett, Edwards, Irion and 14 more | 89 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.