Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 795
The Storm Prediction Center issued this mesoscale discussion at May 19, 2017, 11:05 PM CDT for 20 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2017, 11:05 PM CDT (04:05 UTC)
- Expired
- May 20, 2017, 1:00 AM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
Counties Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Eastland County, TX, Irion County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Nolan County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Stephens County, TX, Sutton County, TX, Taylor County, TX, Tom Green County, TX
The radar
The San Angelo radar (KSJT), 49 km from the middle of the area, began a volume at 04:07 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
Midland Regional, TX (KMAF), launched 00:00Z, 4.1 hours before the alert went out and 222 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3843 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
518
ACUS11 KWNS 200406
SWOMCD
SPC MCD 200405
TXZ000-200600-
Mesoscale Discussion 0795
NWS Storm Prediction Center Norman OK
1105 PM CDT Fri May 19 2017
Areas affected...central Texas
Concerning...Tornado Watch 251...
Valid 200405Z - 200600Z
The severe weather threat for Tornado Watch 251 continues.
SUMMARY...Local severe/brief tornado risk continues with storms
ongoing across southern parts of WW 251 at this time. Additional
storm development possible overnight.
DISCUSSION...Latest radar loop shows a band of strong/severe storms
over southern portions of watch 251 at this time, with risk for
primarily large hail indicated presently.
Latest CAM runs continue to suggest possible storm development near
the cold front, now moving across northwestern portions of the
watch. Much of this activity may reside to the cool side of the
front however, which would suggest hail would be the primary risk
with any new storm development. Meanwhile, possibility for locally
damaging winds or an isolated/brief tornado may persist for a couple
more hours with aforementioned activity in the southern portion of
the ww.
..Goss.. 05/20/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FWD...EWX...SJT...MAF...
LAT...LON 30520092 31310121 32510057 32779881 31239825 30479914
30520092SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:15 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Concho, Fisher and 11 more | 60 min |
| May 19, 7:44 PM CDT | Tornado Watch | SPC | Brown, Callahan, Coke, Coleman, Concho, Fisher and 15 more | 7 hr |
| May 20, 7:41 AM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bandera, Bee, Bexar, Caldwell and 21 more | 94 min |
| May 20, 10:15 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bee, Bexar, DeWitt, Dimmit, Duval and 18 more | 11 hr |
| May 20, 12:56 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bee, Bexar, DeWitt, Dimmit, Frio and 13 more | 94 min |
| May 20, 3:46 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bee, Bexar, DeWitt, Dimmit, Duval and 19 more | 59 min |
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.