Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 948
The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2017, 5:14 PM CDT for 11 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 4, 2017, 5:14 PM CDT (22:14 UTC)
- Expired
- Jun 4, 2017, 7:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
Counties Aransas County, TX, Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Nueces County, TX, San Patricio County, TX, Willacy County, TX
The radar
The Corpus Christi radar (KCRP), 78 km from the middle of the area, began a volume at 22:16 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
Corpus Christi, TX (KCRP), launched 12:00Z, 10.2 hours before the alert went out and 78 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
- 1740 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 863 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
360
ACUS11 KWNS 042214
SWOMCD
SPC MCD 042214
TXZ000-050015-
Mesoscale Discussion 0948
NWS Storm Prediction Center Norman OK
0514 PM CDT Sun Jun 04 2017
Areas affected...Portions of south Texas
Concerning...Severe potential...Watch unlikely
Valid 042214Z - 050015Z
Probability of Watch Issuance...5 percent
SUMMARY...Isolated strong/severe storms will be possible through
early evening with a risk for damaging winds and perhaps hail. A
watch is not anticipated due to the localized nature of the threat.
DISCUSSION...Thunderstorms were noted in regional radar composite
imagery over south Texas this afternoon in the vicinity of a sea
breeze boundary, likely augmented by weak ascent with a subtle
mid-level impulse. A severe thunderstorm over southern Kennedy
county was propagating south near the sea breeze boundary.
Temperatures in the 90s and dew points mostly in the 70s have
yielded moderate surface-based buoyancy. Light southeast/south
low-level flow beneath weak westerlies aloft have resulted in 35-40
kts of westerly effective bulk shear. The more intense storms will
pose a risk for damaging winds as water loading within a high PW
environment drives strong downdrafts. Additional storm development
is expected along the sea breeze and resulting from outflow boundary
interactions.
..Bunting/Thompson.. 06/04/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CRP...BRO...
LAT...LON 26789741 26299725 25979727 25909742 26069767 26129807
26299835 26809865 27339866 27799853 28169833 28309786
28349730 28269693 27969696 27509726 27269734 26789741Nearby
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.