Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 555
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2012, 6:29 PM CDT for Refugio County, San Patricio County, Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2012, 6:29 PM CDT (23:29 UTC)
- Expired
- Apr 15, 2012, 8:00 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
Counties Refugio County, TX, San Patricio County, TX
The radar
The Corpus Christi radar (KCRP), 55 km from the middle of the area, began a volume at 23:29 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, 11.5 hours before the alert went out and 61 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
- 1700 J/kg
- Mixed-layer CIN
- -292 J/kg
- Mixed-layer LCL
- 780 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 224 m²/s²
- 0-3 km storm-relative helicity
- 447 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
845
ACUS11 KWNS 152329
SWOMCD
SPC MCD 152329
TXZ000-160100-
MESOSCALE DISCUSSION 0555
NWS STORM PREDICTION CENTER NORMAN OK
0629 PM CDT SUN APR 15 2012
AREAS AFFECTED...PORTIONS OF MIDDLE TEXAS COASTAL AREAS AND ADJACENT
COASTAL PLAIN
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 152329Z - 160100Z
THE NEED FOR A WATCH IS NOT CURRENTLY ANTICIPATED...BUT TRENDS WILL
CONTINUE TO BE MONITORED FOR THE POSSIBILITY OF AN INCREASING SEVERE
THREAT.
LOCALLY ENHANCED CONVERGENCE ASSOCIATED WITH THE INTERSECTION OF AN
INLAND ADVANCING SEA-BREEZE AND SOUTHEASTWARD ADVANCING WEAK COLD
FRONT APPEARS TO HAVE BEEN THE INITIATING MECHANISM FOR ISOLATED
INTENSE CONVECTIVE DEVELOPMENT TO THE SOUTHWEST OF VICTORIA. THIS
IS BEING SUPPORTED BY FAIRLY LARGE CAPE OF 2000-3000+ J/KG...IN THE
PRESENCE OF HIGH BOUNDARY LAYER MOISTURE AND STEEP MID-LEVEL LAPSE
RATES. DEEP LAYER SHEAR BENEATH 30-50 KT SOUTHERLY 500 MB FLOW IS
AT LEAST MARGINALLY SUFFICIENT FOR SUBSTANTIVE MID-LEVEL UPDRAFT
ROTATION. AIDED BY A FOCUSED AREA OF ENHANCED LOWER/MID
TROPOSPHERIC WARM ADVECTION...ACTIVITY MAY PERSIST AT LEAST ANOTHER
SEVERAL HOURS. IT IS NOT CLEAR THAT A SUBSTANTIAL INCREASE IN
COVERAGE WILL OCCUR...BUT THE RISK FOR LARGE HAIL COULD
CONTINUE...ALONG WITH SOME POTENTIAL FOR AN ISOLATED
TORNADO...PERHAPS EVENTUALLY A LOCALIZED STRONG DOWNBURST...MAINLY
WEST/NORTHWEST OF CORPUS CHRISTI THROUGH 00-02Z.
..KERR.. 04/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CRP...
LAT...LON 28159774 28559756 28759725 28589692 28129706 27899744
27969772 28159774SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 10:11 PM CDT | Mesoscale Discussion | SPC | Borden, Childress, Collingsworth, Cottle, Crosby, Dawson and 17 more | 34 min |
| Apr 14, 10:29 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Archer, Baylor, Borden, Briscoe, Callahan and 43 more | 6 hr |
| Apr 15, 9:25 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Delta, Franklin, Gregg and 10 more | 95 min |
| Apr 15, 3:44 PM CDT | Mesoscale Discussion | SPC | Panola, Shelby | 91 min |
Nearby
Mesoscale Discussions in Texas, 2012Every mesoscale discussion in 2012
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.