Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 447
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2012, 3:32 PM CDT for 7 counties in Texas. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2012, 3:32 PM CDT (20:32 UTC)
- Expired
- Apr 4, 2012, 5:00 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
Counties Aransas County, TX, Brazoria County, TX, Calhoun County, TX, Galveston County, TX, Kleberg County, TX, Matagorda County, TX, Nueces County, TX
The radar
The Corpus Christi radar (KCRP), 153 km from the middle of the area, began a volume at 20:32 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, 8.5 hours before the alert went out and 142 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
- 3692 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 499 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- -0.5
- Supercell composite
- -3.1
The text
As transmitted, in the capitals the NWS used until 2016.
177
ACUS11 KWNS 042032
SWOMCD
SPC MCD 042032
TXZ000-042200-
MESOSCALE DISCUSSION 0447
NWS STORM PREDICTION CENTER NORMAN OK
0332 PM CDT WED APR 04 2012
AREAS AFFECTED...MIDDLE AND SRN TX COAST
CONCERNING...SEVERE THUNDERSTORM WATCH 139...
VALID 042032Z - 042200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 139
CONTINUES.
SEVERE THREAT CONTINUES INVOF THE TX COAST/WITHIN WW 139.
LATEST RADAR IMAGERY SHOWS STORMS CONTINUING INVOF A SEA-BREEZE
BOUNDARY LOCATED JUST INLAND FROM THE TX COAST. SEVERAL STORMS HAVE
BEEN SUPERCELLULAR OVER THE PAST 1-2 HOURS -- PARTICULARLY ACROSS
NRN-MOST PORTIONS OF THE AREA...WHERE SLIGHTLY STRONGER FLOW ALOFT
IS INDICATED.
GIVEN THE VERY MOIST/UNSTABLE ENVIRONMENT AND SHEAR SUFFICIENT FOR
SUPERCELLS...EXPECT THREAT FOR HAIL AND LOCALLY DAMAGING WINDS TO
CONTINUE. IN ADDITION...WITH FAIRLY SLOW STORM MOVEMENT AND
CONVECTIVE CELLS MOVING REPEATEDLY OVER SOME OF THE SAME
AREAS...LOCALLY HEAVY RAINFALL WILL ALSO OCCUR.
..GOSS.. 04/04/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...HGX...CRP...BRO...
LAT...LON 29649506 29269475 28549532 27119707 27029791 27169825
29479592 29649506SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Bastrop, Brazos, Burleson, Colorado, Fayette and 13 more | 7 hr |
| Apr 3, 8:47 PM CDT | Mesoscale Discussion | SPC | Angelina, Cherokee, Houston, Nacogdoches, Panola, Rusk and 3 more | 58 min |
| Apr 3, 9:48 PM CDT | Severe Thunderstorm Watch | SPC | Angelina, Cherokee, Hardin, Jasper, Jefferson, Nacogdoches and 8 more | 8 hr |
| Apr 3, 11:24 PM CDT | Mesoscale Discussion | SPC | Angelina, Austin, Colorado, Jasper, Lavaca, Montgomery and 10 more | 96 min |
| Apr 4, 2:29 AM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Harris, Jefferson, Liberty, Orange and 2 more | 91 min |
| Apr 4, 12:19 PM CDT | Mesoscale Discussion | SPC | Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 25 more | 86 min |
| Apr 4, 12:55 PM CDT | Severe Thunderstorm Watch | SPC | Aransas, Bee, Brazoria, Brooks, Calhoun, Cameron and 19 more | 6 hr |
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.