Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 2242
The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2011, 7:53 AM CDT for 24 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2011, 7:53 AM CDT (12:53 UTC)
- Expired
- Oct 9, 2011, 11:00 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Austin County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Calhoun County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Goliad County, TX, Grimes County, TX, Harris County, TX, Jackson County, TX, Lavaca County, TX, Lee County, TX, Matagorda County, TX, Milam County, TX, Montgomery County, TX, Refugio County, TX, Robertson County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 117 km from the middle of the area, began a volume at 12:53 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, 0.9 hours before the alert went out and 251 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
- 2278 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 766 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
021
ACUS11 KWNS 091254
SWOMCD
SPC MCD 091253
TXZ000-091600-
MESOSCALE DISCUSSION 2242
NWS STORM PREDICTION CENTER NORMAN OK
0753 AM CDT SUN OCT 09 2011
AREAS AFFECTED...ECNTRL AND SE TX
CONCERNING...HEAVY RAINFALL
VALID 091253Z - 091600Z
HEAVY RAINFALL WILL CONTINUE TO BE POSSIBLE WITHIN THE STRONGER
CELLS EMBEDDED IN A LINE MOVING INTO SE TX. RAINFALL RATES OF 1 INCH
PER HOUR MAY OCCUR AS THE LINE PASSES SLOWLY FROM WEST TO EAST THIS
MORNING.
A LINE OF STRONG THUNDERSTORMS ALONG THE TX COASTAL PLAIN IS LOCATED
ON THE NRN END OF AN AXIS OF VERY MOIST AIR WITH SFC DEWPOINTS NEAR
70 F. THE LINE IS LOCATED NEAR A MAXIMUM IN PRECIPITABLE WATER
VALUES WITH MESOANALYSIS SUGGESTING PW VALUES ARE ABOVE 1.75 INCHES
ACROSS MOST OF THE MIDDLE TX COASTAL PLAIN FROM HOUSTON SWWD TO
CORPUS CHRISTI. THIS ALONG WITH A SLOW EWD MOVEMENT AROUND 20 KT
SHOULD BE FAVORABLE FOR HEAVY RAINFALL WITH 1 INCH PER HOUR RATES
POSSIBLE WITH THE MORE INTENSE CORES. THE SRN END OF THE LINE IS
NEAR THE STRONGEST INSTABILITY AND MAY BE FAVORED WITH THE GREATEST
HEAVY RAINFALL THREAT.
..BROYLES.. 10/09/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...HGX...FWD...CRP...EWX...
LAT...LON 30209501 30579544 30959599 31289670 31179729 30819736
30429724 29489743 28519768 28109739 28119700 28369643
29009558 29399496 29699478 29929479 30209501SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 11:32 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Bosque, Brown, Burnet, Comanche and 25 more | 2 hr |
| Oct 9, 2:40 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bee, Bexar, Blanco, Burnet, Caldwell and 21 more | 3 hr |
Nearby
Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
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.