Alert archive / Texas / Mesoscale Discussions in 2006
Mesoscale Discussion 2321
The Storm Prediction Center issued this mesoscale discussion at Dec 29, 2006, 5:09 PM CST for Beauregard Parish, Calcasieu Parish, Louisiana; 81 counties in Texas. It was in force for 36 min.
The area
The outline as issued.
The facts
- Issued
- Dec 29, 2006, 5:09 PM CST (23:09 UTC)
- Expired
- Dec 29, 2006, 5:45 PM CST
- In force
- 36 min
- Issued by
- the Storm Prediction Center
All 83 counties
Beauregard Parish, LA, Calcasieu Parish, LA, Anderson County, TX, Angelina County, TX, Aransas County, TX, Austin County, TX, Bastrop County, TX, Bee County, TX, Bell County, TX, Bosque County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Calhoun County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, Comal County, TX, Coryell County, TX, DeWitt County, TX, Ellis County, TX, Falls County, TX, Fayette County, TX, Fort Bend County, TX, Freestone County, TX, Galveston County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hamilton County, TX, Hardin County, TX, Harris County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Houston County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Jim Wells County, TX, Johnson County, TX, Karnes County, TX, Kleberg County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Live Oak County, TX, Madison County, TX, Matagorda County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Nueces County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, San Patricio County, TX, Shelby County, TX, Somervell County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wilson County, TX
The radar
The Houston radar (KHGX), 124 km from the middle of the area, began a volume at 23:10 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.2 hours before the alert went out and 272 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
- 119 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 485 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 324 m²/s²
- 0-3 km storm-relative helicity
- 363 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 292309 SWOMCD SPC MCD 292309 LAZ000-TXZ000-292345- MESOSCALE DISCUSSION 2321 NWS STORM PREDICTION CENTER NORMAN OK 0509 PM CST FRI DEC 29 2006 AREAS AFFECTED...PARTS OF CENTRAL AND E TX INCLUDING COASTAL WATERS EWD TO SWRN LA CONCERNING...TORNADO WATCH 886... VALID 292309Z - 292345Z TORNADO THREAT EXPECTED TO DEVELOP EWD INTO SE AND PARTS OF E TX BY EARLY EVENING. THUS...NEW TORNADO WATCH BEING CONSIDERED FOR SE TX AND POTENTIALLY PARTS OF SW LA. THIS NEW WW WILL ALSO INCLUDE VALID PARTS OF WW 886 TO THE EAST OF COLD FRONT. LATE AFTERNOON SURFACE ANALYSIS INDICATED A TRIPLE POINT LOW OVER CENTRAL TX IN THE VICINITY OF BOSQUE COUNTY...WITH A WARM FRONT EXTENDING EWD INTO WEST CENTRAL LA. A SECOND WARM FRONT EXTENDED FROM THE NWRN GULF TO NEAR GLS AND THEN NWWD INTO ANDERSON COUNTY OR ABOUT 45 SSW TYR. STORMS DEVELOPING IN THE VICINITY OF THIS SECOND WARM FRONT ARE EXPECTED TO POSE A TORNADO THREAT...GIVEN THE CURRENT EXISTENCE OF STRONG LOW LEVEL DIRECTIONAL SHEAR WITH 0-1 KM SRH VALUES EXCEEDING 400 M2/S2. FURTHER INCREASE IN DEEP LAYER VEERING WIND PROFILE IS EXPECTED THROUGH THIS EVENING OVER AND EAST OF WW 886 INTO SW LA...RESULTING IN A CONTINUED POTENTIAL FOR SUPERCELLS AND ATTENDANT TORNADO THREAT. PERSISTENT MOISTURE INFLUX INTO THE WARM SECTOR WILL MAINTAIN AT LEAST MARGINAL INSTABILITY FOR THUNDERSTORMS TO CONTINUE TO DEVELOP THROUGH THE EVENING ALLOWING FOR LOW LCLS/LFCS AND ENHANCING TORNADO POTENTIAL. ..PETERS.. 12/29/2006 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...SHV...HGX...FWD...CRP...EWX... 31489346 30089320 29459351 29019462 28479532 27529690 27309772 27329838 28099827 29859830 30759827 31759816 32459816 32549673 32319544 32199460 31879408
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 29, 11:42 AM CST | Mesoscale Discussion | SPC | Austin, Bastrop, Bell, Blanco, Bosque, Brazos and 44 more | 3 hr |
| Dec 29, 12:42 PM CST | Tornado Watch | SPC | Anderson, Aransas, Atascosa, Austin, Bastrop, Bee and 67 more | 5 hr |
| Dec 29, 1:09 PM CST | Mesoscale Discussion | SPC | Archer, Clay, Collin, Cooke, Dallas, Delta and 22 more | 66 min |
| Dec 29, 1:37 PM CST | Tornado Watch | SPC | Archer, Baylor, Clay, Collin, Cooke, Dallas and 19 more | 6 hr |
| Dec 29, 3:24 PM CST | Mesoscale Discussion | SPC | Anderson, Aransas, Archer, Atascosa, Austin, Bastrop and 92 more | 2 hr |
| Dec 29, 5:38 PM CST | Tornado Watch | SPC | Anderson, Angelina, Aransas, Austin, Bastrop, Bee and 67 more | 10 hr |
Nearby
Mesoscale Discussions in Texas, 2006Mesoscale Discussions in Louisiana, 2006Every mesoscale discussion in 2006
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.