Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 280
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2004, 2:43 PM CDT for Beauregard Parish, Calcasieu Parish, Louisiana; 15 counties in Texas. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2004, 2:43 PM CDT (19:43 UTC)
- Expired
- Apr 6, 2004, 3:45 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
Counties Beauregard Parish, LA, Calcasieu Parish, LA, Aransas County, TX, Bee County, TX, Calhoun County, TX, DeWitt County, TX, Galveston County, TX, Goliad County, TX, Jackson County, TX, Jefferson County, TX, Jim Wells County, TX, Matagorda County, TX, Nueces County, TX, Orange County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX
The radar
The Houston radar (KHGX), 77 km from the middle of the area, began a volume at 19:47 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, 7.7 hours before the alert went out and 222 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
- 1044 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 598 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 9.2
The text
As transmitted, in the capitals the NWS used until 2016.
375 ACUS11 KWNS 061943 SWOMCD SPC MCD 061943 LAZ000-TXZ000-062045- MESOSCALE DISCUSSION 0280 NWS STORM PREDICTION CENTER NORMAN OK 0243 PM CDT TUE APR 06 2004 AREAS AFFECTED...MIDDLE/UPPER TX COAST INTO EXTREME SWRN LA CONCERNING...TORNADO WATCH 47... VALID 061943Z - 062045Z TORNADO WATCH 47 WILL BE ALLOWED TO EXPIRE AT 21 UTC AND WILL NOT BE ISSUED DOWNSTREAM. NRN PART OF A LINE OF TSTMS CONTINUES TO MOVE ESEWD TOWARD THE SABINE RVR WITH EMBEDDED SUPERCELL APPROACHING JEFFERSON COUNTY. THE TSTMS WILL BE ENTERING AN INCREASINGLY STABLE AIR MASS DOWNSTREAM WHERE ELY LOW LEVEL TRAJECTORIES EXIST OVER SRN LA. AS A RESULT...EXPECTATION IS THAT THE STORM SHOULD WEAKEN OVER THE NEXT HOUR AS IT ENTERS COASTAL CAMERON PARISH. OTHERWISE...OUTFLOW BOUNDARY HAS MOVED OFFSHORE OF SERN TX WITH NUMEROUS TSTMS/SUPERCELLS WELL OFFSHORE. THERE HAVE BEEN A FEW ATTEMPTS OF TSTM INITIATION OVER THE TOP OF THE COLD DOME THAT EXISTS ACROSS MOST OF SERN TX...BUT GIVEN THAT THE MIDLEVEL IMPULSE HAS PASSED OFF TO THE NE OF THE REGION...TSTMS HAVE REMAINED BELOW SEVERE LIMITS. ..RACY.. 04/06/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...HGX...CRP...EWX... 28599812 29169725 29109630 28799535 29779443 30719389 30879327 28999326 27439810
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 11:05 AM CDT | Tornado Watch | SPC | Beauregard, Calcasieu | 5 hr |
| Apr 6, 12:52 PM CDT | Mesoscale Discussion | SPC | Beauregard, Calcasieu | 83 min |
| Apr 5, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bexar, Blanco, Comal, Frio, Gillespie and 13 more | 6 hr |
| Apr 5, 11:55 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Gillespie, Kendall, Kerr, Llano and 5 more | 2 hr |
| Apr 6, 2:42 AM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Burnet, Comal, Dimmit and 12 more | 63 min |
| Apr 6, 7:39 AM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bee, Brazoria, Colorado, DeWitt and 14 more | 66 min |
| Apr 6, 7:55 AM CDT | Tornado Watch | SPC | Aransas, Austin, Bee, Brazoria, Brazos, Burleson and 20 more | 5 hr |
| Apr 6, 9:29 AM CDT | Mesoscale Discussion | SPC | Aransas, Austin, Bee, Brazoria, Brazos, Burleson and 20 more | 91 min |
| Apr 6, 10:27 AM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 3 more | 63 min |
| Apr 6, 2:19 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Childress, Clay, Cottle, Crosby and 22 more | 116 min |
Nearby
Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Louisiana, 2004Every mesoscale discussion in 2004
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.