Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 698
The Storm Prediction Center issued this mesoscale discussion at May 13, 2004, 10:13 PM CDT for 8 counties in Texas. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- May 13, 2004, 10:13 PM CDT (03:13 UTC)
- Expired
- May 13, 2004, 11:45 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
Counties Brooks County, TX, Cameron County, TX, Hidalgo County, TX, Jim Hogg County, TX, Kenedy County, TX, Starr County, TX, Willacy County, TX, Zapata County, TX
The radar
The Brownsville radar (KBRO), 146 km from the middle of the area, began a volume at 03:16 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
Brownsville Intl, TX (KBRO), launched 00:00Z, 3.2 hours before the alert went out and 149 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
- 3234 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 633 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.0
The text
As transmitted, in the capitals the NWS used until 2016.
844 ACUS11 KWNS 140314 SWOMCD SPC MCD 140313 TXZ000-140445- MESOSCALE DISCUSSION 0698 NWS STORM PREDICTION CENTER NORMAN OK 1013 PM CDT THU MAY 13 2004 AREAS AFFECTED...DEEP S TX CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 140313Z - 140445Z TSTMS HAVE BEEN APPROACHING THE RIO GRANDE VLY ABOUT 70 MILES S OF KLRD THIS EVENING...AS COLD POOLS BECOME ESTABLISHED FROM MEXICAN CONVECTION. EVENING KBRO SOUNDING SHOWED CONSIDERABLE POTENTIAL INSTABILITY...WITH MUCAPES OF 3800 J/KG AND WLY DEEP LAYER SHEAR OF AROUND 40 KTS. AS THE LOW LEVEL FLOW DECOUPLES...ADDITIONAL TSTMS SHOULD DEVELOP EWD INTO DEEP SOUTH TX WITH CONVECTION LIKELY REMAINING ORGANIZED...PARTICULARLY WEST OF MCALLEN. VERY STEEP LAPSE RATES AND RICH BOUNDARY LAYER MOISTURE WILL CONTRIBUTE TO LARGE HAIL AND DAMAGING WIND THREATS...AND A WW MAY BE REQUIRED SHORTLY. ..RACY.. 05/14/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CRP...BRO... 27659952 26909712 25679707 25619863 26399998
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | Aransas, Bee, Dimmit, Duval, Frio, Jim Wells and 9 more | 5 hr |
| May 13, 9:39 PM CDT | Mesoscale Discussion | SPC | Bandera, Edwards, Gillespie, Kerr, Kimble, Mason and 5 more | 96 min |
| May 13, 9:57 PM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Dimmit, Duval, Frio, Jim Wells and 9 more | 93 min |
| May 13, 11:17 PM CDT | Mesoscale Discussion | SPC | Aransas, Bandera, Bee, Brooks, Cameron, Dimmit and 27 more | 58 min |
| May 13, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Hidalgo, Kenedy, Kleberg, Starr and 1 more | 4 hr |
| May 14, 2:14 AM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Hidalgo, Kenedy, Kleberg, Starr and 1 more | 91 min |
Nearby
Mesoscale Discussions in Texas, 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.