Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 29
The Storm Prediction Center issued this mesoscale discussion at Jan 24, 2004, 10:46 PM CST for Sabine Parish, Louisiana; 23 counties in Texas. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Jan 24, 2004, 10:46 PM CST (04:46 UTC)
- Expired
- Jan 25, 2004, 12:15 AM CST
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 24 counties
Sabine Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Newton County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Tyler County, TX, Waller County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 83 km from the middle of the area, began a volume at 04:49 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
Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.8 hours before the alert went out and 202 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
- 78 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
557 ACUS11 KWNS 250446 SWOMCD SPC MCD 250446 LAZ000-TXZ000-250615- MESOSCALE DISCUSSION 0029 NWS STORM PREDICTION CENTER NORMAN OK 1046 PM CST SAT JAN 24 2004 AREAS AFFECTED...SERN TX/WRN LA CONCERNING...TORNADO WATCH 1... VALID 250446Z - 250615Z ISOLATED SEVERE STORMS REMAIN POSSIBLE...THOUGH SHALLOW/STABLE BOUNDARY LAYER IS LIMITING OVERALL SEVERE THREAT. IF CURRENT TRENDS CONTINUE...WW WILL BE ALLOWED TO EXPIRE AT 06Z. THUNDERSTORM COVERAGE WILL CONTINUE TO EXPAND FROM SERN TX INTO WRN LA THROUGH 06-08Z...AS INCREASING UVVS ASSOCIATED WITH A NEGATIVELY TILTED SHORT WAVE TROUGH OVER CENTRAL TX SPREAD ACROSS WW 1 TO WRN LA. 75 KT SWLY MID-LEVEL SPEED MAX MOVING NEWD ACROSS WW1 TO WRN LA WILL CONTINUE TO SUPPORT ORGANIZED STORMS...WITH REGIONAL RADARS SHOWING A FEW STORMS WITH LOW-LEVEL ROTATION. OBJECTIVE ANALYSES INDICATE A STABLE BOUNDARY LAYER ACROSS SERN TX INTO WRN LA WHICH SUGGESTS CURRENT THUNDERSTORMS ARE SLIGHTLY ELEVATED. GIVEN STRENGTH OF LOW AND DEEP LAYER SHEAR ACROSS THE REGION...ANY STORM WHICH CAN ROOT INTO THE BOUNDARY LAYER WILL HAVE THE POTENTIAL TO PRODUCE TORNADOES. HOWEVER..LOSS OF DAY TIME HEATING WILL LIKELY MAINTAIN THE STABLE BOUNDARY LAYER...AND LIMIT THE SEVERE POTENTIAL TO MAINLY HAIL AOB 1 INCH IN DIAMETER. ..PETERS.. 01/25/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...SHV...HGX...CRP...EWX... 29989639 30799525 31579435 31569341 28719452 28749682
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 25, 1:11 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 15 more | 2 hr |
| Jan 25, 10:08 AM CST | Mesoscale Discussion | SPC | Jefferson, Orleans, Saint Bernard | 3 hr |
| Jan 24, 7:56 PM CST | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 22 more | 94 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.