Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 21, NWS Houston/Galveston, TX

April 21, 2006San Jacinto County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 21, 2006, 6:07 AM CDT for San Jacinto County, Texas. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 21, 2006, 6:07 AM CDT (11:07 UTC)
Expired
Apr 21, 2006, 6:30 AM CDT
In force
23 min
Issued by
NWS Houston/Galveston, TX
Area
Counties, with a storm outline in the text

County San Jacinto County, TX

The radar

The Houston radar (KHGX), 147 km from the middle of the area, began a volume at 11:09 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, 11.1 hours before the alert went out and 209 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.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 2006-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 479 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2006-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
479 J/kg
Mixed-layer CIN
-150 J/kg
Mixed-layer LCL
1245 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-34 m²/s²
0-3 km storm-relative helicity
-15 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KHGX 211107
SVRHGX
TXC407-211130-
/O.NEW.KHGX.SV.W.0021.060421T1107Z-060421T1130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
607 AM CDT FRI APR 21 2006

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN SAN JACINTO COUNTY IN SOUTHEAST TEXAS

* UNTIL 630 AM CDT

* AT 600 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL. THIS STORM  WAS 
LOCATED NEAR ONALASKA...MOVING EAST AT 45 MPH.

THIS STORM MAY PRODUCE LARGE DAMAGING HAIL...RESULTING IN EXTENSIVE
PROPERTY DAMAGE OR SERIOUS INJURY. AVOID WINDOWS AND TAKE COVER NOW

PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY. THEY WILL RELAY YOUR REPORT TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 3083 9521 3080 9516 3075 9515 3073 9517
      3069 9527 3069 9530 3076 9533 3088 9531
      3088 9525

$$

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 7:20 PM CDTTornado WarningHGXGrimes, Waller40 min
Apr 20, 7:28 PM CDTTornado WarningHGXWashington21 min
Apr 20, 9:04 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson56 min
Apr 20, 9:30 PM CDTSevere Thunderstorm WarningHGXGrimes, Madison60 min
Apr 20, 9:56 PM CDTSevere Thunderstorm WarningHGXHouston, Montgomery, Walker64 min
Apr 20, 10:41 PM CDTSevere Thunderstorm WarningHGXSan Jacinto, Trinity46 min
Apr 21, 4:44 AM CDTSevere Thunderstorm WarningHGXAustin, Colorado61 min
Apr 21, 5:23 AM CDTSpecial Marine WarningHGX2 hr
Apr 21, 5:24 AM CDTSevere Thunderstorm WarningHGXFort Bend, Jackson, Wharton66 min
Apr 21, 5:44 AM CDTSevere Thunderstorm WarningHGXHarris61 min
Apr 21, 6:01 AM CDTTornado WarningHGXFort Bend29 min
Apr 21, 6:15 AM CDTSevere Thunderstorm WarningHGXBrazoria, Matagorda60 min
Apr 21, 6:29 AM CDTSevere Thunderstorm WarningHGXFort Bend31 min
Apr 21, 6:36 AM CDTSevere Thunderstorm WarningHGXPolk39 min
Apr 21, 6:42 AM CDTSevere Thunderstorm WarningHGXHarris48 min
Apr 21, 6:44 AM CDTSpecial Marine WarningHGX2 hr
Apr 21, 6:55 AM CDTSevere Thunderstorm WarningHGXGalveston50 min
Apr 21, 7:18 AM CDTSevere Thunderstorm WarningHGXChambers42 min
Apr 21, 7:23 AM CDTSevere Thunderstorm WarningHGXLiberty37 min
Apr 21, 8:47 AM CDTSpecial Marine WarningHGX43 min

Nearby

Severe Thunderstorm Warnings in Texas, 2006Every severe thunderstorm warning 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.