Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 157, NWS Houston/Galveston, TX

October 12, 2006Matagorda County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Oct 12, 2006, 10:21 PM CDT for Matagorda County, Texas. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 12, 2006, 10:21 PM CDT (03:21 UTC)
Expired
Oct 12, 2006, 11:00 PM CDT
In force
39 min
Issued by
NWS Houston/Galveston, TX
Area
Counties, with a storm outline in the text

County Matagorda County, TX

The radar

The Houston radar (KHGX), 118 km from the middle of the area, began a volume at 03:23 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.4 hours before the alert went out and 309 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 2006-10-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1522 joules per kilogram.LCLEL10008507005003002001001 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 2006-10-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.1939587897117Sfc1 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
1522 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
712 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 12, 9:11 PM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Oct 12, 9:11 PM CDT, 1 hour 10 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
911 PM CDT THU OCT 12 2006

.UPDATE...
SEVERE THUNDERSTORM WATCH 824 EXPIRED AT 02Z. WITH THE COLD FRONT
CONTINUING TO MAKE PROGRESS TOWARD THE COAST...A COOLER AND DRIER
AIRMASS (TEMPERATURES IN THE UPPER 50S AND DEWPOINTS IN THE UPPER
40S) HAS BEGUN TO FILTER INTO THE NORTHERN PORTIONS OF THE AREA.
WILL KEEP LOW POPS IN TONIGHTS FORECAST UP NORTH AND HIGHER
VALUES TOWARD THE COAST.

ENJOY THIS BRIEF COOLDOWN WHILE YOU CAN. IT LOOKS LIKE A QUICK
WARMUP IS IN STORE FOR THE AREA THIS WEEKEND. UNSEASONABLY WARM
OVERNIGHT LOW TEMPERATURES AND WARMER THAN NORMAL HIGH
TEMPERATURES ARE IN STORE FOR SOUTHEAST TEXAS STARTING SUNDAY
MORNING AND CONTINUING INTO THE MIDDLE OF NEXT WEEK...AND IT
LOOKS LIKE ITS GOING TO BE WET. 42
&&

.PREV DISCUSSION... (ISSUED 254 PM CDT THU OCT 12 2006)

DISCUSSION...
COLD FRONT MOVING ACROSS NORTHERN ZONES WITH THE BOUNDARY EXTENDING
FROM JUST NORTH OF CLL TO NEAR UTS TO JUST SOUTH OF LFK. SEVERE
THUNDERSTORM WATCH 824 IN EFFECT (EXCEPT FOR MADISON...HOUSTON
AND TRINITY COUNTIES) UNTIL 9 PM CDT. FRONT SHOULD REACH COAST
NEAR MIDNIGHT AND MOVE TO NEAR COASTAL BEND AND OFFSHORE REGION
FRIDAY MORNING. FRONT EXPECTED TO SLOW DOWN AND JUST SW OF CWFA
WITH LOW LEVEL MOISTURE POOLING CONTINUING SW ZONES FRIDAY.
NE ZONES SHOULD GET A DECENT SHOT OF DRIER AND SOMEWHAT COOLER AIR
TOMORROW. UPPER LOW MOVING ACROSS SW CONUS EARLY THIS WEEKEND WILL
RESULT IN PRESSURE FALLS OVER WESTERN HIGH PLAINS. LOW LEVEL JET
WILL BE ENHANCED ACROSS THE HEART OF THE LONE STAR STATE. WARM
FRONT PUSHING NORTH SATURDAY WITH INCREASING PW VALUES. TIME
CROSS-SECTIONS INDICATE GOOD LIFT ON SUNDAY THROUGH MONDAY. UPPER
TROUGH WILL MOVE ACROSS TEXAS ON MONDAY. REGION WILL BE UNDER
FIELD OF DIVERGENCE MONDAY WITH RR QUAD OF UPPER JET NEARBY. THE
ONLY BREAK (SOMEWHAT, THAT IS) FROM RAIN CHANCES FOR OUR CWFA
PROBABLY WILL BE ON TUESDAY AND EARLY WEDNESDAY. GFS INDICATE A
COLD FRONT PUSHING ACROSS REGION LATE WEDNESDAY.
37

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...SMALL CRAFT ADVISORY FROM 1 AM FRIDAY TO 1 PM FRIDAY FOR THE
     FOLLOWING ZONES: WATERS FROM FREEPORT TO THE MATAGORDA SHIP
     CHANNEL OUT 20 NM...AND WATERS FROM HIGH ISLAND TO FREEPORT
     OUT 20 NM.

     SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 10 AM FRIDAY FOR THE
     FOLLOWING ZONES: GALVESTON BAY...AND MATAGORDA BAY.

     SMALL CRAFT SHOULD EXERCISE CAUTION FROM 1 AM FRIDAY TO 1 PM
     FRIDAY FOR THE FOLLOWING ZONES: AND WATERS FROM HIGH ISLAND
     TO FREEPORT 20 TO 60 NM.

&&
Hazardous weather outlook, Oct 12, 9:35 PM CDT, 46 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 12, 7:37 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Fort Bend, Wharton38 min
Oct 12, 9:25 PM CDTSpecial Marine WarningHGX35 min
Oct 12, 9:40 PM CDTSevere Thunderstorm WarningHGXGalveston50 min
Oct 12, 9:47 PM CDTSpecial Marine WarningHGX58 min
Oct 12, 11:01 PM CDTSpecial Marine WarningHGX89 min
Oct 12, 11:29 PM CDTSpecial Marine WarningHGX91 min
Oct 13, 12:25 AM CDTSpecial Marine WarningHGX2 hr
Oct 13, 1:50 AM CDTSpecial Marine WarningHGX55 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.