Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 134, NWS Houston/Galveston, TX

July 14, 2007Harris County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jul 14, 2007, 9:44 PM CDT for Harris County, Montgomery County, Texas. It was in force for 15 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
Jul 14, 2007, 9:44 PM CDT (02:44 UTC)
Expired
Jul 14, 2007, 9:59 PM CDT
In force
15 min
Issued by
NWS Houston/Galveston, TX
Area
Counties, with a storm outline in the text

Counties Harris County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 76 km from the middle of the area, began a volume at 02:47 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.7 hours before the alert went out and 216 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 2007-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1793 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 2007-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.1939Sfc1 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
1793 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
751 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

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 Jul 14, 8:48 PM CDT, 56 minutes earlier.

Area forecast discussion, Jul 14, 8:48 PM CDT, 56 minutes before
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Hazardous weather outlook, Jul 14, 5:45 AM CDT, 15 hours 59 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
545 AM CDT SAT JUL 14 2007

GMZ330-335-TXZ163-164-176>179-195>200-210>214-226-227-235>238-
151045-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-
MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO-
TRINITY-WALKER-WALLER-WASHINGTON-WHARTON-
545 AM CDT SAT JUL 14 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED MAINLY ACROSS THE NORTHERN
HALF OF SOUTHEAST TEXAS WHERE A FRONTAL BOUNDARY REMAINS STALLED.
AN UPPER LEVEL LOW PRESSURE SYSTEM IS ALSO DEVELOPING OVER THE
AREA. THIS WILL ALLOW FOR INCREASED THUNDERSTORM ACTIVITY TODAY
AND THROUGH EARLY NEXT WEEK. THE MAIN THREATS WILL BE HEAVY
RAINFALL WHERE SOME AREAS COULD SEE 1 TO 3 INCHES WITH ISOLATED
HIGHER AMOUNTS. SOME OF THE STRONGER STORMS COULD PRODUCE
FLOODING IN LOW LYING AREAS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORM CHANCES ARE EXPECTED TO INCREASE THROUGH EARLY NEXT
WEEK AS AN UPPER LEVEL LOW PRESSURE SYSTEM DEVELOPS OVER EAST
TEXAS. THIS LOW PRESSURE SYSTEM WITH GULF MOISTURE WILL CAUSE
SCATTERED TO NUMEROUS THUNDERSTORMS ACROSS SOUTHEAST TEXAS. THE
BEST CHANCES OF THUNDERSTORMS APPEARS TO BE IN THE SUNDAY THROUGH
TUESDAY TIME FRAME. SOME OF THESE STORMS COULD PRODUCE LOCALLY
HEAVY RAINFALL. STREET FLOODING AND FLOODING OF LOW LYING AREAS
WILL BE POSSIBLE IN SOME OF THESE STRONGER STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 8:32 PM CDTTornado WarningHGXMontgomery28 min
Jul 15, 10:02 AM CDTSpecial Marine WarningHGX118 min
Jul 15, 11:07 AM CDTRiver Flood WarningHGXBrazos, Burleson, Grimes, Washington58 hr
Jul 15, 11:07 AM CDTRiver Flood WarningHGXAustin, Brazoria, Fort Bend, Waller22 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2007Every severe thunderstorm warning in 2007

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.