Alert archive / Texas / Flash Flood Watches in 2007

Flash Flood Watch 4, NWS Houston/Galveston, TX

July 2, 20074 counties in Texas

NWS Houston/Galveston, TX issued this flash flood watch at Jul 2, 2007, 10:04 AM CDT for 4 counties in Texas. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Jul 2, 2007, 10:04 AM CDT (15:04 UTC)
Expired
Jul 2, 2007, 2:47 PM CDT
In force
5 hr
Issued by
NWS Houston/Galveston, TX
Flood severity
None

Counties Brazoria County, TX, Jackson County, TX, Matagorda County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 106 km from the middle of the area, began a volume at 15:05 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

Corpus Christi, TX (KCRP), launched 12:00Z, 3.1 hours before the alert went out and 193 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, Corpus Christi, TX at 12:00Z on 2007-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2074 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, Corpus Christi, TX at 12:00Z on 2007-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
2074 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
647 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 2, 9:52 AM CDT, 12 minutes earlier.

Area forecast discussion, Jul 2, 9:52 AM CDT, 12 minutes before
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Hazardous weather outlook, Jul 2, 3:11 AM CDT, 6 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
311 AM CDT MON JUL 2 2007

GMZ330-335-TXZ163-164-176>179-195>200-210>214-226-227-235>238-
031200-
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-
311 AM CDT MON JUL 2 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

DEEP TROPICAL MOISTURE WILL PERSIST ACROSS THE AREA. SHOWERS AND THUNDERSTORMS
ARE LIKELY AND LOCALLY HEAVY RAINFALL MAY BE POSSIBLE. RAINFALL TOTALS
ARE EXPECTED TO AVERAGE BETWEEN 1 AND 2 INCHES WITH ISOLATED 3 TO 5
INCH AMOUNTS POSSIBLE IN ASSOCIATION WITH THE STRONGER STORMS OR WHERE
TRAINING DEVELOPS. A FLOOD WATCH MAY BE NEEDED FOR PORTIONS OF THE AREA.

.DAYS TWO AND THREE...TUESDAY AND WEDNESDAY

LITTLE CHANGE IS EXPECTED AS DEEP TROPICAL MOISTURE CONTINUES ACROSS
THE AREA. SHOWERS AND THUNDERSTORMS ARE LIKELY AND LOCALLY HEAVY RAINFALL
MAY BE POSSIBLE. RAINFALL TOTALS ARE EXPECTED TO AVERAGE BETWEEN 1 AND
2 INCHES WITH ISOLATED 3 TO 5 INCH AMOUNTS POSSIBLE IN ASSOCIATION WITH
THE STRONGER STORMS OR WHERE TRAINING DEVELOPS. A FLOOD WATCH MAY BE
NEEDED FOR PORTIONS OF THE AREA.

.DAYS FOUR THROUGH SEVEN...THURSDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME. SHOWER AND THUNDERSTORM
ACTIVITY IS EXPECTED TO DECREASE IN COVERAGE AS THE AREA BEGINS TO
SLOWLY DRY OUT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 4:36 AM CDTFlash Flood WarningHGXJackson3 hr
Jul 2, 9:11 AM CDTSpecial Marine WarningHGX2 hr

Nearby

Flash Flood Watches in Texas, 2007Every flash flood watch 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.