Alert archive / Texas / Flash Flood Warnings in 2007

Flash Flood Warning 26, NWS Houston/Galveston, TX

June 17, 2007Brazoria County, Harris County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 17, 2007, 12:26 PM CDT for Brazoria County, Harris County, Texas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 17, 2007, 12:26 PM CDT (17:26 UTC)
Expired: Jun 17, 2007, 2:30 PM CDT
In force: 2 hr
Issued by: NWS Houston/Galveston, TX
Area: Whole counties

Counties Brazoria County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 33 km from the middle of the area, began a volume at 17:29 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, 5.4 hours before the alert went out and 273 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1564 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 701 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jun 17, 10:39 AM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Jun 17, 10:39 AM CDT, 1 hour 47 minutes before

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Hazardous weather outlook, Jun 17, 6:15 AM CDT, 6 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
615 AM CDT SUN JUN 17 2007

GMZ330-335-TXZ163-164-176>179-195>200-210>214-226-227-235>238-
181100-
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-
615 AM CDT SUN JUN 17 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

...FLASH FLOOD WATCH IS IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.DAY ONE...TODAY AND TONIGHT

DISTURBANCES ROTATING AROUND A MID/UPPER LEVEL LOW CENTERED OVER
NORTH TEXAS WILL PRODUCE THUNDERSTORMS TODAY AND INTO THIS EVENING
ACROSS THE AREA. DUE TO THE POTENTIAL OF THUNDERSTORM TRAINING IN A
VERY MOIST AND AN UNSTABLE ATMOSPHERE...ISOLATED LOCATIONS COULD
EXPERIENCE 3 TO 6 INCHES OF RAINFALL TODAY.

IN ADDITION TO THE HEAVY RAINFALL/FLOODING THREAT...THE ATMOSPHERE
WILL BE CONDUCIVE TO FUNNEL CLOUD AND WATERSPOUT DEVELOPMENT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 4:31 AM CDT	Flash Flood Watch	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	14 hr
Jun 17, 6:55 AM CDT	Flash Flood Warning	HGX	Brazos	110 min
Jun 17, 7:27 AM CDT	Flash Flood Warning	HGX	Washington	2 hr

Nearby

Flash Flood Warnings in Texas, 2007 Every flash flood 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.