Alert archive / Texas / Flash Flood Warnings in 2010

Flash Flood Warning 10, NWS Houston/Galveston, TX

July 1, 2010Brazoria County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jul 1, 2010, 11:22 AM CDT for Brazoria County, Texas. It was in force for 3 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: Jul 1, 2010, 11:22 AM CDT (16:22 UTC)
Expired: Jul 1, 2010, 2:15 PM CDT
In force: 3 hr
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

County Brazoria County, TX

The radar

The Houston radar (KHGX), 48 km from the middle of the area, began a volume at 16:21 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, 4.4 hours before the alert went out and 246 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: 3628 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 483 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 172 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 Jul 1, 9:53 AM CDT, 1 hour 29 minutes earlier.

Area forecast discussion, Jul 1, 9:53 AM CDT, 1 hour 29 minutes before

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Hazardous weather outlook, Jul 1, 9:41 AM CDT, 1 hour 41 minutes before

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In the hours before

Special weather statement, Jul 1, 10:21 AM CDT, 1 hour 1 minute before

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Special weather statement, Jul 1, 10:39 AM CDT, 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1039 AM CDT THU JUL 1 2010

TXZ236-237-011615-
BRAZORIA-MATAGORDA-
1039 AM CDT THU JUL 1 2010

...SIGNIFICANT WEATHER ADVISORY...

AT 1036 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 5 MILES WEST OF ANGLETON...MOVING WEST AT 30 MPH.

FUNNEL CLOUDS...WINDS GREATER THAN 40 MPH...ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IN THE PATH OF THIS STORM INCLUDE...WEST COLUMBIA...
SWEENY...BAILEY'S PRAIRIE AND ANGLETON.

GUSTY WINDS MAY CAUSE UNSECURED SMALL OBJECTS SUCH AS TRASH CANS TO
BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE OR NON-CONVERTABLE
AUTOMOBILE UNTIL THIS STORM HAS PASSED.

LAT...LON 2928 9584 2930 9581 2931 9580 2922 9541
      2904 9545 2903 9586
TIME...MOT...LOC 1539Z 105DEG 26KT 2919 9553

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 7:38 PM CDT	Special Marine Warning	HGX		52 min
Jun 30, 7:44 PM CDT	Special Weather Statement	HGX	Brazoria	61 min
Jun 30, 9:38 PM CDT	Special Marine Warning	HGX		67 min
Jun 30, 11:00 PM CDT	Special Marine Warning	HGX		60 min
Jun 30, 11:22 PM CDT	Special Weather Statement	HGX	Brazoria	53 min
Jul 1, 3:00 AM CDT	Special Weather Statement	HGX	Chambers	60 min
Jul 1, 7:40 AM CDT	Special Marine Warning	HGX		65 min
Jul 1, 9:35 AM CDT	Flash Flood Watch	HGX	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 5 more	36 hr
Jul 1, 9:44 AM CDT	River Flood Warning	HGX	Brazoria	4 days
Jul 1, 10:16 AM CDT	Special Marine Warning	HGX		44 min
Jul 1, 10:21 AM CDT	Special Weather Statement	HGX	Brazoria	54 min
Jul 1, 10:39 AM CDT	Special Weather Statement	HGX	Brazoria	36 min
Jul 1, 10:46 AM CDT	Areal Flood Advisory	HGX	Brazoria, Matagorda	119 min
Jul 1, 11:21 AM CDT	Areal Flood Advisory	HGX	Galveston	114 min
Jul 1, 12:01 PM CDT	Special Marine Warning	HGX		59 min
Jul 1, 12:29 PM CDT	Areal Flood Advisory	HGX	Harris	2 hr
Jul 1, 1:51 PM CDT	Flash Flood Warning	HGX	Brazoria	6 hr
Jul 1, 3:05 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend	25 min
Jul 1, 4:18 PM CDT	River Flood Warning	HGX	Matagorda, Wharton	65 hr
Jul 1, 4:59 PM CDT	Areal Flood Advisory	HGX	Matagorda	2 hr

Nearby

Flash Flood Warnings in Texas, 2010 Every flash flood warning in 2010

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.