Alert archive / Texas / Flash Flood Warnings in 2010

Flash Flood Warning 21, NWS Houston/Galveston, TX

September 7, 20104 counties in Texas

NWS Houston/Galveston, TX issued this flash flood warning at Sep 7, 2010, 8:55 AM CDT for 4 counties in 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 outline as issued.

The facts

Issued
Sep 7, 2010, 8:55 AM CDT (13:55 UTC)
Expired
Sep 7, 2010, 12:00 PM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Colorado County, TX, Jackson County, TX, Matagorda County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 129 km from the middle of the area, began a volume at 13:57 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, 1.9 hours before the alert went out and 170 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 2010-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1004 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, Corpus Christi, TX at 12:00Z on 2010-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.19395878Sfc1 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
1004 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
455 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

368 
WGUS54 KHGX 071355
FFWHGX
TXC089-239-321-481-071700-
/O.NEW.KHGX.FF.W.0021.100907T1355Z-100907T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
855 AM CDT TUE SEP 7 2010

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COLORADO COUNTY IN SOUTHEAST TEXAS...
  JACKSON COUNTY IN SOUTHEAST TEXAS...
  MATAGORDA COUNTY IN SOUTHEAST TEXAS...
  WHARTON COUNTY IN SOUTHEAST TEXAS...

* UNTIL NOON CDT

* AT 852 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THAT FLASH FLOODING WAS LIKELY FROM WIDESPREAD MODERATE RAIN AND 
EMBEDDED THUNDERSTORMS. THE EMBEDDED STORMS WILL PRODUCE LOCALLY 
HEAVY RAIN WHICH WILL LIKELY CAUSE FLASH FLOODING IN THE WARNING 
AREA. 3 TO 4 INCHES OF RAIN HAS ALREADY FALLEN OVER PARTS OF JACKSON 
AND MATAGORDA COUNTIES AND 1 TO 3 INCHES OF RAIN HAS FALLEN OVER 
PARTS OF COLORADO AND WHARTON COUNTIES. AN ADDITIONAL 2 TO 3 INCHES 
OF RAIN IS EXPECTED THIS MORNING OVER PARTS OF THE WARNING AREA.

* LOCATIONS IN THE FLOOD WARNING INCLUDE BUT ARE NOT LIMITED TO
  WADSWORTH...VANDERBILT...SOUTH TEXAS NUCLEAR PLANT...SHERIDAN...
  SARGENT...ROCK ISLAND...PIERCE...NADA...MORALES...MIDFIELD...
  MATAGORDA...LOUISE...LAKE TEXANA DAM...HUNGERFORD...GARWOOD...
  FRELSBURG...EGYPT...DANEVANG...CORDELE...BLESSING...WHARTON...
  WEIMAR...VAN VLECK...PALACIOS...MARKHAM...LA WARD...GANADO...EL
  CAMPO...EDNA...EAGLE LAKE...COLUMBUS AND BOLING-IAGO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SMALL CREEKS...STREAMS...BAYOUS..AND FARM-TO-MARKET OR OTHER
SECONDARY ROADS MAY FLOOD QUICKLY. AVOID LOCATIONS WHERE WATER COVERS
THE GROUND!

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS...CREEKS...AND BAYOUS SHOULD TAKE
IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO
CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

A FLOOD WATCH IS IN EFFECT UNTIL 7 AM WEDNESDAY MORNING FOR THE 
WARNED AREA.

&&

PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY AND ASK THEM TO RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE.

LAT...LON 2933 9657 2966 9686 2993 9657 2958 9616
      2898 9577 2880 9556 2866 9584 2868 9593
      2864 9590 2848 9622 2849 9623 2860 9600
      2862 9599 2856 9623 2868 9621 2863 9632
      2872 9640 2869 9658 2908 9688

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 9:20 PM CDTCoastal Flood AdvisoryHGXBrazoria, Chambers, Galveston, Matagorda7 hr
Sep 7, 6:12 AM CDTSpecial Marine WarningHGX2 hr
Sep 7, 6:30 AM CDTAreal Flood AdvisoryHGXColorado, Jackson, Matagorda, Wharton3 hr
Sep 7, 7:55 AM CDTSpecial Marine WarningHGX2 hr
Sep 7, 9:28 AM CDTTornado WarningHGXFort Bend, Waller32 min
Sep 7, 9:53 AM CDTSpecial Marine WarningHGX112 min
Sep 7, 10:00 AM CDTTornado WarningHGXWaller, Washington30 min
Sep 7, 10:52 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson23 min
Sep 7, 11:04 AM CDTTornado WarningHGXBrazos26 min
Sep 7, 11:36 AM CDTSpecial Marine WarningHGX114 min
Sep 7, 11:42 AM CDTAreal Flood AdvisoryHGXHarris63 min
Sep 7, 11:45 AM CDTCoastal Flood AdvisoryHGXBrazoria, Galveston, Matagorda17 hr
Sep 7, 11:52 AM CDTSevere Thunderstorm WarningHGXMatagorda24 min
Sep 7, 11:58 AM CDTFlash Flood WarningHGXColorado, Jackson, Matagorda, Wharton2 hr
Sep 7, 12:38 PM CDTFlash Flood WarningHGXHarris3 hr
Sep 7, 12:51 PM CDTSpecial Marine WarningHGX114 min
Sep 7, 12:59 PM CDTSpecial Weather StatementHGXHarris31 min
Sep 7, 1:26 PM CDTSpecial Marine WarningHGX2 hr
Sep 7, 1:32 PM CDTSevere Thunderstorm WarningHGXLiberty, Montgomery, San Jacinto, Walker43 min
Sep 7, 1:53 PM CDTFlash Flood WarningHGXColorado, Jackson, Matagorda, Wharton112 min
Sep 7, 2:43 PM CDTSpecial Marine WarningHGX2 hr
Sep 7, 2:52 PM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty3 hr
Sep 7, 3:16 PM CDTSpecial Weather StatementHGXChambers, Liberty59 min
Sep 7, 3:46 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Matagorda, Wharton59 min
Sep 7, 4:43 PM CDTSpecial Marine WarningHGX47 min

Nearby

Flash Flood Warnings in Texas, 2010Every 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.