Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 13, NWS Houston/Galveston, TX

April 16, 2015Chambers County, Harris County, Liberty County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Apr 16, 2015, 10:54 PM CDT for Chambers County, Harris County, Liberty 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 outline as issued.

The facts

Issued
Apr 16, 2015, 10:54 PM CDT (03:54 UTC)
Expired
Apr 17, 2015, 1:45 AM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Chambers County, TX, Harris County, TX, Liberty County, TX

The radar

The Houston radar (KHGX), 50 km from the middle of the area, began a volume at 03:58 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

Shreveport, LA (KBAD), launched 00:00Z, 3.9 hours before the alert went out and 311 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, Shreveport, LA at 00:00Z on 2015-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 479 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, Shreveport, LA at 00:00Z on 2015-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -94 square meters per square second.1939587897117Sfc1 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
479 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
983 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-94 m²/s²
0-3 km storm-relative helicity
-91 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-1.6

Open this sounding in Storm Lab

The text

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

577 
WGUS54 KHGX 170354
FFWHGX
TXC071-201-291-170645-
/O.NEW.KHGX.FF.W.0013.150417T0354Z-150417T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1054 PM CDT THU APR 16 2015

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN LIBERTY COUNTY IN SOUTHEASTERN TEXAS...
  EAST CENTRAL HARRIS COUNTY IN SOUTHEASTERN TEXAS...
  CHAMBERS COUNTY IN SOUTHEASTERN TEXAS...

* UNTIL 145 AM CDT
    
* AT 1052 PM CDT...DOPPLER RADAR CONTINUES TO INDICATE THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS LIKELY AS
  3 TO 8 INCHES OF RAIN HAS FALLEN.  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BAYTOWN...LIBERTY...DAYTON...BEACH CITY...BARRETT...CHANNELVIEW...
  HIGHLANDS...CLOVERLEAF...CROSBY...MONT BELVIEU...ANAHUAC...OLD
  RIVER-WINFREE...AMES...DAISETTA...COVE...DEVERS...SHELDON...
  WINNIE...STOWELL AND LAKE HOUSTON DAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 2961 9455 2973 9456 2971 9469 2979 9472
      2976 9482 2970 9487 2973 9502 2978 9505
      2974 9505 2974 9508 2976 9516 2997 9518
      3014 9462 3011 9460 3011 9445 2989 9444
      2989 9436 2968 9435

$$

LW

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 7:08 PM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty112 min
Apr 16, 7:10 PM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty2 hr
Apr 16, 7:20 PM CDTFlash Flood WarningHGXPolk, San Jacinto, Walker115 min
Apr 16, 7:27 PM CDTSpecial Weather StatementHGXWharton33 min
Apr 16, 7:36 PM CDTSevere Thunderstorm WarningHGXMatagorda, Wharton39 min
Apr 16, 8:06 PM CDTFlash Flood WarningHGXChambers, Harris, Liberty114 min
Apr 16, 8:14 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Matagorda, Wharton46 min
Apr 16, 8:22 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Wharton38 min
Apr 16, 8:57 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Fort Bend, Waller, Wharton48 min
Apr 16, 9:03 PM CDTFlash Flood WarningHGXChambers, Harris, Liberty117 min
Apr 16, 9:39 PM CDTAreal Flood AdvisoryHGXHarris, Montgomery2 hr
Apr 16, 9:45 PM CDTSevere Thunderstorm WarningHGXFort Bend30 min
Apr 16, 10:14 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend46 min
Apr 16, 10:25 PM CDTSmall Craft AdvisoryHGX9 hr
Apr 16, 10:41 PM CDTSpecial Marine WarningHGX49 min
Apr 16, 11:04 PM CDTAreal Flood AdvisoryHGXHarris3 hr
Apr 16, 11:48 PM CDTAreal Flood AdvisoryHGXBrazos, Burleson, Washington117 min
Apr 17, 12:00 AM CDTFlash Flood WarningHGXHarris2 hr
Apr 17, 4:09 AM CDTSpecial Marine WarningHGX36 min
Apr 17, 4:20 AM CDTSpecial Marine WarningHGX40 min
Apr 17, 4:44 AM CDTSpecial Marine WarningHGX46 min
Apr 17, 5:07 AM CDTSpecial Marine WarningHGX38 min
Apr 17, 5:21 AM CDTSpecial Marine WarningHGX84 min
Apr 17, 3:53 PM CDTSpecial Marine WarningHGX67 min
Apr 17, 4:26 PM CDTSpecial Weather StatementHGXMatagorda49 min
Apr 17, 4:49 PM CDTSevere Thunderstorm WarningHGXJackson41 min
Apr 17, 5:03 PM CDTAreal Flood AdvisoryHGXJackson3 hr
Apr 17, 5:39 PM CDTAreal Flood AdvisoryHGXColorado, Wharton3 hr
Apr 17, 5:45 PM CDTSevere Thunderstorm WarningHGXColorado, Jackson, Matagorda, Wharton45 min
Apr 17, 6:10 PM CDTSpecial Weather StatementHGXWaller35 min
Apr 17, 6:14 PM CDTFlash Flood WarningHGXColorado, Jackson, Wharton2 hr
Apr 17, 6:21 PM CDTSevere Thunderstorm WarningHGXAustin, Brazoria, Colorado, Fort Bend, Jackson, Matagorda and 2 more39 min
Apr 17, 6:32 PM CDTAreal Flood AdvisoryHGXAustin, Colorado, Fort Bend, Harris, Waller, Wharton118 min
Apr 17, 6:56 PM CDTAreal Flood AdvisoryHGXBrazoria, Fort Bend, Jackson, Matagorda, Wharton3 hr
Apr 17, 6:56 PM CDTSevere Thunderstorm WarningHGXAustin, Brazoria, Fort Bend, Galveston, Harris, Matagorda and 2 more49 min

Nearby

Flash Flood Warnings in Texas, 2015Every flash flood warning in 2015

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.