Alert archive / Texas / Flash Flood Warnings in 2019

Flash Flood Warning 14, NWS Houston/Galveston, TX

May 7, 2019Harris County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at May 7, 2019, 11:37 PM CDT for Harris County, Texas. It was in force for 113 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 7, 2019, 11:37 PM CDT (04:37 UTC)
Expired
May 8, 2019, 1:30 AM CDT
In force
113 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

County Harris County, TX

The radar

The Houston radar (KHGX), 52 km from the middle of the area, began a volume at 04:37 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.6 hours before the alert went out and 213 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, Lake Charles Mun, LA at 00:00Z on 2019-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1512 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, Lake Charles Mun, LA at 00:00Z on 2019-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 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
1512 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
-14 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 May 7, 10:42 PM CDT, 55 minutes earlier.

Area forecast discussion, May 7, 10:42 PM CDT, 55 minutes before
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Hazardous weather outlook, May 7, 6:13 AM CDT, 17 hours 24 minutes before
Hazardous Weather Outlook
National Weather Service Houston/Galveston TX
613 AM CDT Tue May 7 2019

TXZ163-164-176>179-195>200-210>214-226-227-235>238-300-313-
335>338-081115-
Austin-Brazos-Burleson-Chambers-Coastal Brazoria-
Coastal Galveston-Coastal Harris-Coastal Jackson-
Coastal Matagorda-Colorado-Fort Bend-Grimes-Houston-
Inland Brazoria-Inland Galveston-Inland Harris-Inland Jackson-
Inland Matagorda-Madison-Montgomery-Northern Liberty-Polk-
San Jacinto-Southern Liberty-Trinity-Walker-Waller-Washington-
Wharton-
613 AM CDT Tue May 7 2019

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

Showers and thunderstorms will develop over the coast and Gulf
waters before spreading inland, mostly along and west of I-45 by
the early afternoon hours, and then better concentrating over our
northern zones by this evening. Locally heavy rainfall, damaging
wind and hail will be the main weather hazards.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Strong storms are possible Wednesday into Thursday as another
upper level disturbance moves across the region. This feature can
also produce scattered showers and thunderstorms, and some of the
storms could produce heavy rain and localized flooding. Damaging
winds, hail, and isolated tornadoes will also be possible.

Another upper level disturbance coupled with an approaching cold
front will set the stage for additional strong thunderstorms on
Friday into the weekend. The cold front will stall over Southeast
Texas Friday and Saturday. A series of upper level disturbances
coupled with the front and abundant moisture will create a
favorable environment for heavy rain both days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today. Emergency managers
should prepare for activation at various times during the
upcoming week.

TXZ436>438-081115-
Brazoria Islands-Galveston Island and Bolivar Peninsula-
Matagorda Islands-
613 AM CDT Tue May 7 2019

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

Some showers and thunderstorms will be possible today, and could
produce heavy rainfall, gusty winds, and hail.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Slightly elevated water levels will approach 3.5 feet by
Wednesday morning. Coastal run-up will be possible, potentially
impacting vulnerable locations such as Highway 87 and 124. Strong
rip currents will also be possible along Gulf facing beaches.

A series of upper level disturbances will bring periods of showers
and thunderstorms to the area during the upcoming week. Some
storms could be strong with gusty winds, hail and periods of
heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today. Emergency managers
should prepare for activation at various times during the
upcoming week.

GMZ330-335-350-355-370-375-081115-
Coastal waters from Freeport to Matagorda Ship Channel TX out
20 NM-Coastal waters from High Island to Freeport TX out 20 NM-
Galveston Bay-Matagorda Bay-
Waters from Freeport to Matagorda Ship Channel TX from 20 to
60 NM-Waters from High Island to Freeport TX from 20 to 60 NM-
613 AM CDT Tue May 7 2019

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...Today and Tonight

Some showers and thunderstorms will be possible today, and could
produce heavy rainfall, gusty winds, and hail.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

A series of upper level disturbances will bring periods of showers
and thunderstorms to the area during the upcoming week. Some
storms could be strong with gusty winds, hail and periods of
heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Local storm report, May 7, 8:17 PM CDT, 3 hours 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
817 PM CDT TUE MAY 07 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0742 PM     LIGHTNING        PLANTERSVILLE           30.33N  95.86W
05/07/2019                   GRIMES             TX   BROADCAST MEDIA

            STRUCTURAL FIRE FROM LIGHTNING

&&

EVENT NUMBER HGX1900105

47
Local storm report, May 7, 8:20 PM CDT, 3 hours 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
820 PM CDT TUE MAY 07 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0814 PM     FLASH FLOOD      SUGAR LAND              29.62N  95.62W
05/07/2019                   FORT BEND          TX   COUNTY OFFICIAL

            ALL MAJOR ROADWAYS IMPASSABLE PER CITY OF SUGARLAND

&&

EVENT NUMBER HGX1900106

47
Local storm report, May 7, 9:01 PM CDT, 2 hours 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
901 PM CDT TUE MAY 07 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 PM     FLASH FLOOD      FRIENDSWOOD             29.51N  95.20W
05/07/2019                   GALVESTON          TX   NEWSPAPER

            STREET FLOODING

&&

EVENT NUMBER HGX1900107

47
Local storm report, May 7, 9:14 PM CDT, 2 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
914 PM CDT TUE MAY 07 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0913 PM     FLASH FLOOD      WEBSTER                 29.53N  95.12W
05/07/2019                   HARRIS             TX   NWS EMPLOYEE

            BAY AREA BLVD FLOODED

&&

EVENT NUMBER HGX1900108

47
Local storm report, May 7, 11:13 PM CDT, 24 minutes before
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Local storm report, May 7, 11:15 PM CDT, 22 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 7:10 PM CDTAreal Flood AdvisoryHGXBrazoria, Chambers, Fort Bend, Galveston, Harris3 hr
May 7, 7:31 PM CDTFlash Flood WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris3 hr
May 7, 7:39 PM CDTAreal Flood WarningHGXHarris, Liberty, Montgomery3 hr
May 7, 7:51 PM CDTRiver Flood WarningHGXHarris5 hr
May 7, 7:51 PM CDTRiver Flood WarningHGXHarris4 hr
May 7, 7:55 PM CDTAreal Flood AdvisoryHGXAustin, Brazoria, Colorado, Fort Bend, Matagorda, Wharton3 hr
May 7, 8:02 PM CDTFlash Flood WatchHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Wharton6 hr
May 7, 8:12 PM CDTSpecial Weather StatementHGXHarris48 min
May 7, 8:42 PM CDTAreal Flood AdvisoryHGXBrazoria, Galveston, Harris3 hr
May 7, 9:17 PM CDTAreal Flood WarningHGXFort Bend, Harris118 min
May 7, 9:24 PM CDTRiver Flood WarningHGXFort Bend6 days
May 7, 9:40 PM CDTRiver Flood WarningHGXHarris3 hr
May 7, 9:45 PM CDTFlash Flood WarningHGXBrazoria, Galveston, Harris2 hr
May 7, 10:09 PM CDTRiver Flood WarningHGXBrazoria10 days
May 7, 10:09 PM CDTRiver Flood WarningHGXBrazoria, Fort Bend, Wharton11 days
May 7, 10:09 PM CDTRiver Flood WarningHGXHarris, Montgomery4 hr
May 7, 10:26 PM CDTFlash Flood WarningHGXAustin, Brazoria, Colorado, Fort Bend, Harris, Wharton3 hr
May 7, 10:32 PM CDTAreal Flood WarningHGXHarris, Liberty, Montgomery15 hr
May 7, 10:37 PM CDTFlash Flood WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris3 hr
May 7, 10:50 PM CDTRiver Flood WarningHGXHarris4 hr
May 7, 11:52 PM CDTAreal Flood WarningHGXBrazoria, Galveston6 hr
May 8, 1:32 AM CDTAreal Flood WarningHGXAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 2 more6 hr
May 8, 6:19 AM CDTRiver Flood WarningHGXAustin, Colorado, Fort Bend, Wharton6 days
May 8, 6:23 AM CDTRiver Flood WarningHGXHarris27 hr
May 8, 7:26 AM CDTAreal Flood WarningHGXAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 2 more6 hr
May 8, 10:23 AM CDTSmall Craft AdvisoryHGX18 hr
May 8, 1:14 PM CDTSpecial Weather StatementHGXBurleson31 min
May 8, 1:41 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Madison49 min
May 8, 1:48 PM CDTTornado WarningHGXBrazos, Madison42 min
May 8, 2:03 PM CDTTornado WarningHGXBrazos, Burleson27 min
May 8, 2:26 PM CDTTornado Warning Tornado observedHGXBrazos, Grimes34 min
May 8, 2:29 PM CDTSevere Thunderstorm WarningHGXBrazos, Grimes, Montgomery, Walker46 min
May 8, 2:33 PM CDTSpecial Weather StatementHGXHouston, Trinity42 min
May 8, 3:17 PM CDTSpecial Weather StatementHGXTrinity13 min
May 8, 3:27 PM CDTSpecial Weather StatementHGXBrazos33 min
May 8, 3:56 PM CDTSpecial Weather StatementHGXMadison49 min
May 8, 4:02 PM CDTSpecial Weather StatementHGXBurleson58 min
May 8, 4:24 PM CDTSpecial Weather StatementHGXTrinity36 min
May 8, 5:47 PM CDTSpecial Weather StatementHGXMontgomery28 min

Nearby

Flash Flood Warnings in Texas, 2019Every flash flood warning in 2019

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.