Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 19, NWS Houston/Galveston, TX

April 17, 2015Fort Bend County, Wharton County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Apr 17, 2015, 10:12 PM CDT for Fort Bend County, Wharton County, Texas. It was in force for 63 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: Apr 17, 2015, 10:12 PM CDT (03:12 UTC)
Expired: Apr 17, 2015, 11:15 PM CDT
In force: 63 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

Counties Fort Bend County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 89 km from the middle of the area, began a volume at 03:15 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 00:00Z, 3.2 hours before the alert went out and 228 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: 1803 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 771 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.1

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 Apr 17, 9:38 PM CDT, 34 minutes earlier.

Area forecast discussion, Apr 17, 9:38 PM CDT, 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
938 PM CDT FRI APR 17 2015

.UPDATE...
JUST A QUICK UPDATE TO CLEAN UP IN WAKE OF BOWING MCS FINALLY
CLEARING THE AREA. SITUATION REMAINS ACTIVE WITH MOIST SW FLOW AND
MAIN UPPER LOW REMAINING OFF TO THE WEST. THIS WILL KEEP SCATTERED
TSTMS IN THE FORECAST OVERNIGHT AND THROUGH TOMORROW AT LEAST.
FLASH FLOODING NOW GREATEST CONCERN WITH MANY AREAS INUNDATEDLATE
THIS EVENING...AND BAYOUS AND CREEKS RISING. ANY FURTHER RAINFALL
WILL CERTAINLY AGGRAVATE THE SITUATION. SURFACE OUTFLOW/EFFECTIVE
FRONT HAS PUSHED OFF THE COAST...HOWEVER ELEVATED STORMS WITH RAIN
AND HAIL REMAIN A CONCERN. SVR TSTM WATCH THEREFORE WILL REMAIN IN
EFFECT ALONG COAST AND ONE ROW OF COUNTIES INLAND THROUGH 07Z.
TORNADO WATCH FOR JACKSON AND MATAGORDA ALSO REMAINS POSTED
THROUGH 07Z AS THIS AREA WILL REMAIN CLOSER TO THE SURFACE BASED
INSTABILITY LINGERING NEAR THE CENTRAL TX COAST. FLASH FLOOD WATCH
WILL ALSO REMAIN IN PLACE AREA WIDE THROUGH AT LEAST TOMORROW.

EVANS

&&

.PREV DISCUSSION... /ISSUED 634 PM CDT FRI APR 17 2015/

AVIATION...
SHRA/TSRA DEVELOPING ACROSS SE TX EARLY THIS EVENING. EXPECTING ALL
TAF SITE TO SEE TSRA WITHIN THE NEXT FIVE HOURS (23Z-04Z) AS THE STORM
COMPLEX MOVES EASTWARD THROUGH THE AREA. MVFR CEILINGS ARE LIKELY WITH
THE ACTIVITY...AND IFR CEILINGS/VISIBILITIES ARE POSSIBLE WITH THE
STRONGER TSRA. IT IS POSSIBLE THIS COULD EXTEND PAST 04Z...ESPECIALLY
FROM IAH SOUTHWARD TO GLS. SOME STABILIZATION COULD OCCUR DURING THE
OVERNIGHT HOURS AND TOWARD MORNING...AND WITH DAYTIME HEATING TOMORROW
WOULD EXPECT TO SEE MORE PERIODS OF SHRA/TSRA.  42

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      66  78  63  83  59 /  80  60  20  20  10
HOUSTON (IAH)              68  79  65  84  63 /  90  60  20  20  20
GALVESTON (GLS)            71  78  70  78  68 /  80  60  30  20  20

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...FLASH FLOOD WATCH UNTIL 8 AM CDT SATURDAY FOR THE FOLLOWING
     ZONES: AUSTIN...BRAZORIA...BRAZOS...BURLESON...CHAMBERS...
     COLORADO...FORT BEND...GALVESTON...GRIMES...HARRIS...
     HOUSTON...JACKSON...LIBERTY...MADISON...MATAGORDA...
     MONTGOMERY...POLK...SAN JACINTO...TRINITY...WALKER...
     WALLER...WASHINGTON...WHARTON.

GM...NONE.

&&

Hazardous weather outlook, Apr 17, 9:48 PM CDT, 24 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
948 PM CDT FRI APR 17 2015

GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-
227-235>238-190300-
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-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON-
948 PM CDT FRI APR 17 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TONIGHT

SEVERE THUNDERSTORM WATCH IN EFFECT THROUGH 2 AM CDT TONIGHT FOR
COASTAL COUNTIES AND ONE ROW INLAND.

A FLOOD WATCH IS IN EFFECT AREA WIDE THROUGH SATURDAY MORNING.

ONGOING FLOODING THIS EVENING WILL BE AGGRAVATED BY SCATTERED
THUNDERSTORMS EXPECTED TO CONTINUE OVERNIGHT. ONE TO TWO INCH
RAINS COULD OCCUR WITH HEAVIER CORES...ALONG WITH HAIL UP TO AN
INCH IN DIAMETER.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

STRONG TO SEVERE THUNDERSTORMS WITH HEAVY RAIN WILL BE POSSIBLE
AGAIN SATURDAY AS YET ANOTHER DISTURBANCE MOVES THROUGH THE REGION.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS NEED TO BE READY TO REPORT ANY SEVERE WEATHER DURING THE
OVERNIGHT HOURS.

In the hours before

Local storm report, Apr 17, 9:37 PM CDT, 35 minutes before

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Local storm report, Apr 17, 9:38 PM CDT, 34 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Local storm report, Apr 17, 9:42 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
942 PM CDT FRI APR 17 2015

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

0925 PM     FLOOD            LA PORTE                29.67N  95.04W
04/17/2015                   HARRIS             TX   PUBLIC

            APPROXIMATELY 40 FLOODED HOMES IN LA PORTE.

&&

EVENT NUMBER HGX1500076

DCH

Local storm report, Apr 17, 9:44 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
944 PM CDT FRI APR 17 2015

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

0810 PM     TSTM WND DMG     JAMAICA BEACH           29.19N  94.98W
04/17/2015                   GALVESTON          TX   LAW ENFORCEMENT

            ESTIMATED 80 MPH TSTM WIND GUSTS IN JAMAICA
            BEACH...ROOF BLOWN OFF OF A HOME.

&&

EVENT NUMBER HGX1500077

DCH

Local storm report, Apr 17, 10:02 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1002 PM CDT FRI APR 17 2015

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

0740 PM     HAIL             ANGLETON                29.17N  95.43W
04/17/2015  E2.50 INCH       BRAZORIA           TX   AMATEUR RADIO

            EGG TO TENNIS BALL SIZED HAIL IN ANGLETON.

&&

EVENT NUMBER HGX1500078

DCH

Local storm report, Apr 17, 10:03 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1003 PM CDT FRI APR 17 2015

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

0558 PM     TSTM WND DMG     13 NNW EDNA             29.13N  96.76W
04/17/2015                   JACKSON            TX   LAW ENFORCEMENT

            TREES DOWN ON ROUTE 283 NEAR MORALES...ESTIMATED 50-60
            MPH WIND GUST.

0705 PM     TORNADO          10 W BAY CITY           28.98N  96.13W
04/17/2015                   MATAGORDA          TX   LAW ENFORCEMENT

            POSSIBLE BRIEF TORNADO TOUCHDOWN IN CLEMVILLE...10
            MILES WEST OF BAY CITY.

0740 PM     HAIL             ANGLETON                29.17N  95.43W
04/17/2015  E2.50 INCH       BRAZORIA           TX   AMATEUR RADIO

            EGG TO TENNIS BALL SIZED HAIL IN ANGLETON.

0744 PM     FLASH FLOOD      HOUSTON                 29.77N  95.39W
04/17/2015                   HARRIS             TX   AMATEUR RADIO

            MINOR STREET FLOODING AT SOUTH GESSNER AND BELFORT.

0748 PM     HAIL             OYSTER CREEK            29.00N  95.33W
04/17/2015  E1.00 INCH       BRAZORIA           TX   AMATEUR RADIO

            QUARTER SIZED HAIL AT OYSTER CREEK AND LANDERS.

0750 PM     HAIL             ANGLETON                29.17N  95.43W
04/17/2015  E1.00 INCH       BRAZORIA           TX   AMATEUR RADIO

            MULTIPLE QUARTER SIZED HAIL REPORTS AROUND ANGLETON.

0750 PM     TSTM WND DMG     ANGLETON                29.17N  95.43W
04/17/2015                   BRAZORIA           TX   LAW ENFORCEMENT

            CIRCUS TENT COLLAPSE AT THE ANGLETON
            FAIRGROUNDS...POLICE ON SCENE.

0757 PM     HAIL             DANBURY                 29.23N  95.35W
04/17/2015  E2.00 INCH       BRAZORIA           TX   AMATEUR RADIO

            2 INCH HAIL IN DANBURY AT SH 288 ALONG WITH ESTIMATED
            70 MPH WINDS.

0800 PM     HAIL             ANGLETON                29.17N  95.43W
04/17/2015  E1.00 INCH       BRAZORIA           TX   AMATEUR RADIO

            QUARTER SIZED HAIL AND 6 INCH TREE LIMBS DOWN DUE TO
            STRONG TSTM WINDS IN ANGLETON.

0805 PM     HAIL             IOWA COLONY             29.44N  95.42W
04/17/2015  E1.00 INCH       BRAZORIA           TX   AMATEUR RADIO

            QUARTER SIZED HAIL 2 MILES SOUTH OF IOWA COLONY.

0810 PM     TSTM WND DMG     JAMAICA BEACH           29.19N  94.98W
04/17/2015                   GALVESTON          TX   LAW ENFORCEMENT

            ESTIMATED 80 MPH TSTM WIND GUSTS IN JAMAICA
            BEACH...ROOF BLOWN OFF OF A HOME.

0823 PM     FLASH FLOOD      FRIENDSWOOD             29.51N  95.20W
04/17/2015                   GALVESTON          TX   NWS EMPLOYEE

            FRIENDSWOOD HIGH SCHOOL AREA HAS HIGH WATER RUNNING ON
            THE STREETS.

0829 PM     TSTM WND GST     HOUSTON                 29.77N  95.39W
04/17/2015  M61 MPH          HARRIS             TX   PUBLIC

            61 MPH 53 KNOT THUNDERSTORM WIND GUST AT HOUSTON HOBBY
            AIRPORT.

0830 PM     TSTM WND DMG     NASSAU BAY              29.55N  95.09W
04/17/2015                   HARRIS             TX   TRAINED SPOTTER

            LARGE TREE DOWN ALONG WITH NUMEROUS TREE LIMBS DOWN IN
            NASSAU BAY.

0840 PM     TSTM WND GST     FRIENDSWOOD             29.51N  95.20W
04/17/2015  E60 MPH          GALVESTON          TX   NWS EMPLOYEE

            ESTIMATED 60 MPH TSTM WIND GUST DURING 45-50 MPH
            SUSTAINED WINDS.

0848 PM     FLOOD            PASADENA                29.66N  95.15W
04/17/2015                   HARRIS             TX   PUBLIC

            FLOOD WATERS IN HOME ON SCARSDALE ROAD IN PASADENA.

0850 PM     FLASH FLOOD      HOUSTON                 29.77N  95.39W
04/17/2015                   HARRIS             TX   AMATEUR RADIO

            SOUTHBOUND FEEDER ROAD ALONG INTERSTATE 45 AT HOBBY
            AIRPORT IS IMPASSABLE DUE TO HIGH FLOODING WATER.

0905 PM     FLASH FLOOD      5 NNW WEBSTER           29.60N  95.15W
04/17/2015                   HARRIS             TX   NWS EMPLOYEE

            SOME IMPASSABLE STREETS IN THE CLEAR LAKE CITY
            NEIGHBORHOOD.

0905 PM     FLASH FLOOD      HOUSTON                 29.77N  95.39W
04/17/2015                   HARRIS             TX   FIRE DEPT/RESCUE

            HARRIS COUNTY FIRE DEPARTMENT CONDUCTING WATER RESCUES
            OF DRIVERS TRYING TO GO THROUGH HIGH WATER.

0905 PM     FLASH FLOOD      PASADENA                29.66N  95.15W
04/17/2015                   HARRIS             TX   FIRE DEPT/RESCUE

            NUMEROUS ROADS FLOODED IN PASADENA...REPORT FROM
            PASADENA FIRE DEPARTMENT.

0905 PM     FLASH FLOOD      HOUSTON                 29.77N  95.39W
04/17/2015                   HARRIS             TX   PUBLIC

            SPUR 527 OF HWY 59 DOWNTOWN HOUSTON IS IMPASSABLE.

0908 PM     FLASH FLOOD      BELLAIRE                29.70N  95.46W
04/17/2015                   HARRIS             TX   PUBLIC

            DISABLED AUTOMOBILES IN BELLAIRE.

0909 PM     HEAVY RAIN       PASADENA                29.66N  95.15W
04/17/2015  M3.60 INCH       HARRIS             TX   COUNTY OFFICIAL

            3.60 INCHES OF RAINFALL IN A 30 MINUTE PERIOD IN
            PASADENA...THIS EQUALS THE 500 YEAR RECORD RAINFALL
            RATE. REPORTED BY HARRIS COUNTY FLOOD CONTROL DISTRICT.

0925 PM     FLOOD            LA PORTE                29.67N  95.04W
04/17/2015                   HARRIS             TX   PUBLIC

            APPROXIMATELY 40 FLOODED HOMES IN LA PORTE.

&&

EVENT NUMBER HGX1500054 HGX1500055 HGX1500078 HGX1500056 HGX1500057
HGX1500058 HGX1500059 HGX1500060 HGX1500061 HGX1500062 HGX1500077
HGX1500064 HGX1500065 HGX1500071 HGX1500068 HGX1500066 HGX1500067
HGX1500069 HGX1500072 HGX1500073 HGX1500074 HGX1500075 HGX1500070
HGX1500076

DCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:20 PM CDT	Areal Flood Advisory	HGX	Austin, Colorado, Waller, Washington	3 hr
Apr 17, 7:37 PM CDT	Special Marine Warning	HGX		83 min
Apr 17, 7:37 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Galveston, Harris, Matagorda	38 min
Apr 17, 7:55 PM CDT	Flash Flood Warning	HGX	Brazoria, Chambers, Fort Bend, Galveston, Harris	3 hr
Apr 17, 8:01 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Chambers, Galveston, Harris, Matagorda	44 min
Apr 17, 8:25 PM CDT	Flash Flood Warning	HGX	Chambers, Galveston, Harris	3 hr
Apr 17, 8:40 PM CDT	Special Marine Warning	HGX		95 min
Apr 17, 8:43 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Galveston, Harris, Liberty	47 min
Apr 17, 8:50 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Galveston, Harris, Liberty	40 min
Apr 17, 8:51 PM CDT	River Flood Warning	HGX	Harris	61 hr
Apr 17, 8:55 PM CDT	Special Marine Warning	HGX		35 min
Apr 17, 9:09 PM CDT	Special Marine Warning	HGX		96 min
Apr 17, 9:21 PM CDT	Flash Flood Warning	HGX	Jackson, Wharton	54 min
Apr 17, 9:26 PM CDT	Special Marine Warning	HGX		64 min
Apr 17, 9:49 PM CDT	River Flood Warning	HGX	Harris	7 days
Apr 17, 10:54 PM CDT	River Flood Warning	HGX	Austin, Fort Bend, Wharton	5 days
Apr 17, 10:54 PM CDT	River Flood Warning	HGX	Brazoria, Fort Bend, Wharton	8 days
Apr 17, 10:54 PM CDT	River Flood Warning	HGX	Jackson	64 hr
Apr 17, 10:57 PM CDT	Flash Flood Warning	HGX	Brazoria, Fort Bend, Galveston, Harris	2 hr
Apr 17, 11:19 PM CDT	Flash Flood Warning	HGX	Austin, Fort Bend, Wharton	56 min
Apr 17, 11:29 PM CDT	Flash Flood Warning	HGX	Chambers, Harris	91 min
Apr 18, 1:23 AM CDT	Special Marine Warning	HGX		112 min
Apr 18, 3:15 AM CDT	Special Marine Warning	HGX		2 hr
Apr 18, 10:58 AM CDT	River Flood Warning	HGX	Matagorda, Wharton	42 hr
Apr 18, 11:33 AM CDT	River Flood Warning	HGX	Galveston, Harris	46 hr
Apr 18, 3:15 PM CDT	Special Weather Statement	HGX	Matagorda	45 min
Apr 18, 5:25 PM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris	50 min
Apr 18, 6:15 PM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris	60 min

Nearby

Flash Flood Warnings in Texas, 2015 Every 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.