Flash Flood Warning 20, NWS Houston/Galveston, TX

Issued

Aug 15, 2002, 3:47 PM CDT (20:47 UTC)

Expired

Aug 15, 2002, 6:00 PM CDT

In force

2 hr

Issued by

NWS Houston/Galveston, TX

Area

Counties, with a storm outline in the text

Counties Waller County, TX, Washington County, TX

The Houston radar (KHGX), 130 km from the middle of the area, began a volume at 20:47 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.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WGUS54 KHGX 152047
FFWHOU
TXC473-477-152300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
350 PM CDT THU AUG 15 2002

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WASHINGTON COUNTY IN SOUTHEAST TEXAS
  WALLER COUNTY IN SOUTHEAST TEXAS

* UNTIL 600 PM CDT

* AT 345 PM CDT...DOPPLER RADAR INDICATED ONLY LIGHT TO MODERATE 
RAIN OVER WASHINGTON AND WALLER COUNTIES. HOWEVER...8 TO 12 INCHES 
OF RAIN HAS FALLEN OVER THIS AREA TODAY AND FLOODING WILL CONTINUE 
FOR THE NEXT FEW HOURS. ABOUT 4 INCHES OF RAIN HAS FALLEN FROM 
BRENHAM TO HEMPSTEAD BETWEEN NOON AND 3 PM. ANOTHER HALF TO ONE INCH 
OF RAIN IS EXPECTED BY 6 PM.

* FLOODING IS EXPECTED IN OR NEAR...
  HEMPSTEAD

DO NOT CROSS ANY LOCATION WHERE WATER COVERS THE ROAD

PLEASE REPORT FLOODING TO THE COUNTY SHERIFF...LOCAL POLICE...OR
DEPARTMENT OF PUBLIC SAFETY. THEY WILL RELAY YOUR REPORT TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 3024 9647 3011 9607 2986 9599 3017 9597

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Aug 15, 2:05 PM CDT, 1 hour 42 minutes earlier.

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
205 PM CDT THU AUG 15 2002

FAIRLY SIGNIFICANT FLOOD EVENT UNDERWAY OVR THE CWA. RAINFALL UP TO
11+ INCHES AT GLS. WIDESPREAD STREET FLOODING RESULTING IN SOME
ROAD CLOSURES. ALSO EARLIER REPORTS OF WATER IN HOUSES AND
BUSINESSES IN HOUSTON AND GALVESTON.

MODELS HAVE BEEN OVERLY AGGRESSIVE TRYING TO PULL THE MOISTURE AND
LIFT OUT OF THE AREA. WILL SLOW DOWN THE HEAVY RAIN EXITING TONIGHT.
WILL KEEP FFA UP UNTIL MIDNIGHT. BEST ACTIVITY SHOULD BE OUT BY
THEN. ONLY PROBLEM IS...ANY REDEVELOPMENT OVERNIGHT...EVEN MODERATE
...COULD BE ENOUGH TO AGGRAVATE ONGOING FLOODING. BACK EDGE OF HVY
RAIN HAS ACTUALLY SHIFTED SW DRG THE DAY. LOW CONFIDENCE IN SHORT
TERM MODEL OUTPUT AS A RESULT.

TEMPS SHOULD HOLD ABT WHERE THEY ARE E OF THE BACK EDGE OF THE
PRECIP. WILL FEATURE STEADY TEMPS MOST ZONES TNGT EXCEPT SW.

H5 TROF AXIS REMAINS IN PLACE TNGT INTO FRI...THO IT WEAKENS. PW
VALUES STILL PROGGED AOA 2 ERN ZONES BY LATE TMRW...AND ONLY LOWERS
SLIGHTLY SATURDAY. WILL USE CHC POPS ALL ZONES FRI AND CHC IN THE E
SATURDAY. WILL CONT SLGT CHC ALL ZONES SUN THRU THU...BUT MAY HAVE TO
INCR IN SPOTS IF PRESENT TRENDS CONT IN THE AVN MODEL.

WINDS AND SEAS WARRANT FLAGS ON THE MARINE SIDE. NOT A GREAT DAY FOR
BOATING.

46/37/30/43/WT

.HGX....SCA GULF WATERS...SCEC BAYS.
        FLASH FLOOD WATCH UNTIL 05Z E OF COLORADO RVR.

PRELIMS...
CLL EB 071/090 075/094 075 542
IAH TB 071/089 075/092 075 552
GLS TB 075/087 079/088 079 552

Flash Flood Warnings in Texas, 2002Every flash flood warning in 2002

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.