Flash Flood Warning 12, NWS Houston/Galveston, TX

Issued

Aug 15, 2002, 3:47 AM CDT (08:47 UTC)

Expired

Aug 15, 2002, 5:45 AM CDT

In force

118 min

Issued by

NWS Houston/Galveston, TX

Area

Counties, with a storm outline in the text

Counties Brazoria County, TX, Galveston County, TX

The Houston radar (KHGX), 19 km from the middle of the area, began a volume at 08:50 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 150847
FFWHOU
TXC039-167-151045-

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

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN BRAZORIA COUNTY IN SOUTHEAST TEXAS
  SOUTHERN GALVESTON COUNTY IN SOUTHEAST TEXAS

* UNTIL 545 AM CDT

* AT 335 AM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL 
CONTINUING TO TRAIN EAST NORTHEAST ACROSS SOUTHERN BRAZORIA AND 
GALVESTON COUNTIES. MOST OF THE AREA HAS PROBABLY SEEN 2 TO 3 INCHES 
SINCE 230 AM AND ANOTHER 2 TO 4 INCHES IS POSSIBLE. AN OBSERVER AT 
JAMAICA BEACH REPORTED 1.4 INCHES OF RAIN IN 15 MINUTES. RATES LIKE 
THAT WILL NOT BE UNCOMMON IN THE NEXT FEW HOURS AND WILL LEAD TO 
FLASH FLOODING.

* FLOODING IS EXPECTED IN OR NEAR...
  FREEPORT...GALVESTON ISLAND...SAN LUIS PASS...TIKI ISLAND...TEXAS 
CITY...SANTA FE...ANGLETON...LAKE JACKSON

DO NOT CROSS ANY LOCATION WHERE WATER COVERS THE ROAD
USE EXTRA CAUTION AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DEPTH 
AND SPEED OF FLASH FLOOD WATERS.

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 2957 9483 2948 9474 2951 9439 2881 9537
          2909 9562

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Aug 15, 2:50 AM CDT, 57 minutes earlier.

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

WIDESPREAD SHWRS AND TSTMS OCCURRING EARLY THIS AM ALONG COASTAL
ZONES AND OFFSHORE EAST OF MID/UPPER LEVEL TROF AXIS WHICH IS
SHIFTING EAST INTO FA.

MAIN FORECAST CONCERN IS 1ST PD POPS AS THERE IS LIKELY TO BE A
DECENT GRADIENT TODAY ACROSS INLAND ZONES. HAVE DECIDED TO TREND
FORECAST WITH A COMPROMISE OF AVN/ETA PRECIP FIELDS. HOWEVER...COULD
MAKE SOME LAST MINUTE ADJUSTMENTS BASED ON RADAR TRENDS LATER THIS
MORN. BELIEVE SHWRS/TSTMS WILL BE ONGOING TO START THE DAY ACROSS
COASTAL ZONES AND PORTIONS OF CENTRAL ZONES. WILL TAPER POPS WITH
EXPECTED PW FIELD WITH 2+ INCHES ACROSS CENTRAL AND COASTAL ZONES
AND LESS THAN 2 INCHES ACROSS N/NW ZONES. WILL ALSO MENTION HEAVY
RAIN IN ALL BUT N/NW ZONES. LIKELY TO SEE AVERAGE AMOUNTS OF 1 TO 2
INCHES WITH ISOLATED 3 TO 5 INCH AMOUNTS ALONG AND SE OF AN EL CAMPO
TO HOUSTON TO CLEVELAND LINE. WILL KEEP LOW CHC POPS FOR 2ND
PERIOD ACROSS THIS AREA...BUT HEAVY RAIN THREAT SHOULD SHIFT NE
OF AREA LATE THIS AFTERNOON AND EVENING.

WILL CONTINUE TO ADVERTISE A DECREASE IN POPS FOR FRIDAY. HOWEVER...
THINK WITH MID-LEVEL WEAKNESS OVER FORECAST AREA WHICH IS SANDWICHED
BETWEEN WEST COAST RIDGE AND BERMUDA HIGH WILL STILL SEE SCT
CONVECTION WITH HEATING FOR ALL BUT N/NW ZONES...SO WILL FORECAST
SLIGHTLY HIGHER THAN GUIDANCE. WILL KEEP CHC ON SAT BUT LOWER TO
SLIGHT CHC ON SUN AS HEIGHTS RISE OVER AREA AND LIKELY TO SEE MORE
SYNOPTIC SCALE SUBSIDENCE FROM RIDGE TO THE WEST.

HIGH TEMPS TODAY AT MOST LOCATIONS SHOULD BE BELOW GUIDANCE NUMBERS
GIVEN EXPECTED PRECIP AND CLOUDS. THE TOUGH AREA WILL BE THE NW
ZONES WHERE SOME HEATING WILL LIKELY OCCUR.

FOR MARINE AREA...WILL KEEP ADVISORY FOR GULF WATERS FOR SEAS AND
HAVE CAUTION MENTIONED FOR BAYS TODAY.

33/47

.HGX....SCA GULF WATERS AND SCEC BAYS

PRELIMS...
CLL EB 092/076 094/075 095 423
IAH TB 088/076 092/076 094 734
GLS TB 086/080 088/080 089 +44
SW COAST                   834

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.