Alert archive / Texas / Flash Flood Warnings in 2002
Flash Flood Warning 37, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Sep 9, 2002, 8:32 AM CDT for Brazoria 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
- Sep 9, 2002, 8:32 AM CDT (13:32 UTC)
- Expired
- Sep 9, 2002, 11:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Counties, with a storm outline in the text
County Brazoria County, TX
The radar
The Houston radar (KHGX), 47 km from the middle of the area, began a volume at 13:36 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.
Did it verify
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.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.5 hours before the alert went out and 239 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.
- Mixed-layer CAPE
- 1337 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 539 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS54 KHGX 091332 FFWHOU TXC039-091630- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 830 AM CDT MON SEP 9 2002 THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A * FLASH FLOOD WARNING FOR... BRAZORIA COUNTY IN SOUTHEAST TEXAS * UNTIL 1130 AM CDT * AT 830 AM CDT...3 TO 5 INCHES OF RAIN HAS FALLEN OVER SOUTHERN BRAZORIA COUNTY IN LAST SEVERAL HOURS. ANOTHER 1 TO 3 INCHES OF RAIN IS EXPECTED BY 10 AM. SURFSIDE POLICE REPORT WATER SEVERAL FEET DEEP ON AREA STREETS. FLOODED STREETS HAVE ALSO BEEN REPORTED IN FREEPORT. * FLOODING IS EXPECTED IN OR NEAR... SURFSIDE...FREEPORT...OYSTER CREEK...HOLIDAY LAKES...DANBURY 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 2922 9562 2889 9532 2905 9517 2943 9535
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 Sep 9, 3:30 AM CDT, 5 hours 2 minutes earlier.
Area forecast discussion, Sep 9, 3:30 AM CDT, 5 hours 2 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
330 AM CDT MON SEP 9 2002
CONVECTIVE BANDS OF SHRA/TSRA OVER NW GULF MUCH WEAKER EARLY THIS
MORNING COMPARED TO 24 HRS AGO. HOWEVER...LOW LEVEL CONFLUENT FLOW
STILL EVIDENT W/DEEP ESE MOISTURE FEED. PWATS ABOUT 2.2 TO 2.4 OVER
CWFA. TIDE LEVELS RUNNING ABOUT 1-1.5 FT ABOVE NORMAL EARLY THIS MORNING
W/15-20 KTS ESE WINDS WITH HIGHER GUSTS. MODELS SHOWING A GRADUAL
RELAXING OF SURFACE PRESSURE GRADIENT LATER TODAY. HGX VAD WINDS
PAST SEVERAL HOURS INDICATING DECREASING OF WIND SPEEDS AT THE 925
MB LEVEL. WE WILL CANCEL COASTAL FLOOD WATCH SHORTLY AS INDICATIONS
ARE POINTING TO ONLY MARGINAL CONDITIONS AT WORSE.
UPPER LEVEL PATTERN STILL SHOWING DIFFLUENT FLOW (AT 200-300
MB LEVEL). REMNANTS OF FAY STILL LINGERING OVER MIDDLE RIO GRANDE
PLAINS. SPECIFICALLY...PWATS WILL GENERALLY BE LOWER OVER NE ZONES
TODAY W/LESS CONFLUENT FLOW AT LOWER LEVELS AND 850 MB ANALYSIS
SHOWS DEWPOINTS LOWER AT THAT REGION. MOISTURE RIDGE WILL REMAIN TO
THE SOUTHEAST...HENCE WILL ADJUST FLASH FLOOD WATCH FOR SOUTH OF A
COLDSPRING TO MADISONVILLE LINE. WINDS AND SEAS OVER COASTAL WATERS
HAS DROPPED BELOW SCA THRESHOLD BUT SHOULD REMAIN AT CAUTION STAGE
AT LEAST THROUGH TODAY. WILL CONTINUE SCEC FOR BAYS ALSO AT LEAST
THROUGH THE MORNING PERIOD.
UPPER LOW OVER YUCATAN MAY SHIFT TOWARDS CENTRAL PART OF THE
GULF BY MID WEEK AS MODELS AS HINTING. ANOTHER HYBRID DEVELOPMENT
POSSIBLE IF CYCLONIC FLOW AT LOWER LEVELS DEVELOP. WE SHALL SEE.
OUR CWFA SHOULD SEE A DRYING TREND THOUGH AS FLOW BECOMES MORE N-NE
RESULTING IN PROPAGATION OF LOWER DEWPOINTS BY MID WEEK. MEAN
100-500 MB RELATIVE HUMIDITIES DOWN TO ABOUT 50 PERCENT BY THEN.
PWATS DROPPING DOWN TO ABOUT 1.5 MIDWEEK WITH A GRADUAL RISE TO 1.7
INCHES BY FRIDAY. POSITIVELY TILTED MID LATITUDE UPPER TROUGH
INDICATED BY AVN TO FLATTEN UPPER RIDGE TO OUR WEST LATE THIS WEEK.
SUBTROPICAL RIDGE WILL PUSH TOWARDS GULF TOWARDS WEEKEND. IF MRF IS
CORRECT...A COLD FRONT MAY MAKE IT HERE ON MONDAY 3 DAYS BEFORE CLIMO.
37/45
.HGX...FLASH FLOOD WATCH SOUTH OF A COLDSPRING TO MADISONVILLE LINE.
SCEC GULF WATERS.
PRELIMS...
CLL TE 086/073 090/072 092 844
IAH TE 086/074 090/072 092 844
GLS TE 086/079 088/078 089 844The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 9:08 AM CDT | Special Marine Warning | HGX | 2 hr |
Nearby
Flash Flood Warnings in Texas, 2002Every flash flood warning in 2002
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.