Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 36, NWS Houston/Galveston, TX

September 8, 2002Harris County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Sep 8, 2002, 1:25 PM CDT for Harris 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 8, 2002, 1:25 PM CDT (18:25 UTC)
Expired
Sep 8, 2002, 4:15 PM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Counties, with a storm outline in the text

County Harris County, TX

The radar

The Houston radar (KHGX), 31 km from the middle of the area, began a volume at 18:26 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, 6.4 hours before the alert went out and 195 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 12:00Z on 2002-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 780 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 12:00Z on 2002-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 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
780 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
572 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KHGX 081825
FFWHOU
TXC201-082115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
125 PM CDT SUN SEP 8 2002

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HARRIS COUNTY IN SOUTHEAST TEXAS

* UNTIL 415 PM CDT

* AT 120 PM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL 
CONTINUED TO FALL OVER EASTERN HARRIS COUNTY. ANOTHER 1 TO 2 INCHES 
OF RAIN IS POSSIBLE BY 3 PM. 

FLOODING WAS REPORTED NEAR RED BLUFF AND FAIRMONT IN PASADENA AND 
THE INTERSECTION OF CENTER STREET AND P STREET WAS UNDER WATER IN 
DEER PARK. 

* FLOODING IS EXPECTED IN OR NEAR...
  DEER PARK...SHELDON...PASADENA...JACINTO CITY

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 2972 9526 2957 9514 2979 9501 2990 9521

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 8, 9:45 AM CDT, 3 hours 40 minutes earlier.

Area forecast discussion, Sep 8, 9:45 AM CDT, 3 hours 40 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
945 AM CDT SUN SEP 8 2002

A LARGE AREA OF SHRA/TSRA ONGOING THIS MORNING. SEVERAL OF THE
STORMS HAVE SHOWN SIGNS OF ROATATION. MORNING SOUNDINGS SHOW PWS
AOA 2.3 INCHES...K INDICES IN THE UPPER 30S AND HELICITY VALUES
150-200. 13Z ANALYSIS SHOWS A WEAK SFC BOUNDARY DRAPED ACROSS THE
REGION VCT TO LFT AND SFC STREAMLINES SHOW STRONG CONFLUENCE ACROSS
SE TX. 85H DEW PTS ARE 16 C AND 85H WINDS ARE SLIGHTLY CONFLUENT AS
WELL. BEST 85H INFLOW LIES ALONG A LCH TO OUN LINE. IR IMAGERY
REVEALS A NICE FETCH OF MSTR LINING UP FROM CHAMBERS COUNTY
SOUTHEAST INTO THE GULF. THIS AREA OF MSTR LOOKS LIKE IT WILL STREAM
INLAND AND AFFECT THE NE ZONES LATER THIS AFTERNOON. NO CHANGES TO
CURRENT FORECAST. MAYBE AN UPDATE LATER IF MESO-BNDRYS WREAK HAVOC.

43/47

.HGX...FLASH FLOOD WATCH THROUGH TONIGHT.
       SCA GULF WATERS.

PRELIMS...
CLL TT 086/075 088/074 091 874
IAH TT 085/076 087/075 089 976
GLS TT 085/080 086/080 086 965

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 9:00 AM CDTSpecial Marine WarningHGX30 min
Sep 8, 9:33 AM CDTSpecial Marine WarningHGX57 min
Sep 8, 9:47 AM CDTFlash Flood WarningHGXLiberty118 min
Sep 8, 11:35 AM CDTFlash Flood WarningHGXLiberty3 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.