Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 13, NWS Houston/Galveston, TX

April 4, 1999Polk County, San Jacinto County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Apr 4, 1999, 12:30 AM CST for Polk County, San Jacinto 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 counties it named.

The facts

Issued
Apr 4, 1999, 12:30 AM CST (06:30 UTC)
Expired
Apr 4, 1999, 4:30 AM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

Counties Polk County, TX, San Jacinto County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.5 hours before the alert went out and 184 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 00:00Z on 1999-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 728 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 00:00Z on 1999-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.19395878Sfc1 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
728 J/kg
Mixed-layer CIN
-290 J/kg
Mixed-layer LCL
1318 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 3, 9:00 PM CST, 3 hours 30 minutes earlier.

Area forecast discussion, Apr 3, 9:00 PM CST, 3 hours 30 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
900 PM CST SAT APR 3 1999

RECENT SFC ANALYSES SHOW THE DRYLINE/COLD FRONT BOUNDARY FROM LRD
TO HDO TO JUST WEST OF HOU TO NEAR BPT THEN LFK. KHGX CONTINUES TO
SHOW MODERATE TO HEAVY RAIN FROM JAPSER AND NEWTON COUNTIES SWWRD TO
HARRIS COUNTY. RADAR ESTIMATES AND SPOTTER REPORTS INDICATE 2 TO 5
INCHES OVER POLK AND SAN JACINTO COUNTIES SINCE LATE AFTERNOON.

THE MAIN UPDATE ISSUE IS ASSESSING CONVECTION FOR THE REMAINDER OF
THE NIGHT. THE IAH MAPS SOUNDINGS ARE MUCH DIFFERENT FROM THE CAPPED
AND DRY LOWER LEVELS OF CRP AND LCH. THE IAH SOUNDINGS INDICATE
PRECIPITABLE WATER AROUND 1.80 INCHES...LI OF -7...AND CAPE AROUND
1650 J/KG. THE HODOGRAPH IS STRAIGHT-LINE WITH VERY LITTLE SPEED IN
THE LOWEST 3 KM...AND THE WARM CLOUD DEPTH (>0C) IS NEAR 4.5 KM.
THE 00Z RUC INDICATES A DECREASE IN THICKNESS DIFFLUENCE AFTER
06Z...AND OVERALL REDUCTION IN INSTABILITY AS CAPPING DEVELOPS.
OTHER FACTORS TO CONSIDER ARE THE PROXIMITY AND NEARLY 90 DEGREE
INCIDENCE ANGLE OF THE MOIST MID-LEVEL FLOW AND THE BOUNDARY...AND
ANOTHER WEAK DISTURBANCE ALONG THE SUBTROPICAL JET MAY FIRE UP
ACTIVITY IN DEEP SOUTH TX LATER.

OVERALL...WILL GO WITH SEVERE THREAT ENDING AT 900 PM...AND HOLD OFF
ON AN FFA IN FAVOR OF HIGH POPS WITH HEAVY RAIN POSSIBLE MENTION FOR
THE NERN 1/4 OF THE CWA. OTHERWISE FOG AND LOW/NO POPS FOR MOST
EVERYWHERE ELSE.

.HGX...SCA 20 TO 50 NM OFFSHORE.

31/36

UPDATE PRELIMS...
CLL ET 056/077 065/079 062 034
IAH ET 064/078 068/080 064 834
GLS ET 068/076 069/077 068 844

In the hours before

Special weather statement, Apr 3, 9:05 PM CST, 3 hours 25 minutes before
TXZ163-164-177>179-198>200-212-213-040330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
905 PM CST SAT APR 3 1999

...TORNADO WATCH HAS EXPIRED FOR NORTHEASTERN SECTIONS OF SOUTHEAST
TEXAS...

THE TORNADO WATCH HAS EXPIRED FOR PORTIONS OF SOUTHEAST TEXAS.
SHOWERS AND THUNDERSTORMS CONTINUE TO PRODUCE MODERATE TO HEAVY RAIN
FROM NORTHERN FORT BEND AND BRAZORIA COUNTY NORTHEAST TO POLK AND
LIBERTY COUNTIES. ANALYSIS OF THE WIND CHANGE WITH ALTITUDE
INDICATES A GREATLY REDUCED THREAT FOR SEVERE WEATHER. HOWEVER...
HEAVY RAIN IS POSSIBLE THROUGH EARLY MORNING.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS SOURCES FOR THE LATEST
STATEMENTS OR POSSIBLE WARNINGS.
Special weather statement, Apr 3, 9:05 PM CST, 3 hours 25 minutes before
TXZ163-164-177>179-198>200-212-213-040330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
905 PM CST SAT APR 3 1999

...TORNADO WATCH HAS EXPIRED FOR NORTHEASTERN SECTIONS OF SOUTHEAST
TEXAS...

THE TORNADO WATCH HAS EXPIRED FOR PORTIONS OF SOUTHEAST TEXAS.
SHOWERS AND THUNDERSTORMS CONTINUE TO PRODUCE MODERATE TO HEAVY RAIN
FROM NORTHERN FORT BEND AND BRAZORIA COUNTY NORTHEAST TO POLK AND
LIBERTY COUNTIES. ANALYSIS OF THE WIND CHANGE WITH ALTITUDE
INDICATES A GREATLY REDUCED THREAT FOR SEVERE WEATHER. HOWEVER...
HEAVY RAIN IS POSSIBLE THROUGH EARLY MORNING.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS SOURCES FOR THE LATEST
STATEMENTS OR POSSIBLE WARNINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 8:36 PM CSTFlash Flood WarningHGXPolk, San Jacinto3 hr
Apr 4, 3:50 PM CDTSevere Thunderstorm WarningHGXHouston40 min

Nearby

Flash Flood Warnings in Texas, 1999Every flash flood warning in 1999

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.