Alert archive / Texas / Flash Flood Warnings in 1999
Flash Flood Warning 13, NWS Houston/Galveston, TX
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 8:36 PM CST | Flash Flood Warning | HGX | Polk, San Jacinto | 3 hr |
| Apr 4, 3:50 PM CDT | Severe Thunderstorm Warning | HGX | Houston | 40 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.