Alert archive / Texas / Flash Flood Warnings in 1999
Flash Flood Warning 11, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Apr 3, 1999, 5:30 PM 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 3, 1999, 5:30 PM CST (23:30 UTC)
- Expired
- Apr 3, 1999, 8:30 PM CST
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Polk County, TX, San Jacinto County, TX
The radar
The Houston radar (KHGX), 135 km from the middle of the area, began a volume at 23:30 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.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.5 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
- 918 J/kg
- Mixed-layer CIN
- -357 J/kg
- Mixed-layer LCL
- 864 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
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, 3:25 PM CST, 2 hours 5 minutes earlier.
Area forecast discussion, Apr 3, 3:25 PM CST, 2 hours 5 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 325 PM CST SAT APR 3 1999 RATHER IMPRESSIVE LOOKING CONVECTION STARTING TO FIRE UP OVER PARTS OF THE FA THIS AFTERNOON. APPEARS THE EARLIER QUESTIONS RELATED TO CAP STRENGTH SEEM MOOT. WILL KEEP RAIN CHANCE ON THE HIGH SIDE FOR TONIGHT ALONG WITH THE MENTION OF SEVERE. LOOKING AHEAD...THE COM- PLICATED FORECASTS CONTINUE WITH GENERAL CONSENSUS OF NON AGREEMENT AMONG THE MODELS (ESPECIALLY FOR THE EXTENDED FCSTS). COMPOSITE OF AVN/NGM PROG TRENDS SEEM MOST REASONABLE FOR THE SHORT TERM AS THEY KEEP CLOUDS/POPS IN THRU MONDAY. SUBTROPICAL FLOW EXPECTED TO STAY ACTIVE WITH EMBEDDED S/W MOVING ACROSS WHILE ANOTHER UPPER LOW DIGS OFF THE ROCKIES. DEEP ONSHORE FETCH TO REDEVELOP TOMORROW, BUT THE BRUNT OF THIS NEXT SYSTEM SHOULD AFFECT SE TX MONDAY AT THE LATEST. ATTM...INDICATIONS ARE THAT THE AIRMASS WILL HAVE RECOVERED ENOUGH BY THEN FOR THE POSSIBILITY OF SOME STRONG TSRA. FOR TONIGHT THIS LATEST SYSTEM TO EXIT BY MIDNITE WITH SOME PARTIAL CLEARING POSSI- BLE...BUT THE PREVAILING CONDITIONS SHOULD BE MOSTLY CLOUDY ACROSS THE BOARD. NO REAL ARGUMENTS WITH GOING MOS TEMPS AS THEY SEEM TO FOLLOW PERSISTENCE ANYWAY. 41/45/DEB PRELIMS... CLL ET 058/077 065/079 3345 IAH ET 063/078 068/080 6345 GLS ET 068/076 069/077 6445 .HGX...SCA FOR ALL UPPER TX COAST.
In the hours before
Special weather statement, Apr 3, 1:00 PM CST, 4 hours 30 minutes before
TXZ163-040000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 100 PM CST SAT APR 3 1999 ...TORNADO WATCH IN EFFECT UNTIL 6 PM FOR HOUSTON COUNTY... A LINE OF THUNDERSTORMS ALONG THE DRYLINE PRODUCED AN OUTFLOW BOUNDARY THAT HAS BEEN SPEEDING EASTWARD. THIS OUTFLOW BOUNDARY WILL BE MOVING INTO A MOIST AND INCREASINGLY MORE UNSTABLE ATMOSPHERE. SUPERCELL THUNDERSTORMS MAY DEVELOP RAPIDLY...SPAWNING TORNADOES AND DAMAGING MICROBURST WINDS IN EXCESS OF 50 MPH. THESE THUNDERSTORMS WILL BE MOVING INTO WESTERN HOUSTON COUNTY AROUND 2 PM. THE MAIN THREATS WILL BE ISOLATED TORNADOES AND DAMAGING WINDS...BRIEF HEAVY RAINFALL WILL ALSO BE POSSIBLE. THE WATCH AREA EXTENDS GENERALLY ALONG AND NORTHEAST OF A LINE FROM FAIRFIELD TO NACOGDOCHES. STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS SOURCES FOR THE LATEST STATEMENTS OR WARNINGS.
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 2:07 PM CST | Severe Thunderstorm Warning | HGX | Colorado | 38 min |
| Apr 3, 3:00 PM CST | Tornado Warning | HGX | Montgomery, Walker | 30 min |
| Apr 3, 3:44 PM CST | Tornado Warning | HGX | Polk, San Jacinto, Trinity | 61 min |
| Apr 3, 3:56 PM CST | Severe Thunderstorm Warning | HGX | Montgomery | 64 min |
| Apr 3, 4:01 PM CST | Tornado Warning | HGX | Montgomery | 29 min |
| Apr 3, 4:38 PM CST | Severe Thunderstorm Warning | HGX | Polk, San Jacinto | 67 min |
| Apr 3, 5:45 PM CST | Severe Thunderstorm Warning | HGX | Polk, San Jacinto | 45 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; radar from the NEXRAD Level II archive.