Alert archive / Texas / Flash Flood Warnings in 1998
Flash Flood Warning 48, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Sep 11, 1998, 2:03 AM CDT for Brazoria County, Fort Bend County, Harris County, Texas. It was in force for 4 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
- Sep 11, 1998, 2:03 AM CDT (07:03 UTC)
- Expired
- Sep 11, 1998, 6:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties
Counties Brazoria County, TX, Fort Bend County, TX, Harris County, TX
The radar
The Houston radar (KHGX), 44 km from the middle of the area, began a volume at 07:04 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 00:00Z, 7.1 hours before the alert went out and 235 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
- 26 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 452 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 273 m²/s²
- 0-3 km storm-relative helicity
- 445 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KHOU 110703 FFWHOU TXC039-157-201-111100- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 203 AM CDT FRI SEP 11 1998 THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A * FLASH FLOOD WARNING FOR... BRAZORIA COUNTY IN SOUTHEASTERN TEXAS FORT BEND COUNTY IN SOUTHEASTERN TEXAS HARRIS COUNTY IN SOUTHEASTERN TEXAS * UNTIL 600 AM CDT * AT 155 AM CDT... NATIONAL WEATHER SERVICE RADAR INDICATED A THUNDERSTORMS WITH VERY HEAVY RAIN FROM THE WESTERN END OF FORT BEND COUNTY...ACROSS HARRIS COUNTY...AND FROM NORTHERN BRAZORIA COUNTY TO THE SOUTHEAST ALONG THE BRAZORIA-GALVESTON COUNTY LINE TOWARD THE COAST... MOVING NORTHWEST AT 30 MPH. * STRONG SHOWERS AND THUNDERSTORMS WITH RAINFALL RATES OF UP TO 2 TO 3 INCHES PER HOUR WILL STRETCH ACROSS THE WARNED AREA. THESE RAINS WILL OCCUR OVER LOCATIONS THAT ALREADY RECEIVED HEAVY RAINS ON THURSDAY AND WILL LIKELY LEAD TO FLAS:H FLOODING. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLASH FLOODING.
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 11, 1:30 AM CDT, 33 minutes earlier.
Area forecast discussion, Sep 11, 1:30 AM CDT, 33 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
130 AM CDT FRI SEP 11 1998
THE 1 AM UPDATE FROM TPC (NHC) POSITIONED T.S. FRANCES JUST 30 MILES
NE OF PORT ARANSAS. THE SFC AND BUOY REPORTS OVER THE PAST FEW
HOURS CONFIRM THAT THE STORM CENTER SHOULD MAKE LANDFALL WITHIN THE
NEXT HOUR OR SO...WITH THE 06Z SURFACE ANALYSIS SHOWING THE CENTER
JUST OFFSHORE AND THE 07Z SURFACE INDICATING THE CENTER JUST
ONSHORE. THE HEAVIEST RAIN BANDS CONTINUED TO MOVE ONSHORE OVER
SETX AND AM EXPECTING RAIN BANDS TO AFFECT THE FORECAST AREA
THROUGHOUT THE DAY FROM THE GULF.
THE ETA/NGM APPEAR TO BE FORECASTING THE MOVMENT OF THE STORM
WELL...THOUGH NOT THE POSITION OF THE LANDFALL OF THE STORM. LIKE
THE ETA AS COMPARED TO THE OTHER MODELS...ESPECIALLY SINCE THE AVN
REALLY LINGERS THE STORM OFFSHORE TOO LONG AND THE NGM CURLS THE
STORM CENTER ALMOST DUE SOUTH IN THE LATER PERIODS. THE STORM LOOKS
TO BE FINALLY CAUGHT UP IN THE CIRCULATION AROUND THE 500 MB HIGH
LOCATED OVER THE CENTRAL PORTON OF THE COUNTRY. THE ETA FORECASTS
THIS HIGH TO BUILD SOUTH INTO SETX...PUSHING FRANCES WELL WEST OF
THE FORECAST AREA BY LATE TONIGHT. A STRONG PRESSURE GRADIENT
BETWEEN THE LOW AND THE SURFACE HIGH TO THE NE WILL CONTINUE TO KEEP
EASTERLY WINDS OVER THE COASTAL AREAS THROUGH TONIGHT AND SATURDAY.
THREATS FOR THE FIRST PERIOD INCLUDE HEAVY RAINFALL AND THE RELATED
FLASH FLOOD THREAT...AND POSSIBLE TORNADOES WITH THE RAINBANDS.
WILL KEEP THE FLASH FLOOD WATCH IN EFFECT TODAY. WILL ALSO NEED A
WIND ADVISORY IN THE COUNTIES OUTSIDE THE TROPICAL STORM WARNING.
THE COASTAL FLOODING THREAT WILL CONTINUE INTO TONIGHT...AS THE
STORM CONTINUES MOVING WELL INLAND AND THE PRESSURE GRADIENT
DECREASES THE TIDES SHOULD SLOWLY SUBSIDE.
AM EXPECTING TEMPERATURES TODAY TO BE A BIT BELOW THE FWC. IN THE
LATTER PERIODS WILL GO CLOSER TO THE MOS GUIDANCE. PL/40
PRELIMS...
CLL T/E E/B 82/75 90/74 9532 1ST PD...WND 20-30 GUSTY/FFA/WND ADV
NE T/C >B/B 80/75 87/75 9422 1ST PD...WND 20-30 GUSTY/FFA/WND ADV
IAH T/W E/B 80/76 90/75 9732 1ST PD...WND 20-30G40 /FFA/WND ADV
2ND PD...WND 10-20 AND GUSTY
GLS T/W E/B 82/77 87/79 9753 1ST PD...WND 25-35G45 AND FFA
2ND PD...WND 15-25G30The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 7:13 PM CDT | Flash Flood Warning | HGX | Galveston | 4 hr |
| Sep 10, 8:02 PM CDT | Tornado Warning | HGX | Brazoria, Galveston | 63 min |
| Sep 10, 10:09 PM CDT | Flash Flood Warning | HGX | Brazoria, Matagorda, Wharton | 4 hr |
| Sep 10, 10:09 PM CDT | Flash Flood Warning | HGX | Fort Bend | 4 hr |
| Sep 11, 12:09 AM CDT | Flash Flood Warning | HGX | Galveston | 4 hr |
| Sep 11, 1:29 AM CDT | Tornado Warning | HGX | Galveston, Harris | 66 min |
| Sep 11, 3:31 AM CDT | Tornado Warning | HGX | Galveston | 64 min |
| Sep 11, 4:01 AM CDT | Flash Flood Warning | HGX | Galveston | 4 hr |
| Sep 11, 4:31 AM CDT | Tornado Warning | HGX | Harris | 64 min |
| Sep 11, 4:39 AM CDT | Flash Flood Warning | HGX | Jackson | 4 hr |
| Sep 11, 5:32 AM CDT | Flash Flood Warning | HGX | Grimes, Montgomery, Waller | 4 hr |
| Sep 11, 5:54 AM CDT | Flash Flood Warning | HGX | Harris | 4 hr |
| Sep 11, 6:06 AM CDT | Tornado Warning | HGX | Fort Bend | 64 min |
| Sep 11, 6:18 AM CDT | Tornado Warning | HGX | Harris | 62 min |
| Sep 11, 7:49 AM CDT | Flash Flood Warning | HGX | Brazoria, Galveston | 4 hr |
| Sep 11, 7:49 AM CDT | Flash Flood Warning | HGX | Fort Bend | 4 hr |
| Sep 11, 8:58 AM CDT | Flash Flood Warning | HGX | Harris | 6 hr |
Nearby
Flash Flood Warnings in Texas, 1998Every flash flood warning in 1998
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.