Alert archive / Texas / Flash Flood Warnings in 2000
Flash Flood Warning 11, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at May 20, 2000, 4:59 AM CDT for Harris County, Liberty 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
- May 20, 2000, 4:59 AM CDT (09:59 UTC)
- Expired
- May 20, 2000, 8:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties
Counties Harris County, TX, Liberty County, TX
The radar
The Houston radar (KHGX), 59 km from the middle of the area, began a volume at 10:03 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, 10.0 hours before the alert went out and 183 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
- 701 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1188 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS54 KHGX 201004 FFWHGX TXC201-291-201300- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 459 AM CDT SAT MAY 20 2000 THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON TX HAS EXTENDED THE * FLASH FLOOD WARNING FOR... EASTERN HARRIS COUNTY IN SOUTHEAST TEXAS SOUTHERN LIBERTY COUNTY IN SOUTHEAST TEXAS * UNTIL 800 AM CDT * AT 456 AM CDT...RAINFALL WAS SLOWLY COMING TO AN END OVER THE FLASH FLOOD WARNING AREA. ADDITIONAL 1/4 TO 1/2 INCH AMOUNTS MAY OCCUR. THE PREVIOUS HEAVY RAINFALL OF 6 TO 9 INCHES IN EASTERN HARRIS COUNTY AND THE 12 TO 19 INCHES ACROSS SOUTHERN LIBERTY COUNTY WILL TAKE TIME TO RECEDE. * FLOODING IS EXPECTED TO CONTINUE IN EASTERN HARRIS AND SOUTHERN LIBERTY COUNTY...AREAS ESPECIALLY HARD HIT INCLUDE DAYTON... LIBERTY AND AMES. STAY AWAY FROM SMALL CREEKS...STREAMS...BAYOUS...UNDERPASSES...AND FEEDER ROADS. DO NOT CROSS ANY LOC;ATION 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.
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 May 20, 2:41 AM CDT, 2 hours 18 minutes earlier.
Area forecast discussion, May 20, 2:41 AM CDT, 2 hours 18 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 241 AM CDT SAT MAY 20 2000 A RATHER BUSY NIGHT HERE AT HGX. AS OF 06Z...IAH RECEIVED 6.87 INCHES OF RAIN (NEW 24 HR RAINFALL RECORD)...HOOKS AIRPORT RECEIVED 4.81 INCHES BUT THE BIG WINNER (LOSER) WAS LIBERTY WHICH RECEIVED 18.3 INCHES OF RAIN SINCE ABOUT 830 PM LAST NIGHT...AND STILL RAINING. IR IMAGERY SHOWS CLOUD TEMPS VERY COLD WITH A GRADUAL WARMING TREND NOTED. WV IMAGERY SHOWS UPPER LOW MOVING EAST AS UPSTREAM KICKER OFF THE WEST COAST PUSHES SE. AS THE UPPER LOW PUSHES EAST...BEST UPPER LEVEL DIVERGENCE WILL ALSO SHIFT EAST. CURRENT THINKING IS THAT THE MCS OVER THE REGION WILL PUSH OFFSHORE BY 10Z WITH PERIODS OF LIGHT TO MODERATE RAIN CONTINUING THROUGH THE MORNING. SUBSIDENCE IN THE WAKE OF THIS SYSTEM WILL STABILIZE THE ATMOSPHERE LATE THIS AFTERNOON AND TONIGHT. TEMPS TODAY WILL BE A BIT TRICKY DUE TO CONVECTIVE CLOUD DEBRIS. IF SKIES CLEAR TONIGHT... FOG PROBABLY A GOOD BET. WILL DROP FFA AS CONVECTION WANES BUT FLOODING/RIVER FLOODING WILL PERSIST. BE AWARE THAT AREAS NORTH OF I-10 FROM NORTHERN HARRIS TO LIBERTY COUNTY WILL LIKELY REMAIN DANGEROUS. SUNDAY IS A BIT TRICKY AS WELL. AT FIRST GLANCE...SUNDAY LOOKS FAIRLY DRY BUT THE ETA/AVN BRINGS A FAIRLY POTENT S/WV THROUGH THE REGION BETWEEN 18-00Z. FCST MDL SOUNDINGS INDICATE K INDICES AROUND 30 AND PWS BEGIN TO POOL AND INCREASE TO 1.5 TO 1.6 INCHES. SOUNDINGS ALSO SHOW THAT THE AREA IS UNCAPPED. THINK TSTM CHANCES WILL INCREASE SUNDAY AFTERNOON AS THIS NEXT S/WV APPROACHES. EXTENDED: RIDGE BUILDS INTO THE REGION AND EXPECT A BIT OF A DRYING TREND WITH WARMER TEMPERATURES. LOOKING AHEAD TO MEMORIAL DAY WEEKEND...AN UPPER LOW MOVES TOWARD TEXAS WITH INCREASING RAIN CHANCES SAT-SUN. .KHGX...NONE. 43/45/41/36/48/DEB CLL BB 085/066 087/067 089 3-4 IAH EB 083/066 088/066 089 5-4 GLS EB 081/068 082/067 082 6-3
In the hours before
Local storm report, May 20, 3:01 AM CDT, 1 hour 58 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
301 AM CDT SAT MAY 20 2000
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0600 PM (IAH)HOUSTON INTL ARPT TX FLOOD
05/19/00 HARRIS ONE FOOT OF WATER IN
IAH APPROACH CONTROL
FACILITY REPORTED BY
CWSU.
1050 PM 5 E DANCIGER TX TSTM WIND
05/19/00 BRAZORIA SHERIFF'S OFFICE
REPORTED TREES UPROOTED
ALONG FM 1301 BETWEEN
DANCIGER AND WEST
COLUMBIA.
1105 PM DAYTON TX FLOOD
05/19/00 LIBERTY EXTENSIVE STREET
FLOODING REPORTED BY
SHERIFF'S OFFICE.
1150 PM LIBERTY TX FLOOD
05/19/00 LIBERTY MEDIA REPORTED 1 TO 2
FEET OF WATER ON 50
PERCENT OF AREA ROADS.
1210 AM 1 E WALLER TX FLOOD
05/20/00 WALLER SHERIFF'S OFFICE
REPORTED 10 INCHES OF
WATER AT HWY 290 BYPASS
AND FM 1098 AND ON
FM 362 AND KICKAPOO ROAD.
1230 AM LIBERTY TX FLOOD
05/20/00 LIBERTY MEDIA REPORTED NUMEROUS
VEHICLES FLOODED.
1230 AM DAYTON TX FLOOD
05/20/00 LIBERTY SHERIFF'S OFFICE
REPORTED WATER IN HOMES.
1230 AM DAYTON TX TSTM WIND
05/20/00 LIBERTY SHERIFF'S OFFICE
REPORTED POWER LINES
DOWN.
1230 AM LIBERTY TX MPH TSTM GUST
05/20/00 LIBERTY SHERIFF'S OFFICE
REPORTED POWER LINES
DOWN.
NThe office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:25 PM CDT | Severe Thunderstorm Warning | HGX | Harris | 35 min |
| May 19, 8:46 PM CDT | Tornado Warning | HGX | Liberty | 59 min |
| May 19, 8:49 PM CDT | Flash Flood Warning | HGX | Harris, Liberty | 116 min |
| May 19, 9:20 PM CDT | Flash Flood Warning | HGX | Waller | 3 hr |
| May 19, 10:35 PM CDT | Flash Flood Warning | HGX | Harris, Liberty, Montgomery | 100 min |
| May 19, 10:45 PM CDT | Tornado Warning | HGX | Brazoria | 45 min |
| May 19, 11:17 PM CDT | Severe Thunderstorm Warning | HGX | Liberty | 43 min |
| May 19, 11:25 PM CDT | Tornado Warning | HGX | Brazoria | 50 min |
| May 19, 11:30 PM CDT | Tornado Warning | HGX | Liberty | 30 min |
| May 19, 11:33 PM CDT | Flash Flood Warning | HGX | Brazoria | 3 hr |
| May 20, 12:00 AM CDT | Flash Flood Warning | HGX | Brazoria, Chambers, Fort Bend, Harris, Liberty, Waller and 1 more | 5 hr |
| May 20, 12:25 AM CDT | Tornado Warning | HGX | Chambers, Liberty | 65 min |
| May 20, 2:02 AM CDT | Severe Thunderstorm Warning | HGX | Galveston | 28 min |
| May 20, 2:22 AM CDT | Tornado Warning | HGX | Chambers, Galveston | 38 min |
Nearby
Flash Flood Warnings in Texas, 2000Every flash flood warning in 2000
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.