Flash Flood Warning 25, NWS Houston/Galveston, TX

Issued

Aug 22, 2002, 3:40 PM CDT (20:40 UTC)

Expired

Aug 22, 2002, 5:45 PM CDT

In force

2 hr

Issued by

NWS Houston/Galveston, TX

Area

Counties, with a storm outline in the text

County Harris County, TX

The Houston radar (KHGX), 60 km from the middle of the area, began a volume at 20:40 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.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WGUS54 KHGX 222040
FFWHOU
TXC201-222245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
338 PM CDT THU AUG 22 2002

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HARRIS COUNTY IN SOUTHEAST TEXAS

* UNTIL 545 PM CDT

* AT 330 PM CDT...DOPPLER RADAR INDICATED INTENSE RAINFALL OVER 
CENTRAL AND WESTERN HARRIS COUNTY. FLOODING OF ROADWAYS WILL LIKELY 
SNARL TRAFFIC THIS AFTERNOON. 2 TO 3 INCHES OF RAIN HAS ALREADY 
FALLEN IN LESS THAN 90 MINUTES. ANOTHER INCH OR TWO IS POSSIBLE BE 
FORE THE RAIN DIMINISHES.

* FLOODING IS EXPECTED IN OR NEAR...
  SPRING VALLEY...HOUSTON...HEDWIG VILLAGE

DO NOT CROSS ANY LOCATION 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.

LAT...LON 2988 9566 2978 9566 2976 9536 2986 9538

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Aug 22, 1:30 PM CDT, 2 hours 10 minutes earlier.

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
130 PM CDT THU AUG 22 2002

CONVECTION NOT AS WIDESPREAD AS EXPECTED...MAYBE DUE TO SOME WEAK
SUBSIDENCE ON THE WESTERN EDGE OF POORLY DEFINED 50H CIRCULATION.
THIS FEATURE WILL WEAKEN AND SHIFT WEST WITH TIME. MOISTURE ON THE
EASTERN FRINGE OF THIS SYSTEM SHOULD REMAIN OVER THE AREA ON FRI-SAT
SO IT SEEMS REASONABLE THAT SCATTERED TSRA WILL PERSIST INTO THE
FIRST HALF OF THE WEEKEND. HAVE LEANED TOWARD THE ETA MODEL AS IT
KEEPS DEEPER MOISTURE OVER SE TX THROUGH SATURDAY. AVN IS MUCH DRIER
AND FEEL DRYING TREND IS A BIT OVERDONE. STORM MOTION ON FRI WILL
AGAIN BE SLOW AND LOCALLY HEAVY RAIN STILL A POSSIBILITY. BOTH THE
AVN/ETA HINT AT 85H CONVERGENCE AT 18Z FRI...SO EXPECT COVERAGE TO
BE WIDESPREAD BY AFTERNOON.

IN THE LONG TERM...50H RIDGE OVER THE WESTERN U.S. WILL EXPAND
AMPLIFY WHILE A 50H TROF OVER THE MISSISSIPPI VALLEY DIGS SOUTH. THE
UPPER FLOW IS NORTHERLY AND ANY CONVECTIVE COMPLEX THAT DEVELOPS
NORTH OF THE REGION WILL SINK SOUTH. A WEAK FRONT IS ALSO FCST TO
PUSH INTO EXTREME NE TX. MSTR WILL FOCUS ON THIS BNDRY SUN-TUE.
CANADIAN AND ECMWF BRING THE 50H TROF MUCH FURTHER SOUTH THAN THE
OTHER SOLUTIONS. 50H ARE ACTUALLY LOWER MON-TUE THAN THEY ARE TODAY SO
THINK RAIN CHANCES WILL BE HIGHER THAN EXTENDED MODELS CURRENTLY
INDICATE. 43/47

.HGX...NONE.

PRELIMS...
CLL BB 075/095 075/096 075 332
IAH EB 076/094 076/095 075 343
GLS TB 081/090 081/090 082 252

Flash Flood Warnings in Texas, 2002Every flash flood warning in 2002

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.