Flash Flood Warning 86, NWS Houston/Galveston, TX

Issued

Oct 18, 1998, 4:38 AM CDT (09:38 UTC)

Expired

Oct 18, 1998, 8:00 AM CDT

In force

3 hr

Issued by

NWS Houston/Galveston, TX

Area

Whole counties

Counties Harris County, TX, Montgomery County, TX

The Houston radar (KHGX), 76 km from the middle of the area, began a volume at 09:42 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.

000 
TTAA00 KHOU 180938
FFWHOU
TXC201-339-181300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
438 AM CDT SUN OCT 18 1998

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN HARRIS COUNTY IN SOUTHEASTERN TEXAS
  MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS

* UNTIL 800 AM CDT

* AT 430 AM... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  BAND OF THUNDERSTORMS...PRODUCING VERY HEAVY RAIN FROM CONROE TO
  TOMBALL TO KATY. THUNDERSTORMS ARE  CONTINUING TO REDEVELOP ALONG
  THIS LINE WHICH IS NEARLY STATIONARY.

* RADAR AND GAUGE REPORTS INDICATE THAT PORTIONS OF NORTHWEST
  HARRIS COUNTY HAVE RECEIVED 4 TO 6 INCHES OF RAIN DURING THE LAST 3
  HOURS. ACROSS MONTGOMERY COUNTY...RADAR ESTIMATES ARE NEAR
  3 TO 4 INCHES ACROSS EASTERN PORTIONS OF THE COUNTY AND 4
  TO 6 INCHES IN THE EXTREME SOUTHWEST PART OF THE COUNTY.
  AN ADDITIONAL 3 TO 5 INCHES ARE POtSSIBLE DURING THE NEXT 3
  HOURS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODING.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Oct 18, 2:50 AM CDT, 1 hour 48 minutes earlier.

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
250 AM CDT SUN OCT 18 1998

LOOKS LIKE THE SOGGY FORECAST IS HERE TO STAY.  THE HEAVY/PERSISTENT
RAINS OVER SWRN PORTIONS OF THE FA HAVE PRODUCED NUMEROUS REPORTS OF
FLOODING LAST EVENING (AND INTO THIS MORNING).  ADDITIONALLY...THERE
WERE ALSO SOME REPORTS OF FUNNEL CLOUDS/TORNADOES EARLIER TODAY (AND
EVEN TONIGHT).  MEANWHILE...THE LARGE AREA OF MAINLY SHRA CONTINUING
TO SLOWLY MOVE (MORE ELY THAN SE) ACROSS THE AREA.  HOWEVER...ALL OF
THIS SHOULD SHIFT A LITTLE MORE SE TODAY AS THE COLD FRONT CURRENTLY
OVER N TX EDGES A BIT FURTHER SSE.  WITH GOOD UPPER DIVERGENCE PROG-
GED ALONG WITH A DECENT SURGE OF PW (AOA 2") COMBINED WITH PROXIMITY
OF THE FRONT AND AVAILABLE DEEP TROPICAL MOISTURE...HEAVY RAINS WILL
LIKELY CONTINUE THIS FCST PD.  WOULD ALSO LIKE TO ADD THE MENTION OF
"SOME POSSIBLY SEVERE" IN SOME OF THE ZONES BASED MAINLY ON WHAT HAS
ALREADY TRANSPIRED ALONG WITH THE POSSIBILITY OF SOME HEATING OVER S
PARTS OF THE CWA/PROGGED VERTICAL SHEAR/INFLOW.  LOOKING AHEAD...THE
FRONT WILL LIKELY PULL UP STATIONARY OVER AT LEAST THE N HALF OF THE
AREA AS UPPER SUPPORT FADES, AND UPPER LOW REMAINS ANCHORED OVER THE
CA BAJA.  TIMING OF S/Ws FROM THE LOW WILL BE THE TRICKY PART OF THE
FCST, BUT WILL GO AHEAD AND OPT FOR HIGH POPS/ABUNDANT CLOUDS ACROSS
THE BOARD, GIVEN ALL THE OTHER INGREDIENTS IN PLACE.  WILL ALSO KEEP
FFA UP FOR NOW.  WILL GO SLIGHTLY ABOVE MOS TEMPS AS CLOUDS STAY IN.
41

PRELIMS...
CLL  C/C C/C  78/64 76/61 +776  HVY RAINS
IAH  C/C C/C  81/67 78/64 +776  HVY RAINS/POSSIBLY SVR
GLS  E/C C/C  84/76 80/72 8776  HVY RAINS/POSSIBLY SVR

Flash Flood Warnings in Texas, 1998Every flash flood warning in 1998

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.