Flash Flood Warning 26, NWS Houston/Galveston, TX

571 
WGUS74 KHGX 161100
FFSHGX
FLASH FLOOD STATEMENTNATIONAL WEATHER SERVICE HOUSTON/GALVESTON 
TX600 AM CDT MON APR 16 2012

TXC039-161200-
/O.CON.KHGX.FF.W.0026.000000T0000Z-120416T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BRAZORIA TX-
600 AM CDT MON APR 16 2012

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 AM CDT FOR 
BRAZORIA COUNTY...

AT 556 AM CDT...DOPPLER RADAR INDICATED THE HEAVIEST RAINFALL HAS 
MOVED OFF TO THE EAST AND SOUTH OF THE WARNED AREA. LAW ENFORCEMENT 
HAS REPORTED NO ROAD CLOSURES IN THE COUNTY...AND ONLY LIGHT TO 
MODERATE RAIN IS FALLING AT THIS TIME. ADDITIONAL DEVELOPMENT CANNOT 
BE RULED OUT...SO THE WARNING WILL REMAIN IN EFFECT UNTIL 700 AM 
CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND AS WELL 
AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO 
CROSS SAFELY.  MOVE TO HIGHER GROUND.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY 
YOUR REPORT TO THE NATIONAL WEATHER SERVICE. 

&&

LAT...LON 2898 9569 2919 9546 2929 9529 2935 9516
      2931 9513 2921 9519 2921 9520 2920 9519
      2908 9526 2894 9552 2892 9560

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
421 AM CDT MON APR 16 2012

.DISCUSSION...
EXCELLENT DIFFLUENT FLOW ALOFT AND A NORTHEAST-SOUTHWEST ORIENTED STATIONARY
FRONT RUNNING GENERALLY ALONG THE HIGHWAY 59 CORRIDOR IS HELPING TO
GENERATE SCATTERED SHOWERS AND THUNDERSTORMS ACROSS MAINLY THE CENTRAL
AND SOUTHERN PORTIONS OF SOUTHEAST TEXAS EARLY THIS MORNING. WITH THE
PRESENCE OF HIGH PRECIPITABLE WATER VALUES...LOCALLY HEAVY RAINFALL
IS BEING GENERATED WITH UNVERIFIED RADAR ESTIMATES AS HIGH AS 5 TO 7
INCHES IN RURAL LOCATIONS OF CENTRAL BRAZORIA COUNTY ASSOCIATED WITH
THE STRONGER AND MOST PERSISTENT ACTIVITY. SO FAR...URBAN AND SMALL
STREAM FLOOD ADVISORIES ARE BEING ISSUED TO COVER THIS ACTIVITY. TODAY'S
FORECAST WILL CARRY HIGHEST POPS ALONG WITH POSSIBLE LOCALLY HEAVY RAINFALL
CENTRAL AND SOUTH...AND ADJUSTMENTS WILL PROBABLY BE NEEDED AS THE DAY
PROGRESSES. MODELS ARE IN PRETTY DECENT AGREEMENT IN MOVING THE BEST
LIFT AND MOISTURE OFF TO OUR EAST LATER TONIGHT AND TOMORROW. WILL CONTINUE
TO INDICATE DECREASING POPS FROM WEST TO EAST DURING THIS TIME PERIOD.
ALL RAINS SHOULD COME TO AN END BY LATE TUESDAY AFTERNOON OR TUESDAY
EVENING. OUR AREA IS THEN IN STORE FOR A COUPLE DAYS OF NEAR NORMAL
TEMPERATURES UNDER A DRIER AIRMASS. AT THE END OF THE WEEK...A COLD
FRONT AND AN ASSOCIATED CHANCE OF SHOWERS AND THUNDERSTORMS WILL MOVE
THROUGH SOUTHEAST TEXAS. THE AREA WILL DRY OUT BEHIND THE FRONT...AND
THE WEEKEND LOOKS DRY AND QUIET WITH LOW HUMIDITIES AND NEAR NORMAL
TEMPERATURES AS HIGH PRESSURE AT BOTH THE SURFACE AND ALOFT BECOMES
THE DOMINATE FEATURE ACROSS THE STATE.  42

&&

.MARINE...
LONGER PERIOD FAR OFFSHORE SWELL PROPAGATING INTO OUR LOCAL WATERS
WILL KEEP 20-60 NM SEAS ELEVATED TO SCEC LEVELS THROUGH TOMORROW.
WINDS HAVE SIGNIFICANTLY TAPERED OFF TO UNDER 15 KNOTS BUT...WITH A
MORE EASTERLY FETCH PER BEING ON THE SOUTH SIDE OF A NEAR-COASTAL
STATIONARY BOUNDARY...THIS MAY ALLOW FOR THE DEVELOPMENT OF SLIGHTLY
HIGHER THAN NORMAL WATER LEVELS ALONG EASTERN-FACING SHORELINES. 31

&&

.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      78  59  81  58  82 /  30  30  10  10  10
HOUSTON (IAH)              77  63  80  60  82 /  60  50  20  10  10
GALVESTON (GLS)            77  70  78  66  79 /  70  60  30  10  10

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...SMALL CRAFT SHOULD EXERCISE CAUTION UNTIL 5 AM CDT EARLY THIS
     MORNING FOR THE FOLLOWING ZONES: GALVESTON BAY...WATERS
     FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM...
     WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM.

     SMALL CRAFT ADVISORY UNTIL 5 AM CDT EARLY THIS MORNING FOR THE
     FOLLOWING ZONES: WATERS FROM FREEPORT TO THE MATAGORDA SHIP
     CHANNEL 20 NM TO 60 NM...WATERS FROM HIGH ISLAND TO
     FREEPORT 20 TO 60 NM.

     SMALL CRAFT SHOULD EXERCISE CAUTION THROUGH TUESDAY MORNING FOR
     THE FOLLOWING ZONES: WATERS FROM FREEPORT TO THE MATAGORDA
     SHIP CHANNEL 20 NM TO 60 NM...WATERS FROM HIGH ISLAND TO
     FREEPORT 20 TO 60 NM.

&&

DISCUSSION...42
AVIATION/MARINE...31

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
439 AM CDT MON APR 16 2012

GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-
227-235>238-171200-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-
MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO-
TRINITY-WALKER-WALLER-WASHINGTON-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON-
439 AM CDT MON APR 16 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

LOCALLY HEAVY RAINFALL IS POSSIBLE IN TRAINING SHOWERS AND THUNDERSTORMS
AS A STATIONARY FRONT LINGERS ACROSS THE AREA. RAINFALL TOTALS WITH
THE STRONGEST ACTIVITY IS EXPECTED TO AVERAGE 1 TO 2 INCHES WITH
ISOLATED AMOUNTS OF 4 INCHES OR MORE POSSIBLE. LOCALIZED FLOODING
IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

RAIN CHANCES WILL GRADUALLY DECREASE ACROSS THE AREA ON TUESDAY AS
THE STORM SYSTEM EDGES OFF TO THE EAST. HAZARDOUS WEATHER IS NOT
EXPECTED FOR WEDNESDAY THROUGH SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TODAY.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1130 PM CDT SUN APR 15 2012

TXZ164-160515-
TRINITY TX-
1130 PM CDT SUN APR 15 2012

...SPECIAL WEATHER STATEMENT...
...STRONG THUNDERSTORM OVER TRINITY COUNTY...

AT 1125 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
TRACKING A STRONG THUNDERSTORM NEAR GROVETON...OR 20 MILES
SOUTHWEST OF DIBOLL...MOVING NORTHEAST AT 35 MPH.

HAIL UP TO THE SIZE OF PEAS WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GROVETON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A
SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3134 9495 3133 9490 3130 9490 3128 9488
      3126 9490 3123 9486 3115 9485 3092 9510
      3102 9523 3137 9496
TIME...MOT...LOC 0425Z 218DEG 29KT 3102 9508

39