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HURRICANE HARVEY FORECAST/ADVISORY NUMBER  20
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092017
0900 UTC FRI AUG 25 2017
 
CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
 
NONE.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT... 
 
A STORM SURGE WARNING IS IN EFFECT FOR...
* PORT MANSFIELD TO HIGH ISLAND TEXAS
 
A STORM SURGE WATCH IS IN EFFECT FOR...
* SOUTH OF PORT MANSFIELD TEXAS TO THE MOUTH OF THE RIO GRANDE
 
A HURRICANE WARNING IS IN EFFECT FOR...
* PORT MANSFIELD TO SARGENT TEXAS
 
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* NORTH OF SARGENT TO HIGH ISLAND TEXAS
* SOUTH OF PORT MANSFIELD TEXAS TO THE MOUTH OF THE RIO GRANDE
 
A HURRICANE WATCH IS IN EFFECT FOR...
* SOUTH OF PORT MANSFIELD TEXAS TO THE MOUTH OF THE RIO GRANDE
 
A TROPICAL STORM WATCH IS IN EFFECT FOR...
* SOUTH OF THE MOUTH OF THE RIO GRANDE TO BOCA DE CATAN MEXICO
 
A STORM SURGE WARNING MEANS THERE IS A DANGER OF LIFE-THREATENING
INUNDATION... FROM RISING WATER MOVING INLAND FROM THE COASTLINE... 
DURING THE NEXT 36 HOURS IN THE INDICATED LOCATIONS. FOR A DEPICTION
OF AREAS AT RISK... PLEASE SEE THE NATIONAL WEATHER SERVICE STORM
SURGE WATCH/WARNING GRAPHIC... AVAILABLE AT HURRICANES.GOV.  THIS 
IS A
LIFE-THREATENING SITUATION.  PERSONS LOCATED WITHIN THESE AREAS
SHOULD TAKE ALL NECESSARY ACTIONS TO PROTECT LIFE AND PROPERTY FROM
RISING WATER AND THE POTENTIAL FOR OTHER DANGEROUS CONDITIONS.
PROMPTLY FOLLOW EVACUATION AND OTHER INSTRUCTIONS FROM LOCAL
OFFICIALS.
 
A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA... IN THIS CASE WITHIN THE NEXT 12
TO 24 HOURS. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE
RUSHED TO COMPLETION.
 
A STORM SURGE WATCH MEANS THERE IS A POSSIBILITY OF LIFE-
THREATENING INUNDATION... FROM RISING WATER MOVING INLAND FROM THE
COASTLINE... IN THE INDICATED LOCATIONS DURING THE NEXT 48 HOURS.
 
A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE
WITHIN THE WATCH AREA.
 
IN ADDITION... INTERESTS IN SOUTHWESTERN LOUISIANA SHOULD CONTINUE 
TO
MONITOR THE PROGRESS OF THIS SYSTEM.
 
HURRICANE CENTER LOCATED NEAR 25.9N  95.4W AT 25/0900Z
POSITION ACCURATE WITHIN  15 NM
 
PRESENT MOVEMENT TOWARD THE NORTHWEST OR 320 DEGREES AT   8 KT
 
ESTIMATED MINIMUM CENTRAL PRESSURE  967 MB
EYE DIAMETER  10 NM
MAX SUSTAINED WINDS  90 KT WITH GUSTS TO 110 KT.
64 KT....... 20NE  20SE  10SW  20NW.
50 KT....... 30NE  30SE  20SW  30NW.
34 KT.......120NE  50SE  40SW  90NW.
12 FT SEAS..120NE  90SE  75SW 120NW.
WINDS AND SEAS VARY GREATLY IN EACH QUADRANT.  RADII IN NAUTICAL
MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.
 
REPEAT...CENTER LOCATED NEAR 25.9N  95.4W AT 25/0900Z
AT 25/0600Z CENTER WAS LOCATED NEAR 25.6N  95.1W
 
FORECAST VALID 25/1800Z 26.9N  96.3W
MAX WIND 105 KT...GUSTS 130 KT.
64 KT... 20NE  20SE  10SW  20NW.
50 KT... 30NE  30SE  20SW  30NW.
34 KT...120NE  50SE  40SW  90NW.
 
FORECAST VALID 26/0600Z 28.0N  97.1W
MAX WIND 105 KT...GUSTS 130 KT.
64 KT... 30NE  30SE  20SW  30NW.
50 KT... 60NE  50SE  40SW  50NW.
34 KT...130NE 100SE  70SW 100NW.
 
FORECAST VALID 26/1800Z 28.5N  97.4W...INLAND
MAX WIND  65 KT...GUSTS  80 KT.
64 KT... 20NE  20SE   0SW   0NW.
50 KT... 60NE  60SE  50SW  40NW.
34 KT...120NE 120SE  80SW  70NW.
 
FORECAST VALID 27/0600Z 28.5N  97.5W...INLAND
MAX WIND  60 KT...GUSTS  75 KT.
50 KT... 40NE  40SE  30SW  20NW.
34 KT...120NE 100SE  70SW  50NW.
 
FORECAST VALID 28/0600Z 28.3N  97.0W...INLAND
MAX WIND  35 KT...GUSTS  45 KT.
34 KT...100NE 100SE  30SW   0NW.
 
EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM
ON DAY 4 AND 200 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY
 
OUTLOOK VALID 29/0600Z 28.5N  96.0W...OVER WATER
MAX WIND  35 KT...GUSTS  45 KT.
 
OUTLOOK VALID 30/0600Z 29.5N  95.0W...INLAND
MAX WIND  35 KT...GUSTS  45 KT.
 
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 25.9N  95.4W
 
NEXT ADVISORY AT 25/1500Z
 
$$
FORECASTER AVILA
 
 
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