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#899536 (Received by flhurricane at: 10:57 AM 25.Aug.2017)
TCMAT4

HURRICANE HARVEY FORECAST/ADVISORY NUMBER 21
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092017
1500 UTC FRI AUG 25 2017

CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...

THE HURRICANE WATCH SOUTH OF PORT MANSFIELD TEXAS TO THE MOUTH OF
THE RIO GRANDE HAS BEEN DISCONTINUED.

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 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 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.

INTERESTS IN SOUTHWESTERN LOUISIANA SHOULD CONTINUE TO MONITOR THE
PROGRESS OF THIS SYSTEM.

HURRICANE CENTER LOCATED NEAR 26.7N 96.0W AT 25/1500Z
POSITION ACCURATE WITHIN 10 NM

PRESENT MOVEMENT TOWARD THE NORTHWEST OR 315 DEGREES AT 9 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 947 MB
EYE DIAMETER 15 NM
MAX SUSTAINED WINDS 95 KT WITH GUSTS TO 115 KT.
64 KT....... 30NE 20SE 10SW 20NW.
50 KT....... 50NE 40SE 40SW 30NW.
34 KT.......120NE 90SE 80SW 100NW.
12 FT SEAS..150NE 120SE 90SW 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 26.7N 96.0W AT 25/1500Z
AT 25/1200Z CENTER WAS LOCATED NEAR 26.4N 95.9W

FORECAST VALID 26/0000Z 27.6N 96.8W
MAX WIND 105 KT...GUSTS 130 KT.
64 KT... 30NE 25SE 15SW 20NW.
50 KT... 60NE 50SE 40SW 40NW.
34 KT...120NE 100SE 90SW 100NW.

FORECAST VALID 26/1200Z 28.4N 97.3W...INLAND
MAX WIND 90 KT...GUSTS 110 KT.
64 KT... 30NE 30SE 20SW 20NW.
50 KT... 60NE 50SE 40SW 40NW.
34 KT...120NE 120SE 100SW 100NW.

FORECAST VALID 27/0000Z 28.8N 97.5W...INLAND
MAX WIND 70 KT...GUSTS 85 KT.
64 KT... 20NE 20SE 0SW 0NW.
50 KT... 50NE 50SE 40SW 30NW.
34 KT...100NE 120SE 90SW 80NW.

FORECAST VALID 27/1200Z 28.9N 97.6W...INLAND
MAX WIND 55 KT...GUSTS 65 KT.
50 KT... 40NE 40SE 30SW 20NW.
34 KT...100NE 110SE 80SW 50NW.

FORECAST VALID 28/1200Z 28.3N 96.8W...INLAND
MAX WIND 35 KT...GUSTS 45 KT.
34 KT...120NE 70SE 50SW 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 29/1200Z 28.5N 95.5W...OVER WATER
MAX WIND 40 KT...GUSTS 50 KT.

OUTLOOK VALID 30/1200Z 30.0N 94.5W...INLAND
MAX WIND 40 KT...GUSTS 50 KT.

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 26.7N 96.0W

NEXT ADVISORY AT 25/2100Z

$$
FORECASTER BERG