Hurricane Isaac

Forecast Advisory 27

---

284
WTNT24 KNHC 272045
TCMAT4

TROPICAL STORM ISAAC FORECAST/ADVISORY NUMBER 27
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012
2100 UTC MON AUG 27 2012

CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...

THE HURRICANE WARNING FROM THE FLORIDA-ALABAMA BORDER TO DESTIN HAS
BEEN CHANGED TO A TROPICAL STORM WARNING.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT...

A HURRICANE WARNING IS IN EFFECT FOR...
* EAST OF MORGAN CITY LOUISIANA TO THE ALABAMA-FLORIDA BORDER...
INCLUDING METROPOLITAN NEW ORLEANS...LAKE PONTCHARTRAIN... AND LAKE
MAUREPAS

A HURRICANE WATCH IS IN EFFECT FOR...
* INTRACOASTAL CITY TO MORGAN CITY LOUISIANA

A TROPICAL STORM WARNING IS IN EFFECT FOR...
* FROM THE ALABAMA-FLORIDA BORDER TO THE AUCILLA RIVER
* INTRACOASTAL CITY TO MORGAN CITY LOUISIANA

A TROPICAL STORM WATCH IS IN EFFECT FOR...
* EAST OF SABINE PASS TO WEST OF INTRACOASTAL CITY LOUISIANA

A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA. PREPARATIONS TO PROTECT LIFE AND
PROPERTY SHOULD BE RUSHED TO COMPLETION.

A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE
WITHIN THE WATCH AREA.

A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS.

A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS.

TROPICAL STORM CENTER LOCATED NEAR 26.4N 86.2W AT 27/2100Z
POSITION ACCURATE WITHIN 15 NM

PRESENT MOVEMENT TOWARD THE NORTHWEST OR 305 DEGREES AT 10 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 981 MB
MAX SUSTAINED WINDS 60 KT WITH GUSTS TO 75 KT.
50 KT....... 50NE 15SE 15SW 50NW.
34 KT.......150NE 150SE 80SW 180NW.
12 FT SEAS..180NE 180SE 180SW 150NW.
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 26.4N 86.2W AT 27/2100Z
AT 27/1800Z CENTER WAS LOCATED NEAR 26.1N 85.9W

FORECAST VALID 28/0600Z 27.4N 87.5W
MAX WIND 70 KT...GUSTS 85 KT.
64 KT... 20NE 0SE 0SW 20NW.
50 KT... 60NE 20SE 20SW 60NW.
34 KT...165NE 150SE 80SW 180NW.

FORECAST VALID 28/1800Z 28.6N 89.0W
MAX WIND 80 KT...GUSTS 100 KT.
64 KT... 20NE 20SE 0SW 20NW.
50 KT... 60NE 50SE 30SW 60NW.
34 KT...180NE 150SE 80SW 180NW.

FORECAST VALID 29/0600Z 29.5N 90.0W...NEAR THE COAST
MAX WIND 85 KT...GUSTS 105 KT.
64 KT... 30NE 20SE 10SW 20NW.
50 KT... 60NE 60SE 40SW 60NW.
34 KT...180NE 150SE 80SW 150NW.

FORECAST VALID 29/1800Z 30.3N 90.7W...INLAND
MAX WIND 75 KT...GUSTS 90 KT.
50 KT... 60NE 60SE 40SW 40NW.
34 KT...180NE 150SE 80SW 110NW.

FORECAST VALID 30/1800Z 32.2N 91.8W...INLAND
MAX WIND 35 KT...GUSTS 45 KT.
34 KT... 60NE 130SE 30SW 40NW.

EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 175 NM
ON DAY 4 AND 225 NM ON DAY 5...AND FOR INTENSITY NEAR 20 KT EACH DAY

OUTLOOK VALID 31/1800Z 35.9N 92.1W...INLAND
MAX WIND 25 KT...GUSTS 35 KT.

OUTLOOK VALID 01/1800Z 38.7N 89.3W...INLAND
MAX WIND 20 KT...GUSTS 30 KT.

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 26.4N 86.2W

NEXT ADVISORY AT 28/0300Z

$$
FORECASTER STEWART