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HURRICANE IDA FORECAST/ADVISORY NUMBER  12
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092021
0900 UTC SUN AUG 29 2021
 
CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
 
NONE.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
 
A STORM SURGE WARNING IS IN EFFECT FOR...
* EAST OF ROCKEFELLER WILDLIFE REFUGE LOUISIANA TO THE
ALABAMA/FLORIDA BORDER
* VERMILION BAY...LAKE BORGNE...LAKE PONTCHARTRAIN...LAKE
MAUREPAS...AND MOBILE BAY
 
A HURRICANE WARNING IS IN EFFECT FOR...
* INTRACOASTAL CITY LOUISIANA TO THE MOUTH OF THE PEARL RIVER
* LAKE PONTCHARTRAIN...LAKE MAUREPAS...AND METROPOLITAN NEW ORLEANS
 
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* CAMERON LOUISIANA TO WEST OF INTRACOASTAL CITY LOUISIANA
* MOUTH OF THE PEARL RIVER TO THE ALABAMA/FLORIDA BORDER
 
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 WITHIN THE NEXT 6 TO 12 HOURS.
PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO
COMPLETION.
 
A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
EXPECTED SOMEWHERE WITHIN THE WARNING AREA...IN THIS CASE WITHIN THE
NEXT 12 TO 24 HOURS.
 
HURRICANE CENTER LOCATED NEAR 28.0N  89.1W AT 29/0900Z
POSITION ACCURATE WITHIN  15 NM
 
PRESENT MOVEMENT TOWARD THE NORTHWEST OR 315 DEGREES AT  13 KT
 
ESTIMATED MINIMUM CENTRAL PRESSURE  946 MB
EYE DIAMETER  15 NM
MAX SUSTAINED WINDS 120 KT WITH GUSTS TO 145 KT.
64 KT....... 35NE  30SE  20SW  30NW.
50 KT....... 70NE  60SE  40SW  60NW.
34 KT.......120NE 100SE  80SW 110NW.
12 FT SEAS..180NE 150SE 150SW 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 28.0N  89.1W AT 29/0900Z
AT 29/0600Z CENTER WAS LOCATED NEAR 27.6N  88.7W
 
FORECAST VALID 29/1800Z 29.1N  90.3W...NEAR SERN LOUISIANA COAST
MAX WIND 125 KT...GUSTS 150 KT.
64 KT... 35NE  30SE  20SW  30NW.
50 KT... 70NE  60SE  40SW  60NW.
34 KT...130NE 110SE  90SW 100NW.
 
FORECAST VALID 30/0600Z 30.6N  91.1W...INLAND
MAX WIND  70 KT...GUSTS  85 KT.
64 KT... 25NE  25SE  15SW  15NW.
50 KT... 50NE  50SE  30SW  30NW.
34 KT...100NE 120SE  80SW  70NW.
 
FORECAST VALID 30/1800Z 32.2N  91.0W...INLAND
MAX WIND  45 KT...GUSTS  55 KT.
34 KT... 50NE 120SE  40SW  40NW.
 
FORECAST VALID 31/0600Z 33.8N  90.0W...INLAND
MAX WIND  30 KT...GUSTS  40 KT.
 
FORECAST VALID 31/1800Z 35.4N  87.9W...INLAND
MAX WIND  25 KT...GUSTS  35 KT.
 
FORECAST VALID 01/0600Z 36.7N  85.2W...INLAND
MAX WIND  20 KT...GUSTS  30 KT.
 
EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM
ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY
 
OUTLOOK VALID 02/0600Z 38.9N  78.9W...POST-TROP/INLAND
MAX WIND  20 KT...GUSTS  30 KT.
 
OUTLOOK VALID 03/0600Z...DISSIPATED
 
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 28.0N  89.1W
 
INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 29/1200Z
 
NEXT ADVISORY AT 29/1500Z
 
$$
FORECASTER STEWART
 
 
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