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HURRICANE IDA FORECAST/ADVISORY NUMBER   9
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092021
1500 UTC SAT AUG 28 2021
 
CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
 
THE TROPICAL STORM WARNING HAS BEEN EXTENDED EASTWARD ALONG THE
NORTHERN GULF COAST TO THE ALABAMA/FLORIDA BORDER.
 
THE HURRICANE WATCH ALONG THE COAST OF MISSISSIPPI FROM THE MOUTH
OF THE PEARL RIVER TO THE MISSISSIPPI/ALABAMA BORDER HAS BEEN
DISCONTINUED.  THE HURRICANE WATCH ALONG THE COAST OF LOUISIANA
WEST OF INTRACOASTAL CITY HAS ALSO BEEN DISCONTINUED.
 
THE STORM SURGE WATCH FROM SABINE PASS TO ROCKEFELLER WILDLIFE
REFUGE LOUISIANA HAS BEEN DISCONTINUED.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
 
A STORM SURGE WARNING IS IN EFFECT FOR...
* EAST OF ROCKEFELLER WILDLIFE REFUGE LOUISIANA TO THE
MISSISSIPPI/ALABAMA BORDER
* VERMILION BAY...LAKE BORGNE...LAKE PONTCHARTRAIN...AND LAKE
MAUREPAS
 
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 STORM SURGE WATCH IS IN EFFECT FOR...
* MOBILE BAY
 
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.  A WARNING IS TYPICALLY ISSUED
36 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL- 
STORM-FORCE WINDS...CONDITIONS THAT MAKE OUTSIDE PREPARATIONS 
DIFFICULT OR DANGEROUS.  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 WITHIN 36 HOURS.
 
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.
 
HURRICANE CENTER LOCATED NEAR 24.8N  86.1W AT 28/1500Z
POSITION ACCURATE WITHIN  15 NM
 
PRESENT MOVEMENT TOWARD THE NORTHWEST OR 315 DEGREES AT  14 KT
 
ESTIMATED MINIMUM CENTRAL PRESSURE  984 MB
MAX SUSTAINED WINDS  75 KT WITH GUSTS TO  90 KT.
64 KT....... 25NE  20SE   0SW   0NW.
50 KT....... 50NE  40SE  20SW  30NW.
34 KT.......110NE 100SE  60SW 100NW.
12 FT SEAS..120NE 120SE  90SW  90NW.
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 24.8N  86.1W AT 28/1500Z
AT 28/1200Z CENTER WAS LOCATED NEAR 24.4N  85.7W
 
FORECAST VALID 29/0000Z 26.3N  87.9W
MAX WIND 100 KT...GUSTS 120 KT.
64 KT... 20NE  20SE  15SW  20NW.
50 KT... 50NE  40SE  30SW  40NW.
34 KT...120NE 100SE  70SW 100NW.
 
FORECAST VALID 29/1200Z 28.0N  89.8W
MAX WIND 115 KT...GUSTS 140 KT.
64 KT... 30NE  25SE  15SW  25NW.
50 KT... 60NE  50SE  30SW  40NW.
34 KT...130NE 110SE  80SW 100NW.
 
FORECAST VALID 30/0000Z 29.4N  91.0W...NEAR COAST OF LOUISIANA
MAX WIND 115 KT...GUSTS 140 KT.
64 KT... 30NE  30SE  20SW  30NW.
50 KT... 50NE  50SE  30SW  40NW.
34 KT...110NE 110SE  80SW 100NW.
 
FORECAST VALID 30/1200Z 31.0N  91.5W...INLAND
MAX WIND  60 KT...GUSTS  75 KT.
50 KT... 20NE  30SE   0SW  20NW.
34 KT... 60NE  90SE  40SW  40NW.
 
FORECAST VALID 31/0000Z 32.7N  91.0W...INLAND
MAX WIND  30 KT...GUSTS  40 KT.
 
FORECAST VALID 31/1200Z 34.4N  89.8W...INLAND
MAX WIND  25 KT...GUSTS  35 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 01/1200Z 36.8N  85.3W...POST-TROP/INLAND
MAX WIND  20 KT...GUSTS  30 KT.
 
OUTLOOK VALID 02/1200Z 37.9N  79.9W...POST-TROP/INLAND
MAX WIND  20 KT...GUSTS  30 KT.
 
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 24.8N  86.1W
 
INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 28/1800Z
 
NEXT ADVISORY AT 28/2100Z
 
$$
FORECASTER BROWN
 
 
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