February 2, 2023 12:48 pm

Posted: 28.8.2012 11:04

10am isaac update as it drifts west high island now in tropical storm watch area

…Isaac still just below hurricane strength as it continues northwestward…

summary of 1000 am CDT...1500 UTC...information
location...28.1n 88.5w
about 80 mi...125 km SSE of the mouth of the Mississippi River
about 165 mi...260 km se of New Orleans Louisiana
maximum sustained winds...70 mph...110 km/h
present movement...NW or 310 degrees at 10 mph...17 km/h
minimum central pressure...976 mb...28.82 inches
watches and warnings
changes with this advisory...
the Hurricane Warning has been replaced with a Tropical Storm
Warning from the Mississippi-Alabama border eastward to Destin
The Tropical Storm Warning has been discontinued east of Destin.
Summary of watches and warnings in effect...
a Hurricane Warning is in effect for...
* east of Morgan City Louisiana to the Mississippi-Alabama border...
including metropolitan New Orleans...Lake Pontchartrain...and Lake
a Hurricane Watch is in effect for...
* Intracoastal City to Morgan City Louisiana
a Tropical Storm Warning is in effect for...
* the Mississippi-Alabama border to Destin Florida
* Morgan City to Cameron Louisiana
a tropical storm watch is in effect for...
* east of High Island Texas to just west of Cameron 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.
A tropical storm watch means that tropical storm conditions are
possible within the watch area.
For storm information specific to your area including possible
inland watches and warnings...please monitor products issued by
your local National Weather Service forecast office. 
Discussion and 48-hour outlook
at 1000 am CDT...1500 UTC...the center of Tropical Storm Isaac was
located near latitude 28.1 north...longitude 88.5 west. Isaac is
moving toward the northwest near 10 mph...17 km/h.  A northwestward
motion at a slightly slower speed is expected over the next day or
two.  On the forecast track...the center of Isaac should reach the
coastline of southeastern Louisiana as early as this evening.
Maximum sustained winds are near 70 mph...110 km/h...with higher
gusts.  Isaac is expected to become a hurricane before making
landfall...and begin to slowly weaken after that.
Tropical storm force winds extend outward up to 185 miles...295 km
from the center.
The latest minimum central pressure reported by hurricane hunter
aircraft was 976 mb...28.82 inches.
Hazards affecting land
storm surge...the combination of a storm surge and the tide will
cause normally dry areas near the coast to be flooded by rising
waters. The water could reach the following depths above ground if
the peak surge occurs at the time of high tide...
* Mississippi and southeastern Louisiana...6 to 12 ft
* Alabama...4 to 8 ft
* south-central Louisiana...3 to 6 ft
* Florida Panhandle...3 to 6 ft
* Apalachee Bay...2 to 4 ft
* remainder of Florida West Coast...1 to 3 ft
the deepest water will occur along the immediate coast in areas of
onshore winds.  Surge-related flooding depends on the relative
timing of the surge and the tidal cycle...and can vary greatly over
short distances.  For information specific to your area...please
see products issued by your local Weather Service office.  Near the
coast...the surge will be accompanied by large and dangerous waves.
Wind...tropical storm conditions are beginning to occur near the
mouth of the Mississippi River...and will reach other portions of
the coastline within the tropical storm and Hurricane Warning areas
by late this afternoon.  Hurricane conditions are expected to reach
the coast by late afternoon.
Rainfall...Isaac is expected to produce total rainfall amounts of
7 to 14 inches...with possible isolated maximum amounts of 20
inches...in southeastern Louisiana...southern Mississippi...
southern Alabama...and the extreme western Florida Panhandle.
These rains could result in significant lowland flooding.
Tornadoes...tornadoes may occur along the northern Gulf Coast today.
Surf...dangerous surf and rip current conditions will continue to
affect the Florida coastline and portions of the northern Gulf Coast
for the next day or so.
Next advisory
next intermediate advisory...100 PM CDT.
Next complete advisory...400 PM CDT.
Forecaster Stewart