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Discussion and 48-hour outlook

at 400 PM CDT...2100 UTC...the center of Hurricane Isaac was located
by NOAA Doppler radars near latitude 28.7 north...longitude 89.2
west. Isaac is moving toward the northwest near 8 mph...13 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
Hurricane Isaac should reach the coastline of southeastern
Louisiana this evening.

Maximum sustained winds have increased to near 80 mph...130 km/h...
with higher gusts. Isaac is a category one hurricane on the Saffir-
Simpson hurricane wind scale. Some slight strengthening is possible
before Isaac makes landfall. Gradual weakening is expected after
landfall occurs.

Hurricane-force winds extend outward up to 60 miles...95 km...mainly
to the northeast and east of the center. Tropical-storm-force
winds extend outward up to 185 miles...295 km. Tropical storm
conditions are occurring along the coastal areas of southeastern
Louisiana...Mississippi...and Alabama. NOAA buoy 42040...located
east of the mouth of the Mississippi River...recently measured
sustained winds of 63 mph...100 km/h...and a gust to 83 mph...
135 km/h.

The estimated minimum central pressure is 975 mb...28.79 inches.

http://classic.wunderground.com/tropical/at201209.public.html#a_topad