11pm Ivan

[Brent]

Tropical Storm Ivan Advisory Number 6

Statement as of 11:00 PM AST on September 03, 2004

at 11 PM AST...0300z...the center of Tropical Storm Ivan was located
near latitude 9.1 north...longitude 35.8 west. This position is
over the east-central tropical Atlantic and is about 1775 miles...
2855 km...east of the Lesser Antilles.

Ivan is moving toward the west near 17 mph...28 km/hr...and this
motion is expected to continue for the next 24 hours.

Maximum sustained winds are near 50 mph... 85 km/hr...with higher
gusts. Some strengthening is forecast during the next 24 hours.

Tropical storm force winds extend outward up to 145 miles
...230 km from the center.

The estimated minimum central pressure is 999 mb...29.50 inches.

Repeating the 11 PM AST position... 9.1 N... 35.8 W. Movement
toward...west near 17 mph. Maximum sustained
winds... 50 mph. Minimum central pressure... 999 mb.

The next advisory will be issued by the National
Hurricane Center at 5 am AST.

Forecaster Lawrence

Tropical Storm Ivan Discussion Number 6

Statement as of 11:00 PM EDT on September 03, 2004

satellite Dvorak intensity estimates remain at 45 kt from TAFB and
SAB. A recent Quikscat pass had rain-flagged 55 kt surface winds
well south of the center and so did a pass from early Friday
morning. Since the Dvorak estimates have been the same all day
from SAB...the official intensity will stay the same as the
previous advisory...45 kt.

The SHIPS model brings the wind speed to 96 kt in 120 hours under
decreasing vertical wind shear and of course warm SSTs over the
tropical Atlantic. The GFDL is much more aggressive but...as is
usually the case...the official forecast follows the SHIPS model
and is similar to the previous advisory.

The initial position is a little north of the GOES 12 infrared fixes
based on an analysis of the 2228z Quikscat ambiguity wind field.
This gives an initial motion estimate of 265/15. The global models
all show the subtropical ridge holding to the north of Ivan and all
show a west-northwest track except becoming a little more
northwestward after 96 hours. The GFS is the left-most track and
the NOGAPS and GFDL embedded in the NOGAPS are the right-most
tracks. The official track forecast is adjusted to the right of
the previous forecast but is still left of a consensus of the
global models. In any case Ivan should move somewhere across the
Lesser Antilles in 4 to 5 days.

Forecaster Lawrence

forecast positions and Max winds

initial 04/0300z 9.1n 35.8w 45 kt
12hr VT 04/1200z 9.2n 38.0w 55 kt
24hr VT 05/0000z 9.4n 41.0w 60 kt
36hr VT 05/1200z 10.2n 44.0w 65 kt
48hr VT 06/0000z 11.0n 47.0w 75 kt
72hr VT 07/0000z 12.5n 53.5w 85 kt
96hr VT 08/0000z 14.5n 59.5w 90 kt(105 mph, just east of Martinque and north of Barbados)
120hr VT 09/0000z 16.5n 64.0w 95 kt(110 mph, south of St. Croix in the U.S. Virgin Islands)

[Renata]

Hola! Habla usted Portugese?

Hey, Ivan is going to Brazil. He's heard about the infamous all-year round Brazilian scintillating carnivals and he's going to check it out.

Remember Catarina earlier this year?