System 91S has shown increasing organization of its low-level circulation center over the last 12 hours, and favorable conditions for development. The vertical wind shear (winds that can tear a storm apart if strong enough) has decreased, so the potential for 91S to develop into a tropical cyclone is good in the next 24 hours.At 08:30 UTC (4:30 a.m. EDT) the circulation center of 91S appeared to be near 10.1 degrees South latitude and 116.4 East longitude, and had maximum sustained winds near 30 knots (33 mph). 91S was moving west-southwest near 3 knots (4 mph) and it is currently about 630 nautical miles north-northwest of Port Hedland, Australia.
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