You hardly ever see the intensity listed at 55 mph, since by a quirk in the conversion scheme, 45 knots=50 mph and 50 knots=60 mph. I guess they have some wiggle room in the intermediate advisory, since that product only lists the intensity in mph. I assume the intensity will be "up" to 60 mph in the next advisory for this reason. I don't know if the next plane will be in there in time to give an update before the next advisory, which is due in 30 minutes.
The 12Z SHIPS brings Ernesto up to minimal hurricane strength, if you interpolate between the 12 hr (when it hasn't made landfall yet) and 24 hr (after landfall) forecasts.
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