It’s not going to get worse – at least for Miami-Dade, Broward and Palm Beach counties.

By early afternoon Sunday, forecasters said Isaac had probably delivered its biggest and windiest punch – with gusts along the coast peaking at 55 mph overnight but considerably less inland. More gusty bands could still roll across mainland South Florida but they were unlikely to get stronger, said Robert Molleda, warning coordination meteorologist for the National Weather Service’s Miami office.

“The strongest winds we’ll get are going to come now and this afternoon,’’ said Molleda during a 12:30 p.m. phone briefing.

The Florida Keys, however, will remain under the gun for most of the day as Isaac approaches, still with potential to reach Category 1 hurricane strength at or near Key West.

Molleda said that a slight shift westward in Isaac’s track had kept the strongest winds around the storm’s still disorganized core away from the mainland. He cautioned that fast-moving squall lines could still generate for much of the evening. But he predicted that tropical storm force gusts would largely clear the Southeast coast by midnight.

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