If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

* WHAT...Up to 1 1/2 ft of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Northwest Suffolk and Northern Nassau Counties. * WHEN...From 6 PM to 10 PM EDT Thursday. * COASTAL FLOOD IMPACTS...Minor flooding in the most vulnerable locations near the waterfront and shoreline. Expect up to 1 1/2 feet of inundation above ground level in low lying, vulnerable areas. Some roads and low lying property including parking lots, parks, lawns and homes/businesses with basements near the waterfront will experience shallow flooding. * SHORELINE IMPACTS...Breaking waves of 3 to 4 ft will cause dune erosion, localized washovers, as well as enhance splashover and flooding onto shoreline roads and properties.