The forecast indicates that mariners in the Massachusetts and Rhode Island coastal waters, including Block Island Sound, should prepare for gusty winds and changing sea conditions. Winds are expected to reach up to 20 knots tonight and increase to 25 knots by Monday. Seas will range from 2 to 4 feet, with individual wave heights potentially exceeding these averages. The chance of showers tonight and into the weekend could further reduce visibility and create challenging conditions for small vessels.