The National Weather Service dropped flash flood watches and tropical storm warnings in the main Hawaiian islands and surrounding waters but posted warnings and hurricane watches for the Papahanaumokuakea Marine National Monument as Tropical Storm Ana moved into the Northwestern Hawaiian islands.

Officials from the National Weather Service said that Ana is slowly weakening and has sustained winds of 65 mph, down from 70 mph earlier Monday.

At 11 a.m. Monday, the center of the storm was about 310 miles west-southwest of Lihue and 395 miles west of Honolulu. The tropical storm force winds extend 105 miles from the center. 

Ana began a turn toward the northwest at about 8 mph.

Ana is expected to remain a tropical storm through Tuesday and could intensify back into a hurricane on Wednesday.

The forecast for Oahu and Kauai County calls for mostly cloudy skies with showers and a slight chance of thunderstorms Monday. Maui County and the Big Island can expect clearing skies with scattered showers.

Ana is leaving a lot of humidity in its wake and forecasters expect a return of unseasonable hot and humid weather with light winds.

The humid conditions could also create afternoon showers in leeward areas and mauka slopes through the end of the week.

Waves generated by Ana combined with a northwest swell from a storm in the North Pacific also prompted ta high surf advisory until 6 a.m. Tuesday.

Surf of 10 to 15 feet was expected along north-facing shores of Oahu, Kauai County, Maui, Molokai and the Big Island. 8 to 10 foot faces were forecast for west shores and south shores of Kauai and Niihau should have 5 to 8 foot surf.