Updated 5 p.m., 8/5/2015

Pounding surf on east-facing shores over the next couple of days is the most severe hazard Hawaii will experience from Tropical Storm Guillermo, according to the latest National Weather Service forecast.

Tropical storm watches were discontinued Wednesday morning for Hawaii and Maui counties. There were no storm warnings or watches in effect as of Wednesday evening.

The storm was 400 miles east of Honolulu, roughly 250 miles east-northeast of Hilo at 11 a.m. Wednesday. Guillermo was moving west-northwest at 12 mph and was expected to continue on that trajectory.

By 5 p.m. Wednesday the storm’s progress had slowed to 10 mph, continuing in a west-northwest direction.

The center of the storm is expected to pass roughly 170 miles north of the Big Island on Thursday and 100 miles north of Oahu on Thursday night.

Wind speeds lowered throughout the day Wednesday to 50 mph by the 5 p.m. advisory. There were higher gusts, but winds are expected to steadily weaken over the next two days, according to the NWS.

Guillermo is expected to be downgraded to a tropical depression by Thursday night.

Heavy rain is expected through Friday morning but typical summertime weather is expected this weekend, according to the forecast. A flash flood watch has been canceled.

High surf warnings remain in effect in all four counties until 6 a.m. Thursday. The NWS cautioned that only “highly experienced persons” should enter the water.

The Department of Land and Natural Resources has closed Kalalau Trail on Kauai’s north shore due to the storm’s potential to bring heavy rains, which causes streams to rise and requires emergency rescues of stranded hikers.

The DLNR also closed Waianapanapa State Park on Maui due to high surf.

An image of Tropical Storm Guillermo shows its trajectory and forecast as it passes Hawaii. (NWS/NOAA)