Record rainfall rendered a portion of Kamehameha Highway impassable and prompted the closing of the Honolulu Zoo on Friday.

According to the National Weather Service, 1.14 inches of rain fell on Honolulu on Friday, breaking the old record of 0.73 inches set in 1965. Meanwhile, rain gauges in Kahului recorded 1.25 inches of rain, breaking the previous record of 0.62 inches set in 1990.

The weather service issued a flash flood watch for the state after dense tropical moisture over the state focused heavy rain over Oahu in the morning and Kauai in the afternoon. The watch was set to expire late Friday evening, but the weather service said it could be extended into Saturday if the heavy rain persists.

A flash flood warning for Windward Oahu was posted at 6:29 a.m., then canceled at 8:51 a.m. The Waikane Stream gauge showed water levels over a foot higher than flood stage as radar showed heavy rain over the Koolaus and the Windward area during that time, weather officials said.

The rain gauges for Hakipuu Mauka in Kaneohe and Waiahole recorded more than 1 inch of rain between 2 and 5 a.m. Friday.

Ponding led police to close Kamehameha Highway near Waiahole Stream for about an hour early Friday morning.

The Honolulu Zoo also cited heavy rain in announcing that it would remain closed Friday.

In the 24-hour period ending Friday at 5:45 p.m., rain gauges at the Oahu Forest National Wildlife Refuge recorded 5.61 inches of rain. Over the same period, heavy rainfall was also recorded in Poamoho (4.89 inches), Kahana (4.00), Moanalua (3.71) and Punaluu Stream (3.64).

On Kauai heavy rainfall was recorded at Mount Waialeale (5.67 inches), Lihue (4.87), Wailua (4.47) and Kapahi (4.37).

A flood advisory for Kauai expired at 6:30 p.m. Friday.

Despite the rain elsewhere on Kauai, temperatures in Lihue reached 85 degrees Friday, tying a record high for the date set in 1957.

The tropical moisture could bring potential for flash flooding into the weekend, according to the weather service. Forecasters said clouds and rain will continue into the weekend as tropical moisture interacts with a low forming near Kauai.

According to the weather service, the surface low will shift the potential for heavy rain and flooding to the western half of the state by today. The low is expected to move farther north Sunday, but it will trail a rain band over the islands that will linger into next week.

The band is expected to stall over the central islands Sunday, bringing clouds and showers, before moving over Maui County and Hawaii island Monday and Tuesday.

Tradewinds will return Tuesday night as a new high pressure builds northwest of the area, forecasters said.

A small-craft advisory was in effect for the Pailolo Channel, Alenuihaha Channel and Hawaii island windward and leeward waters through 6 a.m. today due to locally strong southeasterly wind.

Meanwhile a weakening north-northwest swell will continue to produce surf just below advisory levels along north and west shores of Oahu. Surf along north-facing shores is expected to reach 4 to 6 feet today. Surf along west shores is forecast at 2 to 4 feet.

Locally strong tradewinds and an easterly swell will result in rough surf conditions along east-facing shores through the weekend. Surf along east shores is expected to be 3 to 5 feet today, down from 4 to 6 feet Friday. Surf along south shores will be 3 to 5 feet, according to the weather service.

Surf heights are forecast heights of the face or front of waves. The surf forecast is based on the average height of the one-third largest waves at the locations of the largest breakers. Some waves may be more than twice as high as the significant wave height.

The weather service advises ocean users to expect rip currents in or near any surf zone.