A low-pressure system moving southward from the northwest of Hawai'i is bringing scattered showers and possible thunderstorms to O'ahu. The National Weather Service reports this pattern is expected to continue on Wednesday. Southerly winds with the front will increase humidity and precipitation across the state.
A weather system, currently 800 miles northwest of the state's capital, is expected to move closer, bringing increased weather activity, particularly for Kauai, where a flood watch begins at noon today. Both GFS and ECMWF models predict heavy rain, with ECMWF showing higher levels. "Precipitable water (PW) values well above normal (1.5 to 1.7) over the western islands" are expected, with Lihue’s PW rising from 1.18 to 1.59 inches. This could bring heavy showers and possible thunderstorms to Kauai. Other areas will experience "some showery conditions" and warm, humid weather. O'ahu may see some downpours in the afternoon and early evening, according to the National Weather Service.
A low-pressure system is developing northwest of Kauai, causing changes in weather conditions. The National Weather Service states, "Winds will veer southerly in advance of a developing low pressure system to the northwest of Kauai today," and "MVFR/IFR conds will be possible in any SHRA/TSRA, otherwise VFR prevails." Mariners can expect moderate southeast winds and higher swells, with north and west-facing shores getting a boost from a northwest swell, and south-southwest shores seeing a small, long-period swell. A flood watch is in effect until Wednesday afternoon.
