Photo credit: Brendan Stephen
west kauai
today: Breeze. It will be sunny in the morning and partly sunny with showers in the afternoon. Highs will be around 90 degrees near the coast and around 78 degrees above 3,000 feet. East winds reaching 20 mph. The chance of rain is 20%.
tonight: Most of it is clear. Breeze. Scattered showers after midnight. Lowest temperatures will be around 72 degrees near the coast and around 62 degrees above 3,000 feet. Northeast winds reaching 20 mph. The chance of rain is 40%.
on Monday: Mostly sunny. Breeze. Highs will be around 90 degrees near the coast and around 79 degrees above 3,000 feet. East winds reaching 20 mph.
South Kauai
today: Breeze. Mostly sunny with some isolated showers. High temperature 83 to 90 degrees. The chance of rain is 20%.
tonight: There's a gentle breeze. Partly cloudy with scattered showers in the evening, cloudy with scattered showers after midnight. The lowest temperature is about 74 degrees. The chance of rain is 50%.
on Monday: Breeze. It will be partly sunny with scattered showers in the morning, and mostly sunny with scattered showers in the afternoon. Highest temperature 82 to 89 degrees. The chance of rain is 50%.
kauai mountains
today: Mostly clear in the morning then becoming partly clear. Scattered showers. Highest temperatures in the valley range from 76 to 86 degrees, and about 68 degrees above 4,000 feet. East winds reaching 15 mph. The chance of rain is 40%.
tonight: Cloudy with scattered showers in the evening, cloudy with scattered showers after midnight. Lowest temperatures range from 65 to 71 degrees in the valley and around 59 degrees above 4,000 feet. East winds reaching 15 mph. The chance of rain is 70%.
on Monday: There's a gentle breeze. Partly sunny with scattered showers. Highest temperatures range from 76 to 86 degrees in the valley and around 67 degrees above 4,000 feet. East winds reaching 15 mph, increasing to 10 to 20 mph in the afternoon. The chance of rain is 50%.
North Kauai
today: Mostly sunny with some isolated showers. The maximum temperature will be 79 to 91 degrees. The chance of rain is 20%.
tonight: Partly cloudy with scattered showers in the evening, cloudy with scattered showers after midnight. Lowest temperatures range from 66 to 74 degrees. The chance of rain is 50%.
on Monday: There's a gentle breeze. Partly sunny with scattered showers. The maximum temperature will be 78 to 91 degrees. The chance of rain is 50%.
East Kauai
today: Mostly sunny with some isolated showers. The maximum temperature will be 76 to 88 degrees. The chance of rain is 20%.
tonight: Partly cloudy in the evening, becoming mostly cloudy. Scattered showers. Lowest temperature 66 to 77 degrees. The chance of rain is 50%.
on Monday: Partly sunny with scattered showers. High temperature 75 to 87 degrees. The chance of rain is 50%.
summary
Trade winds will gradually increase over the next few days, with a steady pattern of windward showers dominating. A moving batch of moisture in the trade winds will lead to an increase in showers Monday night and Tuesday. Trade winds are expected to increase on Wednesday and Thursday, bringing dry conditions.
discuss
There will be steady, moderate to locally breezy trade winds tomorrow. About 1300 miles north of the state there is a fairly solid 1033 mb. A trough of low pressure south of the high-voltage line makes the pressure gradient and associated trade winds slightly weaker than expected from the high-voltage line. As the troughs fill up, the trade winds will gradually increase. The mid-mountain ridge over the islands will maintain stable conditions, with dry air slowly moving into the region from the east as a shallow batch of moisture moves westward today. Moderate rainfall will be concentrated on windward slopes, with leeward slopes expected to be mostly dry. The exceptions will be the Kona slopes on the Big Island, where clouds and showers will linger each afternoon, while leeward Kauai could see a few brief showers this afternoon.
Shower activity will increase Monday night and Tuesday as another batch of moisture moves into the trade. This area will be deeper than the area that passed yesterday, indicating a higher chance of showers, especially in windward areas. The leeward slopes of the Big Island, and possibly Haleakala, may become active Tuesday afternoon, while leeward areas elsewhere will experience some showers. Mid-level troughs will be accompanied by moisture, but conditions aloft will generally remain stable, minimizing the chance of heavy rainfall.
Wednesday and Thursday will bring drier conditions and stronger trade winds as a mid-level trough removes and an area of high pressure establishes to the north. Windward rainfall is expected to be minimal and dry in most leeward areas.
aviation
Moderate trading will remain in place over the next few days. Clouds and showers will favor windward areas and mountains and overnight. Additionally, clouds and showers appear on the Kona slopes of the Big Island every afternoon. Some showers may bring brief MVFR conditions. Otherwise, VFR shall prevail.
No AIRMET is currently in effect.
ocean
A high pressure system is strengthening north of the Hawaiian Islands, and trade winds will remain in the fresh to locally strong range for much of the week. Trade wind speeds will be sufficient to support Small Craft Advisory (SCA) conditions in windy waters and waterways near Maui and the Big Island. The SCA's hours were extended in time until Tuesday. More water may be added later this week as wind speeds increase.
The background south swell pulse of energy is expected to continue, with waves remaining below average for much of the week. Small, choppy waves will increase along the eastward coast as locally strong trade winds increase over the next few days.
King tides will peak this afternoon, with local tide gauges showing water levels still about half a foot above guidance and at least 1 foot above the mean high water (MHHW) threshold for Hilo, Kahului and Honolulu. A Coastal Flood Statement for isolated minor flooding remains in effect Monday evening.
fire weather
Typical summer trade wind weather patterns will continue into Monday, followed by wetter conditions Monday night and Tuesday. On Wednesday and Thursday, trade winds will strengthen and conditions will become dry and stable. This could cause some fire weather issues.
HFO Observations/Warnings/Recommendations
A small craft advisory is in effect for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, leeward waters of the Big Island, and waters southeast of the Big Island until 6 p.m. HST Tuesday.
Data provided by NOAA.gov
