High pressure far northeast will drive trade winds today. Wind speeds will taper off through much of this week as remnant of Tropical Cyclone Genevieve linger between the high and Hawaii. Clouds and showers will favor windward and mauka areas, with some enhancement possible for the western half Tuesday through Thursday due to an upper trough setting up to the west.
A 1032 mb surface high centered far northeast of Hawaii will drive breezy trade winds today. Winds will carry in scattered low clouds and showers focusing across windward slopes. Wind speeds will decline to gentle to moderate through much of the week as remnants of Tropical Cyclone Genevieve linger between Hawaii and the high pressure system. Genevieve is still a Tropical Storm as of this morning, but is expected to become post-tropical by the end of today. It is not expected to impact Hawaii aside from the decrease in wind speeds.
Model guidance continue to show an upper level trough near the western end of the state Tuesday through Thursday, which may provide some enhancement of incoming trade wind clouds and showers over the western half of the state. This feature will move north away from the area on Friday.
Generally VFR with slowly weakening but still breezy trade winds. Occasional MVFR ceilings and visibilities in isolated stronger showers mainly over windward and upslope mauka exposures.
Breezy to locally windy trades resulting in moderate low level turbulence over and immediately S through W of mountainous terrain will keep an AIRMET Tango in effect this morning.
A high pressure system north of the Hawaiian Islands will weaken over the next few days, decreasing trade wind speeds from moderate to strong range today into the gentle to fresh range from Monday through Thursday. The Small Craft Advisory (SCA) coverage was lowered earlier this morning to the typical windier waters and channels near Maui and the Big Island. Winds are expected to decrease below SCA thresholds by Monday.
Surf along south facing shores will stay below seasonal averages with mainly background energy throughout most of this week. The next small, long period south swell will arrive by Saturday with a slight bump in south shore surf heights through next weekend. Possibly a larger long period south swell arriving early next week.
East facing shores will remain rough and choppy today due to a combination of strong trade wind waves and a small, medium period easterly swell generated from Tropical Storm Genevieve that will linger for next few days.
Surf along north facing and west shores will remain flat to tiny through the forecast period except for areas exposed to the easterly trade wrap.
Small Craft Advisory until 6 AM HST Monday for Maalaea Bay- Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters.
