The threat on Hawaii from the tropics will not end with Iselle as Hurricane Julio continues to head to the west-northwest across the Pacific this week.
Julio is located about 950 miles to the east of Iselle and is forecast by AccuWeather.com meteorologists to take a path just north of Hawaii later this coming weekend.
According to AccuWeather Hurricane Expert Dan Kottlowski, "Julio will be passing over cooler waters compared to Iselle and is forecast to weaken to a tropical storm late this week before nearing Hawaii waters."
The weakening will follow initial strengthening that took place at midweek. Julio reached Category 2 hurricane strength (96-110 mph) Thursday morning.
Based on the expected track and strength of Julio, impacts will be much less severe on the islands as a whole, when compared to Iselle. However, there will still be a period of rough seas, a few downpours and perhaps gusty squalls pushing westward across the islands as a plume of showers and thunderstorms is likely to extend south of the system.
Substantial rainfall may occur on parts of the islands that typically experience little rainfall and light winds. Usually, these areas along the southern and western slopes of the islands are fairly dry due to prevailing northeasterly trade winds.
Rain, wind and seas could be more severe from Julio if the system tracks farther southwest than currently expected, so be sure to check back frequently with AccuWeather.com on the storm's path.
"If the high pressure area to the north turns out to be stronger, it could force the weakening tropical cyclone to take a path much closer to the Islands," Kottlowski said.
Such a scenario would be aggravated by Iselle passing nearby a few days earlier. Some communities may still be without power and isolated from the outside world if roads were washed out or blocked by debris.
While Iselle threatens to be the first hurricane to make landfall on the Big Island since reliable record keeping of tropical systems began in 1950, there have been multiple threats and impacts from the tropics on the islands several days apart over the past 60 years.