Hawaiʻi braces for life-threatening flooding as Pacific heat fuels forming tropical storm

Hawaiʻi is bracing for a tropical storm with wind gusts potentially reaching 100 mph.

On Thursday, the storm was moving toward the islands at 9 mph. Tropical Storm Lala could create dangerous conditions, including life-threatening flooding, damaging winds, and hazardous ocean conditions.

Forecasters say the storm is likely to intensify as it heads toward the Big Island, fueling concern that conditions for residents and travelers could deteriorate rapidly.

Here's what to know

According to The Washington Post, Lala is forecast to bring dangerous ocean conditions, damaging winds in parts of the state, and heavy rain to Hawaiʻi. The storm could strengthen into a hurricane as it nears the Big Island on the morning of Aug. 15, with hazardous weather beginning Friday night.

"Tropical Storm Lala is expected to produce rainfall totals of 5 to 10 inches across Maui and the Big Island with maximum totals of 25 inches possible across the Big Island. Rainfall totals of 2 to 4 inches with maximum amounts of 8 inches across the remainder of the island chain. This rainfall may produce life-threatening flooding and mudslides, especially in areas of steep terrain," the National Hurricane Center said, per the Post.

More background

Powerful storms can overwhelm drainage systems, trigger dangerous flash flooding, knock out power, and make roads impassable in a short time. The economic fallout can also be severe, especially in communities that rely on tourism, local small businesses, agriculture, and transportation.

The danger is not limited to rainfall. Hazardous surf and rough marine conditions can threaten coastal communities, boaters, and beachgoers, while strong wind gusts can bring down trees, damage buildings, and disrupt transportation.

Hawaiʻi's steep terrain can quickly funnel rainwater downhill, increasing the risk of flooding and landslides, while coastal areas can be exposed to dangerous surf and erosion.

What can be done?

Residents should monitor local forecasts and emergency alerts, charge phones and backup batteries, and secure outdoor items. Don't wait until heavy rain or strong winds begin to start preparing.

People in flood-prone or coastal areas can also gather essentials early, including drinking water, medications, flashlights, pet supplies, and important documents. If roads flood, drivers should not try to pass through standing water, which can hide damage and become deadly quickly.

Anyone with travel or outdoor plans in Hawaiʻi on Aug. 15 or Aug. 16 should be prepared for rapid changes. Hazardous surf and rough seas can make beaches and boating unsafe, while mountain and low-lying routes may become dangerous if rainfall intensifies.

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