Tropical Storm Moke to dump heavy rain on Hawaii’s Big Island just a week after Hurricane Lala
Tropical Storm Moke to Dump Rain on Hawaii
Goldlaner.com – Just seven days after Hurricane Lala tore through the Hawaiian archipelago, Tropical Storm Moke to dump another round of heavy rain onto saturated Big Island terrain. The weaker system is tracking south of the island chain and will make its closest approach later Sunday, with its center roughly 250 miles south of the Big Island. Forecasters are clear that wind is not the primary threat here — prolonged, intense rainfall landing on already-flooded ground is.
Rainfall Outlook and Timing
The National Hurricane Center has issued a flood watch covering the Big Island through Monday afternoon. Accumulated totals are projected at 5 to 10 inches across much of that island, with central and eastern slopes potentially reaching 15 inches. Maui should see 4 to 6 inches, while the remaining islands face generally lighter amounts of 1 to 2 inches, though isolated pockets could top 4 inches.
Timing sharpens the danger. Rain is expected to intensify over the Big Island and Maui by Sunday afternoon before spreading to the other islands from late Sunday night into Monday. The same drainage basins, low-lying neighborhoods, and stream corridors that flooded during Lala’s passage last weekend are now being targeted again, giving the ground essentially zero time to dry out or regain absorption capacity.
“Life-threatening flooding and mudslides” can be triggered by far less rainfall than usual when soils are already saturated, the National Hurricane Center cautioned.
Why Volcanic Terrain Amplifies the Threat
Hawaii’s steep ridgelines act as a natural multiplier for tropical moisture. Incoming trade winds are forced upward, cooling the air and stripping out water vapor at rates several times higher than over flat terrain. A system that might deposit a manageable 3 inches over open ocean can unload 15 inches on a windward slope within hours. Layer pre-wetted soils, eroded stream banks, and compromised retaining structures from Lala’s passage on top of that, and even moderate rainfall becomes a flash-flood and landslide trigger.
Residents in valley communities, along the Hilo and Kona coasts, and near stream crossings should monitor local alerts closely. The window between “heavy rain” and “road washed out” can be measured in minutes in these settings.
Wind and Surf Impacts
The strongest sustained winds associated with Moke are expected to remain offshore. A wind advisory nonetheless covers portions of Maui, Molokai, Lanai, Kahoolawe, and the Big Island until 6 p.m. HST Sunday. Gusts up to 55 mph are possible — enough to down limbs, scatter debris, and create hazardous driving conditions on exposed ridgelines. Coastal surf will also be elevated, raising the risk of rip currents and beach erosion during the event.
Hawaii Volcanoes National Park Remains Closed
The park shut down on Friday and will stay closed until further notice. The decision predates Moke’s arrival but also reflects lingering damage from Lala. Electrical power, internet connectivity, and telephone service remain offline following last week’s storm. Many staff members are still dealing with personal losses and workplace disruptions before normal operations can resume. Reopening will depend on both infrastructure restoration and confirmation that trails, roads, and visitor facilities are safe.
How Moke Compares to Lala
Both systems approach from the south-southwest and pass south of the main islands, but the differences matter. Lala’s eyewall brushed the southern coast of the Big Island with its center only about 30 miles offshore, delivering hurricane-force winds directly onto land. Moke, by contrast, is forecast to maintain tropical-storm intensity throughout its passage and will stay roughly 250 miles south at closest approach. That distance translates into substantially weaker onshore winds and a different rainfall pattern: broader, more prolonged soaking rather than the concentrated, short-duration downpour of a hurricane’s eyewall.
The cumulative effect of two storms in under a week is what makes this situation genuinely dangerous. Infrastructure that survived Lala’s winds may not survive a second round of saturated-soil loading. Drainage systems clogged by debris from the first event will perform worse during the second. Communities that have already lost power, water, or road access face compounding vulnerabilities with little recovery time between events.
Frequently Asked Questions
When will Tropical Storm Moke hit closest to Hawaii? The storm’s center is forecast to pass roughly 250 miles south of the Big Island later Sunday. Rain effects will be felt across the islands from Sunday afternoon through Monday.
How much rain should Big Island residents expect? Most of the island should receive 5 to 10 inches, with central and eastern slopes potentially reaching 15 inches. Because soils are already saturated from Lala, even the lower end of that range can produce flash flooding and mudslides.
Is Hawaii Volcanoes National Park open? No. The park closed on Friday and remains shut until infrastructure is restored and trails, roads, and facilities are confirmed safe. No power, internet, or telephone service is currently available inside the park.
What should residents do before Sunday afternoon? Move vehicles out of low-lying areas, clear gutters and drains of debris left by Lala, charge phones and backup power sources, and review your family’s evacuation routes. Monitor NHC updates and local county alerts continuously from Sunday morning onward.
