Tropical Storm Moke to dump heavy rain on Hawaii’s Big Island just a week after Hurricane Lala
Tropical Storm Moke to Dump Heavy Rain on Hawaii’s Big Island
Earthguardiansonline.com – Tropical Storm Moke to dump its heaviest precipitation bands over the Big Island and Maui within days of Hurricane Lala’s devastation. Residents across the archipelago are being told to prepare for a second tropical system that arrives while roads are still littered with debris, power lines remain down, and drainage channels are clogged. Meteorologists stress that the principal hazard this time is rainfall, not wind. Because the soil is already saturated from last week’s event, the National Hurricane Center warns that even modest additional rain can trigger “life-threatening flooding and mudslides.”
“Life-threatening flooding and mudslides” — National Hurricane Center advisory language
What Forecasters Are Watching
A flood watch covers the Big Island through Monday afternoon. Projected totals run five to ten inches across the island, with central and eastern slopes potentially receiving up to fifteen inches. Maui should accumulate four to six inches. The remaining islands face lower amounts — generally one to two inches — though isolated pockets could reach four inches, a figure that carries genuine danger on steep volcanic terrain.
Timing compounds the risk. On the Big Island and Maui, precipitation is expected to intensify by Sunday afternoon. The other islands will see the system’s rain spread later Sunday night into Monday. For communities still clearing debris and assessing structural damage from Lala, this compressed window leaves little room to sandbag, relocate vehicles, or stage emergency crews.
Why the Terrain Amplifies Every Inch of Rain
The islands’ dramatic elevation changes act as a natural rain machine. Moist trade winds striking the steep slopes of the Big Island and Maui are forced upward rapidly; the air cools, its moisture-holding capacity collapses, and water condenses out in intense precipitation bands. This orographic effect means a moderate tropical system can produce rainfall totals rivaling those of far stronger storms hitting flatter terrain. When the ground has already been soaked once in the past week, runoff and slope failure become far more probable at lower rainfall thresholds.
Track and Wind Outlook
Forecast models place the storm’s center roughly 250 miles south of the Big Island during its closest approach later Sunday. That corridor mirrors the general path Lala followed last week, though Moke is expected to remain a tropical storm throughout its passage — considerably weaker and farther offshore than Lala, whose eyewall brushed the southern coast while its center sat only about 30 miles out.
The strongest winds associated with the system are projected to stay offshore. A wind advisory nonetheless covers portions of Maui, Molokai, Lanai, Kahoolawe, and the Big Island until 6 p.m. HST Sunday. Gusts of up to 55 mph are possible — enough to down trees, snap power lines, and scatter debris across already-stressed roadways.
Hawaii Volcanoes National Park Closes Again
Hawaii Volcanoes National Park shut its gates on Friday and will remain closed until further notice. The decision lands against a backdrop of incomplete recovery: the park still lacks electricity, internet connectivity, and telephone service following Lala’s passage. Many employees remain in the process of recovering from that storm, both physically and logistically. Closing again before systems are restored compounds staffing shortages and delays in reopening trails, visitor centers, and monitoring stations.
FAQ
When will the heaviest rain arrive? On the Big Island and Maui, peak rainfall is forecast for Sunday afternoon. The remaining islands will see the system’s rain spread later Sunday night into Monday.
How much rain should residents expect? Five to ten inches across the Big Island, up to fifteen inches on central and eastern slopes, four to six inches on Maui, and one to two inches on the other islands (isolated pockets up to four inches).
Is the wind danger significant? Gusts up to 55 mph are possible, but the primary threat is flooding and mudslides, not wind. A wind advisory is in effect until 6 p.m. HST Sunday for several islands.
What should residents do now? Monitor National Weather Service updates, move vehicles off flood-prone roads, avoid river crossings and low-lying areas during peak rainfall hours, and keep sandbags or barriers ready for properties in the central and eastern slopes of the Big Island where fifteen-inch totals are possible.
Why is a second storm in one week unusual? Hawaii’s small land area and the vast surrounding ocean basin mean most tropical systems pass without landfall. Consecutive impacts within a single week are uncommon, and the cumulative toll on drainage capacity, slope stability, and emergency-response resources is disproportionate to either event alone.
