Rain is already marching across Honolulu this morning, dragging along haze and scattered downpours that are expected to hang on through Saturday, February 21. Forecasters say showers and isolated thunderstorms are likely through the afternoon, and the heavier bursts could trigger rapid runoff and localized street flooding right in the middle of the commute.
Flood Watch and Flash Flood Risk
According to the National Weather Service, a Flood Watch is in effect for Niʻihau, Kauaʻi and Oʻahu through Saturday afternoon, until about 6:00 PM HST. Flash flooding remains possible on flood-prone roads, in low-lying neighborhoods and in urban drainage areas. A watch means conditions are favorable for flash flooding, and residents should be ready to move quickly if Flash Flood Warnings are issued.
What To Expect Today
Skies will stay mostly cloudy, with a high near 80°F and a low around 69°F tonight. Showers and a few thunderstorms are on tap, with the chance of rain running around 60 to 70 percent. When heavier cells roll through, they could drop between a half and three-quarters of an inch of rain in short bursts, with locally higher amounts still on the table.
Commute And Safety Tips
Drivers should plan for slick roads and slower-than-usual commutes, and skip the shortcut through those familiar puddle-prone spots. Avoid driving through standing or flowing water, and move vehicles out of known low areas when you can. Keep your phone charged, follow local county alerts, and remember the well-worn but accurate advice: if water is rising, “turn around, do not drown.”
Short-Term Outlook
The upper-level trough fueling today’s showers is expected to lift north later Saturday, which should ease the rain tonight and bring lighter winds into the weekend. Trade winds are forecast to strengthen again Tuesday into Wednesday, and marine forecasts call for a building north-northeast swell beginning Monday night that could push surf higher along exposed east- and north-facing shores.
Earlier Coverage
We covered the developing flood watch for Kauaʻi and Niʻihau yesterday; this update extends that coverage to reflect the watch now including more of Oʻahu, along with county-level preparedness guidance.
