Puna Weather
Wednesday 15th October 2025
Isolated showers today, and tomorrow with scattered to numerous showers both tonight and again Thursday night. Periods of scattered to numerous showers remain possible through the weekend. Winds light to moderate and from the east through the period.
A ridge to our north is forecast to maintain mostly moderate easterly trade winds over us through the weekend (surface animation). Bands of enhanced moisture embedded in the low level trade flow arrive on our shores beginning tonight and continue through the weekend... at least (moisture anomaly animation).
In the upper levels a trough to our north dives south nearer Kauai. Cooler air aloft associated with this trough is likely to decrease stability regionally. This means little or no inversion for us, allowing for thicker clouds and more persistent and heavier rainfall.
The freezing level remains above our mountain tops through the period and thunder should be confined to afternoons and over on our mountains.
Because the center of the trough is forecast to settle a good distance to our west, we'll be on the periphery of its influence. Small changes in the position of the upper level trough could make big differences in how much rain we get. As of 8am Mauna Kea hasn't recorded colder air yet (CFHT meteogram), but it's forecast to arrive something today.
