Yes! Real snow in Hawaii! It is quite common for snow to fall on Mauna Kea on the Big Island of Hawaii. At nearly 14,000ft in elevation when measured from sea level, Mauana Kea is Hawaii's tallest mountain and is home to a number of observatories. Being that high, though, it is subject to frequent snow during the winter! It is quite possible to even ski on Mauna Kea when the conditions are right (though there are no ski lifts). Interesting fact, when measured from its true base on the ocean floor, Mauna Kea is actually the tallest mountain on earth, measuring over 33,000ft.
Anyway, what's unusual about this most recent snow warning is that it also applies to Mauna Kea's immediate neighbor, Mauna Loa and Maui's Haleakala. Mauna Loa is a bit 13,000ft in elevation, so it's a bit lower than Mauna Kea, and sees a little snow here and there. On the other hand, Haleakala is only 10,000ft, and while it does see ice from time to time, snow is very uncommon there!