Surf, shore by shore

The National Weather Service Surf Zone Forecast, read the way it is read here: face height in feet, by the direction a shore faces. Bars are on one scale across every island, so you can see at a glance which coasts are dangerous and which are merely big.

Vog and box jellyfish

Two hazards that have nothing to do with any storm and turn up on their own schedule. One is measured; the other is a rhythm you can count on a calendar.

Vog

Volcanic haze from Kīlauea, carried around the state by the trades. Worst on the Kona and Kaʻū side, where the wind wraps it down the leeward coast.

Box jellyfish

The most predictable hazard in Hawaiʻi, and the one most visitors are stung by.

Satellite and station loops

The GOES-18 satellite view and the individual NWS station loops. The live map above is the better tool for where the rain is right now; these show the wider picture and let you check one station at a time.

Earthquakes and volcanoes

Hazards that have nothing to do with the weather. Straight from the USGS — earthquakes in the last 24 hours, and the volcano alert level whenever Kīlauea or Mauna Loa sits above normal.