Hurricane Douglas continues to threaten the Hawaiian Islands this Sunday afternoon. This is the first time a hurricane has ever been in these particular waters (since records have been kept). A hurricane has not made landfall in Hawaii since Iniki in 1992, which hit just after the filming of Jurassic Park. There’s actually some good info on wikipedia about that storm that can be found here https://en.wikipedia.org/wiki/Hurricane_Iniki
Sirens are sounding in Maui at this hour, warning residents to seek shelter. These are the same sirens that are normally used for tsunami warnings.
The satellite imagery below was posted by Ryan Ozawa (@hawaii) on Twitter and are described as “animated infrared and water-vapor satellite images through 8 a.m. this morning. Images via Mauna Kea Weather Center.”