Astronauts and weather satellites are watching closely as Hurricane Lane, a massive storm, threatens Hawaii.

The hurricane, which is forecast to begin pummeling the islands later today (Aug. 22), has already prompted the governor of Hawaii to declare a state of emergency, and views from space offer a shocking look at just how daunting the storm is. It was briefly a Category 5 storm but has now been downgraded to a Category 4.

Today, NASA astronaut Ricky Arnold tweeted two photographs showing the view of the storm from the International Space Station and offered best wishes to people in Hawaii.

Hurricane Lane, which was briefly a Category 5 storm, was seen by satellites on Aug. 22.
Hurricane Lane, which was briefly a Category 5 storm, was seen by satellites on Aug. 22.
Credit: NOAA

NASA's Twitter account dedicated to the space station also shared a video showing the huge size of the hurricane. The video includes two different perspectives from the space station, both of which highlight the clear eye of the storm at the heart of the giant knot of clouds.

Right now, meteorologists are expecting that the storm's center will pass uncomfortably close to the state between today and Saturday (Aug. 25).

Hawaii is expected to experience extremely powerful winds, heavy rain, storm surge and potentially even tornadoes and waterspouts as the hurricane progresses, according to a statement from the National Oceanic and Atmospheric Administration's (NOAA) National Weather Service.

A fleet of government satellites is also working to support the meteorologists watching Hurricane Lane strengthen and approach Hawaii.

Those include NASA's Terra satellite, which gathers infrared data that tells scientists how hot storm clouds are — a crucial piece of information for understanding the probability of serious thunderstorms and heavy rainfall.

The Geostationary Operational Environment Satellite, which is operated via a partnership between NASA and NOAA, is also hard at work observing the storm using visible and infrared light and watching for flashes of lightning.

A third satellite, co-run with the Japan Aerospace Exploration Agency and called the Global Precipitation Measurement mission, can build 3D models of the storm. The models will give scientists a better understanding of the cloud structure inside the hurricane.

Taken together, this satellite data can help meteorologists better predict what the storm will do and how the residents of Hawaii can stay safe.

Email Meghan Bartels at mbartels@space.com or follow her @meghanbartels. Follow us& @Spacedotcom, Facebook and Google+. Original article on Space.com.