This is not your usual weather forecast. Big storms are brewing. Your umbrella won't help, but you might want to keep a flashlight handy.
These storms are coming from the sun. It's raining down a huge amount of radiation. We're safe, but it could affect power grids, radios and satellites.
Experts say the combined energy from two recent solar events will arrive at Earth on Saturday, prompting the Space Weather Prediction Center to issue a strong geomagnetic storm watch.
Wait. What kind of watch? Basically, the sun is a giant ball of gas: 92.1% hydrogen and 7.8% helium. Every now and then, it spits out a giant burst of radiation called a coronal mass ejection.
These ejections are sometimes associated with solar flares, the most explosive events in the solar system. The sun has released two ejections in the past two days, and both are linked to solar flares. NASA says the second flare is an X1.6 class, putting it in the most intense category.
The energy from those two ejections is heading toward Earth.
Space weather experts aren't sure what this solar storm will do.
"This is a pretty strong solar storm, and we just won't know until it gets here" what it will do, said CNN meteorologist Chad Myers.
Earth's atmosphere usually protects us humans, but you might want to keep a flashlight handy. Solar storms can knock out power, interfere with GPS and radio communications -- including those on commercial airliners -- and damage satellites.
Big solar storm heading toward Earth 
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