(CNN) -- 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.
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