Clear Up
The sun is out, the sky is blue, things have begun to clear up!
Look into the blue sky and imagine the clouds parting as the weather clears up and you can see the sun. Gorgeous! The beauty is so great you have to squint.
せい
は
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Now that it's starting to clear up you can't help but laugh. "Ha (は)! Ha ha ha!" you laugh up into the sky. The sun feels great on your face, making you feel lively! And that blue sky ain't too shabby either.
Say the "ha ha ha" part out loud while you imagine the weather clearing up. It'll help you to remember the reading of this kanji.