With luck, clouds will clear tonight and give us a good look at Sunday morning's peak of the annual Leonid meteor shower. This display is one of the year's best, averaging 15 meteors per hour where skies are darkest. Dust from Comet 55P/Tempel-Tuttle smacks the atmosphere at 44 miles per second, making Leonids fast and bright. Half leave persistent trains. No moon will interfere, but get as far as possible from urban lighting. Best time to look: from 2 a.m. until skies brighten.