Raking clouds
Bleah. Summer made a brief appearance for a couple of weeks, and now we're back in March again. 12 hours of rain, totalling .6 inch so far. At least there's no wind.
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This is the weirdest picture I've ever seen in 30 years of watching radar! (Screencap from NWCN.com)
Reminds me of a cloud rake. How do those 50-mile wide ripples form?