By Paul Yeager, author of Weather Whys: Facts, Myths, and Oddities
Just a quick (off-topic) note to let you know that I’ll be on NPR’s popular Science Friday show tomorrow to join host Ira Flatow and fellow guests Andrew Fraknoi and David Mizejewski. The segment will be called Winter Wonderland? Wonder No Longer.
Everything Language and Grammar 
While the topic is on NPR, I’d like to mention that NPR forecasts frequently reference the chance of “a passing shower” or “a thunderstorm” instead of plural showers and storms. I notice in other weather venues that others sometimes do this as well. It’s been surprisingly difficult for a layperson to locate authoritative definitions and grammatical use of meteorological events, and I haven’t been able to find anyone discussing it.
When I hear it, I want to know the approximate time that I can expect that single black cloud in the sky that is responsible for the single shower or storm to be above me. Maybe I can take an alternate route home to avoid it.
I am always concerned about good weather because i always took photographs of landscape. –
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