Monday, May 9, 2011

Difference between isolated and scattered thunderstorms


Q: What’s the difference between isolated and scattered thunderstorms?
A: The National Weather Service expresses the probability of measurable precipitation (0.01 inch) for a given location using percentages and terms such as isolated and scattered. Isolated means a chance of precipitation of less than 30% and scattered is used for a 30% to 50% chance. Likely describes a probability of 60 percent or greater.
For more, see our FAQ page about understanding weather forecasts.
(Answered by Chris Vaccaro, public affairs specialist at the National Weather Service in Silver Spring, Md., May 31, 2005)

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