Re: Probability of precipitation


"Bill DeWitt" <bill@xxxxxxxxxxx> wrote in message
news:37qdnWQTyNRnSy7eRVn-iA@xxxxxxxxxxxxxxx
> Jack Crane mentioned in passing :
> >
> > What do the probabilities of precipitation mean in weather forecasts?
> > I THINK that, say, 60% means ...
>
> "out of one hundred times we have had conditions similar to these, we
> have had rain sixty times"
>

When conditions were 'similar' within the numerical forecast model's
developmental data set , measureable precipitation (>= 0.01") was observed
60% of the time.


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