## What does 40 chance of rain look like?

If the forecaster is only 50% sure that precipitation will occur, and expects that, if it does occur, it will produce measurable rain over about 80 percent of the area, the PoP (chance of rain) is 40%.

( PoP = .

5 x .

…

So a 50% chance of rain means that half of your day will get rain..

## Is a 30 percent chance of rain high?

The forecast of a 30 percent chance of rain can mean all of the area will get rain if it rains, but the forecaster has only a 30 percent confidence that rain will indeed arrive. It can also mean that scattered rain is a certainty, but it will affect only 30 percent of the area.

## What does 70% rain mean?

To answer you question, “70% chance of rain” does not mean it will rain all day. It means there is a 70% CHANCE that it will rain at some point – maybe a 10 second sprinkle, maybe a four hour downpour – or maybe you’ll get lucky and it won’t rain at all.

## What does 40 percent chance of snow mean?

A 40 percent chance of snow means the forecaster believes you will experience snow 4 out of every 10 times you hear such a forecast (assuming the forecasts verify perfectly). … For example, in a given situation, scattered thunderstorms are expected, but only 40 percent of the area will receive rain.

## Is 40 rain a lot?

When your local forecaster says 40%, they mean for an area, usually for the local forecast or viewing area and for a certain time. Basically what they are saying is that in a forecast that suggests a 40% chance of rain, 40% of the forecast area will receive rainfall during the specific forecast period.

## How is rain percentage calculated?

Here is how the National Weather Service breakdowns the math: “PoP = C x A where “C” = the confidence that precipitation will occur somewhere in the forecast area, and where “A” = the percent of the area that will receive measurable precipitation, if it occurs at all.”