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## What does the percentage on weather mean?

What Does the Percentage of Rain Mean? According to a viral take on the internet, the percentage of rain doesn’t predict the chances of rain. Instead, it means **a certain percentage of the forecasted area will definitely see rain**—so if you see a 40% chance, it means 40% of the forecasted area will see rainfall.

## What does 30% mean on the weather app?

For example, a 30 percent **chance of rain** may mean 100 percent confidence that only 30 percent of the forecast area is going to get rain.

## What does a 80% chance of rain mean?

An 80 percent chance of rain (or of any other kind of precipitation) means the **weather forecaster believes there will be an eight in ten chance (or 80 chances out of 100) of measurable precipitation (0.01 inch or more)** in the area under consideration during the time interval that is specified in the weather forecast ( …

## What does 40% mean on weather app?

If a forecaster is only 50% certain that precipitation will happen over 80 percent of the area, **PoP (chance of rain)** is 40% (i.e., . 5 x . 8). Meteorologist Troy Kimmel has a detailed discussion of this meaning of PoP online.

## Does 60% chance of rain mean it will rain?

If they say 60% chance of rain, **60% of their area will experience rain at some point during the forecast period**. … Likewise, 20% chance of rain means you’re unlikely to see any rain at all today, or 20% of the area is going to be drenched.

## Is 70 percent chance of rain high?

It’s easy to think that a 70 percent chance of rain means **a pretty hefty rainfall is likely**, and a 20 percent chance means that only a little rainfall is on the way. But that would be wrong, too. Probability of precipitation doesn’t tell you anything about how long it is going to rain or how much it is likely to rain.

## How do weather percentages work?

One simple equation used among meteorologists is **P = C x A**, or the probability of precipitation equals the meteorologist’s confidence that it will rain, times the percentage of the area that is expected to get rainfall. … If we’re 50% confident that 100% of the Valley will get rain, then there’s a 50% chance of rainfall.

## Is 40 percent chance of rain a lot?

According to the National Weather Service, if you see a 40 percent chance of rain, “there is a 40 percent **chance that rain will occur at any given point in the area**.”

## What does percent chance of rain mean Reddit?

YSK that ‘X percent chance of rain’ doesn’t actually mean the chance of precipitation. It is worked out by **confidence x percentage of area getting hit by rain**. So, if the forecaster was 100 percent there would be rain, but only for 20 percent of the area, then the chance of rain would only be 20 percent.

## What does 50% chance of rain mean on weather app?

A 50 percent chance of rain means there is a 50 percent chance **for any one spot in the forecast area to get wet during the forecast period**.

## What does the percentage of rain mean on iPhone weather app?

What does the percentage of rain mean on weather forecasts and the iPhone app? … However, that’s not actually true – as the percentage **refers to the chance of rain falling in a specific region**, rather than how much rain might actually fall.

## What does a 10% chance of rain mean?

If there’s a 10 percent chance of rain, it means **the current conditions yield rainfall one out of every 10 times observed**. … It can be so small scale that one part of a county may get drenched with an inch of rain on a particular day while another portion of that same county stays completely dry.”