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If we’re just expecting a small storm or two, we’d say 20% of the area will see rain. On the other hand, if we’re expecting more widespread rain, the area that will see rain would be more like 70% or 80%.

## What does 30% rain mean?

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. … You can also get a roughly 30 percent POP with 80 percent confidence that 40 percent of the forecast area will get rain, and so on and so forth.

## What does percent chance of rain actually mean?

The official definition of the probability of precipitation by the National Weather Service is the chance of precipitation (rain, snow, etc.) occurring at any one spot in the area covered by the forecast. … If we’re 50% confident that 100% of the Valley will get rain, then there’s a 50% chance of rainfall.

## Is 20% a high chance of rain?

If we’re just expecting a small storm or two, we’d say 20% of the area will see rain. On the other hand, if we’re expecting more widespread rain, the area that will see rain would be more like 70% or 80%.

## Does 40% chance of rain mean it will 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. … More commonly, meteorologists measure PoP as the chance of rain at any given point in the area they cover during a certain period of time.

## What does 80 percent chance of rain mean?

An “80% chance of rain” means that there is an 80% chance that rain will fall somewhere within the forecasted area.

## What does 70% rain mean?

Basically, it means that a certain percentage of the forecast area is expected to get rain. … So, hold onto your umbrellas because after today we have a 70 percent chance of rain for Thursday and a 60 percent chance of rain for Friday.

## Will it rain if it’s 50 chance?

IT DOES NOT MEAN…

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. So what’s the forecast area and forecast period? … The forecast area can also be much smaller than a county.

## 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.”

## 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.

## How do you calculate the probability of rain?

Calculate the probability of precipitation. The official formula from the National Oceanic and Atmospheric Administration is: PoP = C x A, where C is the confidence percentage and A is the percentage of the area with precipitation.

## Is 30 chance of rain bad?

This percentage does NOT define the intensity of rain or if there will be any severe storms. So, even with a 30 percent chance of rain, you could still see flooding or a severe storm.

## What does 60 rain mean on weather app?

‘So 60 per cent means a 60 per cent chance of rain, 40 per cent chance of dry. There are different ways of expressing percentages and in the USA they do use the area one, but generally not here in the UK. ‘So if you’ve got the Met Office app, that’s one less thing to worry about; mind unblown.

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

You see it in almost every weather app and forecast nowadays – a percentage that tells you the chance it will rain for each day. … If there is a 50% chance of rain, some people think it means 50% of the area will receive rain.