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July Fry 2021

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It means that 50% of the viewing area is suppose to see rain … also means 50% will not
@SouthATLwx this is actually what the percentages mean .. look it up nothing weenie about it .. if they say 70% it means 70% of that viewing area is suppose to see rain and 30% won’t … just informing ??‍♂️
 
NWS Raleigh at 9:50p Monday 7/27/21:

"the threat for any severe weather or
flooding seems likely to be over. Some gusty winds will still be
possible with the remaining thunderstorms. A slight chance of
showers remains after midnight, but nothing organized is expected.”

Might be the biggest fail Ive seen from them in ..... days.
 
@SouthATLwx this is actually what the percentages mean .. look it up nothing weenie about it .. if they say 70% it means 70% of that viewing area is suppose to see rain and 30% won’t … just informing ??‍♂️

Here's the *PREFERRED* and *COMMON* meaning of PoP amongst actual meteorologists.


...A video went around that claimed that a 30% chance of rain doesn’t mean that there’s a… 30% chance that it might rain that day. Instead, it means there’s a 100% chance it will rain, but said precipitation will only cover 30% of a given area. Cue the pandemonium. Who would have assumed that was the correct interpretation? People felt lied to. But for every viewer expressing dismay, another expressed skepticism. How could we be sure this random TikToker had it right? (Spoiler: They didn’t.)

The TikToker — who didn't respond to Refinery29’s request for comment by press time — was incorrect
...I asked Castle Williams, PhD, a social science contractor supporting National Oceanic and Atmospheric Administration's Research's Weather Program Office, to explain PoP to me as though I was a precocious fourth grader...

...His preferred definition is this: “[PoP measures] the likelihood that you’ll see rain at any given point within the forecast area within a 12 hour time period,” he tells me. His interpretation is more in line with the common understanding of PoP — not the TikTok.

Mindy Beerends, Meteorologist-in-Charge at the National Weather Service Center Weather Service Unit in Indiana, has a more technical definition: “It’s the chance of precipitation, which we define as 100th of an inch of rain falling at a particular point over a certain period of time,” she says. Beerends’ explanation falls in line with the official NOAA definition of PoP, and both also seem to debunk the viral TikTok...
 

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No grass cutting for me for the 3rd day in a row. Rain keeps getting in my way
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@SouthATLwx this is actually what the percentages mean .. look it up nothing weenie about it .. if they say 70% it means 70% of that viewing area is suppose to see rain and 30% won’t … just informing ??‍♂️

No. 30% of chance of rain mean that there is a 30% chance that the forecast grid in question had 0.01" precipitation.


What does this "40 percent" mean? ...will it rain 40 percent of of the time? ...will it rain over 40 percent of the area?

The "Probability of Precipitation" (PoP) simply describes the probability that the forecast grid/point in question will receive at least 0.01" of rain. So, in this example, there is a 40 percent probability for at least 0.01" of rain at the specific forecast point of interest!

Also,

To summarize, the probability of precipitation is simply a statistical probability of 0.01" inch of more of precipitation at a given area in the given forecast area in the time period specified. Using a 40% probability of rain as an example, it does not mean (1) that 40% of the area will be covered by precipitation at given time in the given forecast area or (2) that you will be seeing precipitation 40% of the time in the given forecast area for the given forecast time period.

\Adding Source

 
Flash flood warning for south of bham. Rains going sideways at my work preventing me from working lol.
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