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How likely is a 50% chance of rain?

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.

cbsnews.com - When I See A 50% Chance Of Rain In The Forecast, What Does That ...

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DENVER (CBS4) - If you ask three people what a 50 percent chance of rain means you'll potentially get three different answers. The chance for rain (or snow) is probably the most misunderstood part of the weather forecast. In meteorology we refer to the chance for rain or snow as POPS, or probability of precipitation. Let's say tonight's forecast calls for a 50 percent chance of rain. IT DOES NOT MEAN...

1. that 50 percent of the area will get wet

2. or that it will rain 50 percent of the time

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?

FORECAST AREA - you may sometimes hear this called a forecast zone, and it's often a county or a metro area, but it can be larger if the entire region has a similar climate. The forecast area can also be much smaller than a county. We see this a lot in states like Colorado due to the terrain. One county can have multiple forecast zones that are defined by elevation or the terrain. When it comes to television, the meteorologist is sometimes referring to his or her viewing area as the forecast zone. But this isn't true in a state like Colorado. For a meteorologist at a television station in Denver the POPS can sometimes vary widely, even within the metro area, due to local microclimates caused by the terrain. FORECAST PERIOD - this is usually something like today or tonight, but it can be more specific, such as this afternoon.

(credit: CBS)

Unfortunately, POPS is a very subjective topic. Let's say your county is the forecast zone and it has a 50 percent chance for rain today. If it rains in just one spot sometime during the afternoon then the forecast verified, regardless of where the rain fell within the county. The above scenario happens a lot. It might rain in a rural or unpopulated part of the county, missing the bulk of the population. Because the main population center missed out, most will think "they were wrong again," referring to the local meteorologists, despite the forecast really verifying, because it did indeed rain within the forecast area during the forecast period.

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What causes IQ to drop?

The cause of the IQ decline is due to environmental factors, and not genetics, said Ole Rogeburg, a senior research fellow at Ragnar Frisch Centre and co-author of the study on IQ scores, published in the Proceedings of the National Academy of Sciences journal.

time.com - IQ Scores Are Falling Due to Environmental Factors, Study Finds

IQ scores are on a decline, reversing a trend that saw scores rising at a steady rate during the 20th century, according to a new study. Researchers from the Ragnar Frisch Centre for Economic Research in Norway studied the IQ scores of about 730,000 Norwegian men born between 1962 and 1991. They found that scores grew by nearly three percentage points every decade for people born between 1962 and 1975. But among those born after 1975, scores fell. The cause of the IQ decline is due to environmental factors, and not genetics, said Ole Rogeburg, a senior research fellow at Ragnar Frisch Centre and co-author of the study on IQ scores, published in the Proceedings of the National Academy of Sciences journal. “It’s not that dumb people are having more kids than smart people, to put it crudely,” Rogeburg told CNN. “It’s something to do with the environment, because we’re seeing the same differences within families.” Environmental factors include differences in the way young people are educated, increases in time spent online, changes in nutrition and less reading overall. The downward trend is a reversal of the Flynn effect, a term that describes the vast improvement of IQ scores in many parts of the world throughout the 20th century. According to the study, the Flynn effect peaked in the mid-1970s and has declined in the decades since.

Write to Mahita Gajanan at mahita.gajanan@time.com.

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