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Last blue moon of the decade to rise Saturday night

Of Brian Lada, AccuWeather meteorologist and staff writer
May 16, 2019, 9:55:15 EDT

An unusual full moon fills the sky on Saturday night – a type of moon that will not rise again until 2021.

Many people are familiar with the term "blue moon" and know it as the second full moon in a calendar month. However, there is another way for a full moon to serve this well-known nickname.

blue moon ap

An American Airlines passenger plane from Miami crosses a blue moon over Whittier, California, which it leads to Los Angeles airport, Friday, July 31, 2015. (AP Photo / Nick Ut)

"A season-winter, spring, fall, summer-usually has three full moons. If a season has four full moons, then the third full moon in the season can be called a Blue Moon," the old farmer's almanac explained on his site.

This weekend's full moon will be the third of four in spring, making it a blue moon. The first full moon in the spring fell on March 20, 2019 at 9.43. EDT, less than four hours after official spring start.

Seasonal blue moons are not very rare, occurring once every two or three years. The next seasonal blue moon falls on August 22, 2021.


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Many people in the US who go out on Saturday night can watch out to see a cloudy sky rather than the blue moon.

A powerful system in the central United States spreads clouds over most of the region, extending from the Gulf Coast to the Great Lakes and west to the Rocky Mountains.

Meanwhile, a storm season that stretches from the Pacific Ocean to spreading clouds over most of the Western United States

The best viewing conditions may end up across the eastern US, but clouds and mock showers may still interfere with viewing in parts of the midland and Deep South.

blue water forecast can be 2019

The weekend's full moon can be called some other nicknames in addition to a blue moon.

"The full moon of the month marked a time for increased fertility, with temperatures warm enough to safely carry young, a close end of late frosts and plants in bloom," the old farmer's almanac reported.

The fair's full moon is therefore known as Hare Moon, Flower Moon, Milk Moon and The Budding Moon.

Despite their nicknames, Saturday night will look like other full moon throughout the year.

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