Study: Rainfall impacted by moon

As the moon rises, slight swelling in the atmosphere produces tiny changes in the amount of rainfall, according to research from the University of Washington.

Co-author Tsubasa Kohyama, said, "As far as I know, this is the first study to convincingly connect the tidal force of the moon with rainfall. When the moon is overhead or underfoot, the air pressure is higher."

The study, to be published in the journal Geophysical Research Letters, also suggests a modest dip in the amount of rain due to the moon's gravitational pull.

Click through images of the Supermoon lunar eclipse:

According to a summary of the findings, "When the moon is overhead, its gravity causes Earth's atmosphere to bulge toward it, so the pressure or weight of the atmosphere on that side of the planet goes up. Higher pressure increases the temperature of air parcels below. Since warmer air can hold more moisture, the same air parcels are now farther from their moisture capacity."

The research is based on 15 years of data compiled by NASA and the Japan Aerospace Exploration Agency's Tropical Rainfall Measuring Mission.

And, though the change is measurable, it's not really noticeable—ultimately accounting for only one percentof variation in rainfall.

Kohyama said, "No one should carry an umbrella just because the moon is rising."

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