As Catherine, Duchess of Cambridge, gave birth to a baby boy at St. Mary's Hospital in London, we have to ask: is it possible a change in barometric pressure helped induce her labor?
People have latched on to many long-held, weather-related wives' tales over the years. If cows are lying down in a pasture, rain is on the way. If a groundhog sees his shadow on Feb. 2, six more weeks of winter are in store.
And, of course, if barometric pressure changes, labor may be induced in pregnant British royalty.
Okay, we added that last bit, but studies do support that changes in pressure can induce labor.
According to the U.S. National Library of Medicine and the National Institutes of Health, "In the field of obstetrics and gynecology, several events have been empirically shown to be related to the weather."
In a study conducted by the Department of Obstetrics and Gynecology at the Tokyo Medical University, results showed that on days with a larger change in barometric pressure, regardless of whether it was increasing or decreasing, the number of deliveries increased.
"There is no question in my mind that when there is certain combinations of pressure changes, or a full moon, or storms, or snow -- I think it's mostly change in barometric pressure -- my patients go into labor," Jacqueline Worth, MD at Village Obstetrics in New York City, said.
"We absolutely have observed huge variations with weather."
Though Worth has not seen it supported in literature, she is certain it happens, noting the similar associations that have been made with migraines, heart attacks and other physiological conditions.
"The pressure in London has fallen by about 4 mb from yesterday to today," AccuWeather.com Meteorologist Eric Leister said. " It's a notable drop, but a small one. The pressure is capable of dropping much more than that in 24 hours, of even just a couple of hours," he said.
As the moon neared its full stage over the weekend, Worth took notice. Three babies were delivered at her practice over the weekend.
"It doesn't matter which direction [the pressure] changes in," Worth said. "All I know is that when those things happen I pack my bags and get ready to work."
Coincidence or not, as Catherine and the world welcome the royal family's newest edition, a baby boy, according to the Associated Press, the night of July 22 will usher in a full moon.
The midwestern United States will be in the crosshairs of potent thunderstorms into Saturday night.
Much of the eastern United States will continue to swelter with above-average temperatures into the end of the month.
Tropical Storm Darby, located over the Central Pacific, is expected to bring locally heavy rain and high surf to the islands this weekend.
Those looking for a break from the heat across the central United States will be in luck as a slow cooldown is in store starting this weekend.
The more than 100,000 people expected to attend the annual Glorious Goodwood festival next week will want to keep a brolly handy.
While a vast amount of dry air has dominated and will continue to impact the Atlantic basin over the next few weeks, tropical activity could spark near the west coast of Africa.
Minneapolis, MN (1987)
10 inches of rain fell in 6.5 hours.
Montpelier, ID (1990)
75 mph winds gust; tree damage.
Seattle, WA (1991)
99 degrees, all-time record high for July.