Those are the most ideal times for rainbows to form, because the sun is lower in the sky, allowing more rays to pass through rain drops at the tail end of a storm, Elliott said.

"It can happen any time of the year, but they're more common this time of year," Elliott said of rainbows.

Double rainbows, he said, are more common than most people think. They're just tougher to see, because they're not always as vivid as the ones that were spotted Thursday night in Morris and Bergen counties. 

"You need the sun behind you," Elliott said, which is why rain showers that move from west to east are ideal for producing any rainbows.

"The bow is always observed in the opposite side of the sky from the sun," the National Weather Service notes in its official definition of a rainbow.

The weather service says the arc of a rainbow displays all colors of the visible light spectrum, in this particular order: Red, orange, yellow, green, blue, indigo and violet. When a double rainbow forms, the second arc has those colors reversed.

"Double rainbows are really just a reflection of the first one," Elliott said.

Although no agency keeps statistics on how many rainbows form each year, the recent uptick in double rainbow sightings in New Jersey is likely the result of an active summer thunderstorm season coupled with the explosion of camera phones, Elliott said.

"I think that's more of a cultural phenomenon now," the meteorologist said. "Everyone's got cell phones in their pockets, and they can quickly post photos for everyone to see on Instagram."

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jcgirl253A lot of double rainbows 🌈🌈 this year.

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sorry, can not copy or save maotimages

Words often have a way

of inhibiting what we want to say

so this may not say what I want

and i hope it does not sound like a rant

the world is turning dumb

and many of us are felling numb

when will we start to see the light

and realize that things are not alright

we have turned our faces from God's light

and I am sure that we are a disgrace in His sight

we all need to repent and admit our error

if we truly wish to put an end to all this terror