If history proves correct, Magicicada Brood IIwill emerge this spring after living underground for 17 years.
In many places along the Eastern Seaboard — from North Carolina to Connecticut — the cicadas will fill the skies, breed and then quickly die. , this group, known as Brood II, has been so prolific that picking up their carcasses can sometimes feel like raking leaves in the fall.
Pinpointing just when they will emerge is tricky. But we do know that they generally begin to emerge when the ground temperature — 8 inches from the surface — reaches 64 degrees.
That's where you come in. , our friends at Radiolab want to track the once-in-a-generation phenomenon and have put together instructions on how you can build your own sensor and submit your temperature information. With temperatures rising, now's the time to get going.
We spoke to John Keefe, WNYC's senior editor for data news, who confirmed that with about $80 in parts from and two hours of work, you could make a temperature sensor that delivers information using nine LED lights. As the temperature changes, the combination of LED lights change. You then go to their site .

Once the sensor hits 64 degrees, you'll know what to expect and those in the south can warn those of us farther north of the impending #swarmageddon!
. John says if you're not that ambitious you can always just buy a soil thermometer ( ) that will detect temperatures 8 inches underground.
If you're in New York, however, there's better news: Radiolab is hosting two events where you can make your own cool, LED light sensor with the Radiolab folks.
The events are:
-- 7:30 p.m. Monday, April 8 at Brooklyn Brewery in Williamsburg with Jad Abumrad and the Data °µºÚ±¬ÁÏ Team. (21 years or older.)
-- 12 p.m., 1 p.m. and 2 p.m. Sunday, April 14 at the New York Hall of Science in Queens. (Ages 12 and over.)
Radiolab , explaining the project:
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