A massive swarm of migrating painted lady butterflies were seen on Denver area weather radar.
From: The Weather Channel
Radar detected migrating butterflies in Colorado on Tuesday.
Many more non-meteorological features can also be spotted on radar.
Meteorologists at the National Weather Service (NWS) in Boulder, Colorado, spotted something unusual Tuesday when checking Doppler radar on what was an otherwise calm weather day.
At first, the NWS meteorologists thought the radar echoes spreading from east to west across the Colorado Front Range, including the Denver metro area, were birds. Observing birds on radar is a fairly common occurrence, especially when they take flight early in the morning.
But after some additional investigation, the mystery of what the radar was sensing pointed to another culprit: migrating butterflies.
You can see the radar echoes in purple (left side) and blue (right side) advancing from right to left in the animation below (originally labeled as birds). The NWS estimated that the swath of butterflies was more than 70 miles wide, extending across all of Arapahoe County.
https://weather.com/science/news/radar- ... -migration
And I thought the monarch was our only migrating butterfly.
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