"Last night, for example, it was showing some pretty high radar returns or echoes, and it was actually labeling them as large drops, raindrops", said NWS meteorologist Alex Boothe, The Las Vegas Review-Journal reported.
It's not the first time these flocks of flying insects have swarmed Sin City before.
Attracted to ultra-violet light, the insects have been clustering around the city's brightly lit tourist district, a concentration of resort hotels and casinos along The Strip.
When the grasshopper population gets big, that also triggers the insects to move to a new area, he said.
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The resort, a 30-story pyramid inspired by ancient Egypt, says that its Sky Beam, a powerful column of light issuing nightly from the peak of the pyramid, can be seen by airline pilots as far away as Los Angeles.
The grasshoppers are migrating through the Las Vegas Valley due to a wetter-than-normal winter, according to Jeff Knight, a state entomologist with the Nevada Department of Agriculture.
"They generally just eat weeds", Knight said. They should be gone in a few weeks, Knight said.
Nevada has seen more rain than usual this year. "It created a little bit of a panic epidemic because people didn't know what they were". The bugs aren't any danger to humans and they don't carry disease or bite. "They're not gonna sting you", he added.
While Knight said this year's migration was among the worst he'd seen, and acknowledged the bugs' affinity for bright lights made them a nuisance for some businesses, he stressed they were completely harmless, and expected they would move on within a fortnight.