Related by context. Frequent words. (Click for all words.) 60 contrail 51 contrails 41 sonic boom 41 plume 40 fog 39 haze 38 clouds 38 billowing smoke 38 billows 37 streaked 37 billowing 37 fireball 37 blurry 36 whizzing 36 sky 36 mushroom cloud 36 arced 36 whoosh 36 zipping 36 streaking 35 whitish 35 orb 35 optical illusion 35 UFOs 34 UFO 34 plumes 34 mist 34 flying saucers 34 meteor 33 orange glow 33 smoky haze 33 puddle 33 grayish 33 hazy 33 lightning bolt 33 grainy 33 acrid smell 33 wafting 33 vaporized 33 gliding 33 billow 33 cloudy sky 33 unidentifiable 33 blobs 33 flaming 33 thick fog 33 sonic booms 32 funnel cloud 32 airborne 32 yellowish 32 skid marks 32 flecks 32 eerie 32 smell 32 droplets 32 wisps 32 flashes 32 partial eclipse 32 brownish 32 whiff 32 woozy 31 swirling 31 circling 31 thin layer 31 bluish 31 sighting 31 smudges 31 midair 31 wisp 31 spotted 31 winged 31 scent 31 greenish 31 UFO sightings 31 flew overhead 31 eerily 31 strobe light 31 swirl 31 glide 31 flickering 31 flit 31 spotting 31 blackness 31 vapor 31 slack jawed 31 overcast skies 31 exploding 31 emptiness 31 swirls 30 skies 30 fluttering 30 swarm 30 misty 30 disorientation 30 scooting 30 Space.com 30 blimp 30 drifting 30 waft 30 Smell 30 zigzagging