Bright white triangle off to the lower right of Jupiter

While walking down the dirt road 100 yards from my driveway in a southbound direction with my daughter and her friend, joking with me saying “Look! That’s the brightest star in the sky!” After I glanced up and told her it wasn’t a star, it was Jupiter, I looked back down at the road; seconds later, she says “LOOK DAD THAT’S SOOO WEIRD!” I looked, and what I saw was an upside down funnel shape; white hazy in color, (like a flashlight pointing down inside a hazy white Smokey shade that extended downward; no movement, no clouds, and no noise). Before fading into the sky, the bottom center of the cone seemed to change position from 6 o’clock to 4 o’clock, the top still anchored in the same position. My daughter saw a dark cloud above the shape, I didn’t notice it. I can’t estimate the distance with any accuracy but was very far off in my opinion.
The shape was a little lower and to the right; a couple finger widths of Jupiter in the Capricornus Constellation; Jupiter’s elevation is about 20 degrees approximately. You could see an aircraft heading east very far up in atmosphere with marker lights blinking barely visible, just after incident; by comparison the cone was huge.
 
Launch of Black Brant sounding rocket from Wallops Island at 7:37 PM EDT on this date.  PD