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Social media lit up like a Christmas tree around 5:30 this evening as thousands across North and Central Alabama saw an extremely bright fireball rolling through the southern sky. Then, loud explosive type “booms” were heard… mostly around Smith Lake and adjacent areas.
"Saw the rainbow, two of them....."
"Heard it the boom and felt the house shake in Curry. Walker County"
"I saw a short rainbow about 5. It was strait. My dad was like "that's weird,a rainbow but no rain,wth?" I told my dad to never question logic.. Lol."
"I saw a short, straight rainbow at 5:30"
"Thought something hit the house ,my dog started barking like crazy !"
"My 5 year old son said he saw something falling from the sky! I thought he was telling a story, apparently NOT!!!!!!!"
"Our kids seen it outside. Come in screaming scared and excited. We felt in inside shook the house. Smith Lake-Brushy Pond."
"In my backyard in Samantha!!"
"I did ... it was stupendous. It looked like it was a block away from me"
"That was something!!!!!!!!!BOOM!!!!!!!"
"Good Hope, Cullman County.....very loud explosion sound. We all ran to see what had hit nearby Heard it and felt it in Hanceville; I figured it was my "fun loving" neighbor blowing some dynamite."
"Heard it the boom and felt the house shake in Curry. Walker County"
This website displays fireball data in the form of images, movies, diagrams, and text files.
The waxing crescent moon sets before midnight on October 20, and that means a dark sky between midnight and dawn, or during the best viewing hours for the 2012 Orionid meteors. On a dark, moonless night, the Orionids exhibit a maximum of about 25 meteors per hour.
These fast-moving meteors occasionally leave persistent trains and bright fireballs. If you trace these meteors backward, they seem to come from the Club of the famous constellation Orion the Hunter. You might know Orion’s bright, ruddy star Betelgeuse. The radiant is north of Betelgeuse. The Orionids have a broad and irregular peak that isn’t easy to predict.
More meteors tend to fly after midnight, and the Orionids are typically at their best in the wee hours before dawn. The best viewing for the Orionids in 2012 will probably be before dawn on October 21. Try the days before and after that, too, sticking to the midnight-to-dawn hours..earthsky.org...
The Taurid meteors, sometimes called the "Halloween fireballs," show up each year between mid-October and mid-November, but Nov. 5 to 12 will likely be the best time to look for them this year, based on their peak of activity and the effect of moonlight on viewing conditions. Initially, on Nov. 5 the moon will be very bright in the gibbous phase, but it will diminish in brightness with each passing night. Before the moon rises — around 10:30 p.m. on Nov. 5, and about 55 minutes later on subsequent nights — some 10 to 15 meteors may appear per hour. They are often yellowish-orange and, as meteors go, appear to move rather slowly.www.space.com...
What causes rainbows?
Rainbows are caused by the splitting of white sunlight into its component colors by raindrops. Some of the light that falls on a water drop enters the drop. As it enters the drop, the color components of the sunlight are refracted (bent) by different amounts depending upon their wavelength (we perceive the different wavelengths as different colors.)
Then, the different colors reflect off the back of the inside of the drop, and when they pass through the front of the drop again, they are refracted once again.
A rainbow is always directly opposite the sun from the observer's perspective. This explains why rainbows are only seen when the sun is low in the sky, usually in the late afternoon (in which case the rainbow will be seen to the east of the observer), or early morning (in which case the rainbow will appear to the west of the observer).
If the observer could see the shadow of his head cast by the sun, it would be in the exact center of a circle where the rainbow forms the top portion of that circle.
A circumhorizontal arc or circumhorizon arc (CHA), also known as a fire rainbow
It occurs only when the sun is high in the sky, at least 58° above the horizon, and can only occur in the presences of cirrus clouds. It can thus not be observed at locations north of 55°N, except occasionally from mountains.