Post by HarahanTim on May 19, 2013 10:10:50 GMT -6
A friend of mine shared this on Facebook, thought it was worth posting here. Though mentioning Dallas, the principle is the same wherever. Steve McCauley
Here is your CAP PRIMER to refresh (or introduce) the concept of The Cap. Basically it's a layer of warm air aloft that acts like a LID and prevents surface air bubbles from climbing very high into the atmosphere. And if you can't get these air bubbles to rise very high, you can't form towering thunderclouds.
Think of the air bubbles as individual hot air balloons. As long as the air inside the balloon is warmer than the surrounding environment, the balloon will rise. But if you try to fly the balloon into an area that is just as warm as it is, the balloon will no longer go up. It gets trapped in the cap.
Same thing happens with rising air bubbles. If ascending surface air bubbles encounter warm air aloft, they stop rising, and voila, you have prevented thunderstorm formation. But if you can get the surface air bubbles hot enough, then they may just have enough energy to punch through the cap and get to the very cold air on the other side. This leads to explosive thunderstorm development.
Of course, there is a way around this barrier. If you have some high-altitude moisture flowing ON TOP of the cap, you can indeed make storms that way. These storms do not have to "break through" anything. These are what we call "elevated" storms since they can develop on top of the cap, but that would be cheating.
coffeecups: Anyone here besides me and Sky?
Apr 27, 2017 8:34:33 GMT -6
coffeecups: I'm still lurking at the coming weather!
Apr 17, 2017 16:44:08 GMT -6
coffeecups: WOW! My patio was dry when I got home.
Apr 16, 2017 18:22:16 GMT -6
coffeecups: Came home to Harvey from Slidell. Had a little rain here and there. There was no rain in Slidell when I left at 3:30pm. While in NO EAST, I saw where it looked like it was storming around Covington going towards Slidell. Wet but no rain when I got home
Apr 16, 2017 18:21:07 GMT -6
coffeecups: I will eat some strawberries on my cruise in early May---just a few of course, as long as I stay away from my better half.
Apr 13, 2017 20:39:35 GMT -6
SKYSUMMIT: Yea, had a good bit of strawberries. Did NOT go to the fest though.
Apr 12, 2017 19:48:32 GMT -6
coffeecups: Sky, did you enjoy the strawberries?
Apr 12, 2017 18:43:30 GMT -6
SKYSUMMIT: yea, we're in a quiet lull right now
Apr 10, 2017 21:19:12 GMT -6
coffeecups: At least with the tropical forecast we have more to go on than fantasy.
Apr 9, 2017 18:00:26 GMT -6
coffeecups: Unfortunately for me, strawberries are a widower maker!
Apr 8, 2017 11:46:43 GMT -6
SKYSUMMIT: Man it's gonna be a nice weekend! If you're looking for something to do, head over to the Ponchatoula Strawberry Fest!
Apr 5, 2017 21:35:02 GMT -6
coffeecups: Are you getting like me?
Apr 5, 2017 11:08:26 GMT -6
wsmith0306: Can't believe I've never noticed this before. I must be getting old or blind. or both!
Apr 4, 2017 8:06:37 GMT -6
coffeecups: It felt cool this morning. Very nice weather!!!
Apr 4, 2017 7:13:20 GMT -6
coffeecups: Mary protected me again.
Apr 3, 2017 7:18:35 GMT -6