It's a high pressure system moving east from the west. It's called good management execution, and fundamental results.
A low, originally generated near the East Coast, but which has been moving steadily west, is on a collision course with the high. It's called shorty.
Hot stifling humid air is fueling the process and pushing the two fronts ever closer together. It's called lack of liquidity.
Combine them all together and you've got the makin's for a perfect storm.
If you've got enough shares to hold you down in a high wind throw em in a trunk and get a good hold of the trunk. If the trunk is light, I'd fill it now rather than trying to do it in a high wind. Once filled - get a good hold on it - it'll keep you anchored.