When flows of upper-air winds converge, they force air down, creating large areas of high pressure at the surface. When a river of upper air wind spreads out, it encourages air to rise from the ground, which creates a large area of low pressure at the surface.
What ever tab you are on, just open the Chrome Dev Tools by pressing F12. Once the chrome dev tools are open, just right click on the refresh button and a menu will drop down. This menu gives you the option of doing a hard refresh, or even clearing the cache and do a hard refresh automatically. It is a very small tip but is really useful in maintaining the workflow or reducing the number of steps to do the cache clearing task.
Two things you can do. You can save an IMAGE of your 8.1 to a thumb drive (not a DVD as it uses about 16GB) and you can create a custom Refresh file so that if you REFRESH Windows it will keep 8.1. How to create a Custom refresh image. How to create a System Image on a USB drive.owever, in this case, as you do not have a Windows 8.1 installation media, you can use Windows 8 product key and create a installation DVD or an USB flash drive. Refer to this article: http://windows.microsoft.com/en-GB/windows-8/create-reset-refresh-media.