I DO NOT OWN ANY OF THE MODS. This is the Weather mod, along with Forge ModLoader and Forge 1.4.2.
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (Weather & Tornadoes 1.4.2) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Weather & Tornadoes 1.4.2 from the list on the left. The launcher will handle everything else!