Wondering why your browser search and homepage gets redirected to the site search.stheweatherpilot.com? This is because you have been infected with a browser hijacker. When this happens, search results from search.stheweatherpilot.com will send you to malicious websites to get money from you or infect your computer further. It may also prevent you from changing your settings back.
Search.stheweatherpilot.com is usually installed bundled with The Weather Pilot extension without you knowing. Remove it immediately.