The South Fork of the Snake River runs for more than 60 miles across southeastern Idaho. | EastIdahoNews.com file photo POCATELLO — After east Idaho’s warmest winter on record, regional weather experts say the forecast for the largest river system in the region is “bad news.” And the rest of the Pacific Northwest looks to be in either a similar, the same, or a worse situation. The National Oceanic and Atmospheric Administration held a webinar la…