With communities across Northern California expected to see rising temperatures, you may be tempted to take a dip in a local river, lake or stream. Resist that urge, experts say. Local waterways are seeing chilly, fast-flowing water due to spring snowmelt, according to the National Weather Service and other agencies. … “The melting snowpack is creating cold, higher flows,” Dave Gabbard, PG&E vice president of power generation, said in the release. “We encourage everyone recreating in or near water to be situationally aware and have a plan to quickly and safely escape in case of changing water flows and cold temperatures.”