Storms along the Niobrara River in northeastern Nebraska early Wednesday brought the risk of flash floods, high winds and and tornadoes.A tornado warning was issued around 6:30 a.m. for the Sioux City area. Thunderstorms moving southeast carried winds of up to 80 m.p.h.The National Weather Service posted a Severe Thunderstorm Watch for northeast Nebraska and northwest Iowa until 10:00 a.m.Elsewhere, an Excessive Heat Warning will take hold Wednesday afternoon and remain in effect through Saturday evening. Air temperatures are expected to reach 100 degrees, with overnight lows falling only to around 80. Coupled with the high humidity, the temperature will feel like it is above 110 degrees. The prolonged heat can take a cumulative toll on the body, and residents without access to air conditioning should take precautions or seek shelter as the heat warning progresses. Officials also encourage you to check on elderly neighbors and pets.The Nebraska State Patrol recommends prepping a travel survival kit for the incoming heat.“When it gets this hot, it doesn’t take long for the heat to affect people,” said Colonel JohnBolduc, Superintendent of the Nebraska State Patrol. “We want people to remember that if they become stranded on the road, they can call the NSP Highway Helpline to reach NSP dispatchers and request help from a trooper.”NSP recommends that motorists keep a travel survival kit in their vehicle that can help in the event they become stranded. These items could include:Water – one gallon plus one bottle per personHigh-energy or dehydrated foodsPhone chargersSunscreen and protective clothingTool kitFlashlight with extra batteriesTow ropeFirst Aid kitAny motorist in need of assistance can reach the NSP Highway Helpline by dialing *55 from a cell phone or 1-800-525-5555 from any phone.