The cooler temperatures and rain will provide relief from recent warmer conditions, but residents in western Nebraska should prepare for potential heavy rain and storms on Sunday. Southeastern Nebraska may see moderate rainfall, which could lead to localized pooling of water in low-lying areas. The drop in temperatures, especially morning lows potentially reaching the 30s°F (-1°C to 4°C) near September 27-29, could signal the first frost for some areas, impacting sensitive plants and outdoor activities.