Flash flooding poses a significant risk in South Texas, particularly in low-water crossings and small creeks. Coastal areas near Corpus Christi and Rockport may experience minor flooding through early Tuesday. In California, high surf and rip currents create hazardous conditions along the coast, while the Pacific Northwest faces potential travel disruptions due to heavy rain and snow in the Cascades. High winds in Montana could impact high-profile vehicles and unsecured outdoor items.