The National Weather Service issued flood watches for the Southwest, Intermountain West, and Midwest regions on Friday, September 18, as a period of heavy rain began moving across the country. Forecasters expect the rainfall to continue through the weekend and into the following week, potentially affecting residents in approximately two dozen states. The weather pattern is driven by an intensifying super El Niño, which has increased moisture in the atmosphere due to record-warm Pacific waters.
This storm system follows several fatal flooding events in the region. On Wednesday, September 16, three people, including a child, died after being swept away by floodwaters on the Navajo Nation. Previously, three individuals died during August flash floods at Grand Canyon National Park in Arizona, and flash floods in July required water rescues in Texas. Meteorologists noted that climate change and the current El Niño cycle are contributing to more frequent storms and elevated risks for severe weather.
On Friday, September 18, heavy rain was forecast for burn scars in Idaho and Montana, where scorched earth lacks the capacity to absorb water. The National Weather Service identified a "Slight Risk" of flash flooding for parts of Montana, the Dakotas, Minnesota, and Iowa. By Saturday, September 19, the threat is expected to shift east toward the Great Lakes, with downpours possible from Nebraska to Michigan. Additionally, the Boulder, Colorado, area is projected to see increased storm coverage and intensity on Saturday following scattered thunderstorms on Friday.
While the source did not provide a specific dollar amount for projected damages, the scale of the impact is reflected in the multi-state flood watches and the involvement of the National Weather Service across several regional offices. Residents will likely notice changes in their daily commutes and outdoor activities as the weather shifts from warm and dry to "unsettled" conditions. In cities like Boston, New York, Washington, D.C., and Raleigh, individuals may experience rain and thunderstorms through Monday, September 21, affecting local travel and public safety.
The knock-on effects of this moisture surge could influence future emergency management policies in wildfire-prone states like New Mexico and California, where flooding has worsened in recent years. As winter nears, forecasters expect these storms to become more frequent, particularly across the southern tier of states. Following the current storm, meteorologists are monitoring a separate system in western Mexico that may bring additional moisture to the Four Corners region next week. The National Weather Service in Wakefield, Virginia, indicated that rain chances will return for the Mid-Atlantic by late Sunday, September 20, or Monday, September 21.