Overview
- National Weather Service and local forecasters say a sequence of storm systems will push moisture into Arizona starting Friday, creating a multi‑day rain window for the Phoenix area.
- Early local forecasts show parts of the Phoenix Valley could pick up more than an inch of rain between Friday and Sunday, which would raise the risk of localized flash flooding and travel impacts.
- Remnants of Tropical Storm Vance and a strong El Niño pattern are cited as the main moisture sources that the trough will tap to fuel showers and scattered thunderstorms across central and southern Arizona.
- Heavy rain earlier this week produced flooding, evacuations and water rescues in the Four‑Corners region and the National Weather Service confirmed a tornado struck Heber‑Overgaard, prompting calls for state emergency declarations.
- Forecast confidence is limited on exact timing and totals, so residents should monitor updates, prepare for flood safety measures, and note that much of the eastern U.S. is still forecast to remain warm and dry for Halloween.