Southwestern US Faces Flood Threats from Tropical Storm Priscilla

As of October 10, 2025, the southwestern United States is bracing for significant flood threats due to heavy rainfall from Tropical Storm Priscilla and an approaching storm system. Priscilla, which was previously a Category 2 hurricane, is anticipated to deliver 2 to 4 inches of rain to typically arid regions, including Arizona, Southern California, Nevada, Utah, and Colorado. Flood watches are currently active across much of Arizona, encompassing major cities such as Phoenix and Flagstaff.

The National Weather Service has indicated that deep tropical moisture is surging into the Southwest, likely causing widespread showers, thunderstorms, and potential flash flooding through the weekend. Additionally, moisture from Tropical Storm Raymond is predicted to reach southeastern Arizona by Saturday.

In northern Arizona, particularly around Flagstaff, up to 3 inches of rain are expected. The desert terrain, especially in areas with limited drainage infrastructure and wildfire scars, is highly susceptible to flash flooding. Forecasters warn that even upstream storms can create dangerous conditions suddenly, particularly in canyons and arroyos. Precautions are being taken across the region, including the deployment of heavy equipment, availability of sandbags, and water management actions. Tourists and residents are advised to be vigilant and avoid flooded areas, while emergency services remain alert during this potentially dangerous weather event.

These increasingly intense rain events are associated with a more active weather pattern and are consistent with climate change-related trends toward heavier precipitation and elevated flood risks, as supported by multiple studies.

For current weather conditions and forecasts in the affected areas, please refer to the provided weather information.

Weather for Phoenix, AZ:

Current Conditions: Mostly cloudy, 74°F (23°C)

Daily Forecast: * Friday, October 10: Low: 73°F (23°C), High: 93°F (34°C), Description: A thick cloud cover with a couple of showers and a heavy thunderstorm; watch for flash flooding * Saturday, October 11: Low: 71°F (22°C), High: 90°F (32°C), Description: Considerable cloudiness with a couple of showers and a heavy thunderstorm; watch for flash flooding * Sunday, October 12: Low: 71°F (22°C), High: 87°F (30°C), Description: Times of clouds and sun with a thunderstorm in parts of the area * Monday, October 13: Low: 69°F (20°C), High: 90°F (32°C), Description: Variable cloudiness with a thunderstorm in parts of the area * Tuesday, October 14: Low: 65°F (18°C), High: 88°F (31°C), Description: Mostly sunny * Wednesday, October 15: Low: 64°F (18°C), High: 82°F (28°C), Description: Pleasant with plenty of sunshine * Thursday, October 16: Low: 65°F (18°C), High: 85°F (29°C), Description: Plenty of sunshine

Weather for Flagstaff, AZ:

Current Conditions: Light rain, 54°F (12°C)

Daily Forecast: * Friday, October 10: Low: 52°F (11°C), High: 63°F (17°C), Description: Cloudy and cooler with a couple of showers and a heavy thunderstorm; persistent downpours may lead to significant flooding * Saturday, October 11: Low: 49°F (10°C), High: 62°F (17°C), Description: Cloudy and breezy with a couple of showers and a heavy thunderstorm; watch for flash flooding * Sunday, October 12: Low: 46°F (8°C), High: 67°F (19°C), Description: Mostly sunny * Monday, October 13: Low: 46°F (8°C), High: 62°F (16°C), Description: Variable cloudiness with a couple of showers and a thunderstorm; windy * Tuesday, October 14: Low: 43°F (6°C), High: 60°F (16°C), Description: Partly sunny, windy and cool * Wednesday, October 15: Low: 37°F (3°C), High: 61°F (16°C), Description: Plenty of sunshine, but cool * Thursday, October 16: Low: 38°F (3°C), High: 60°F (15°C), Description: Plenty of sunshine

Residents and visitors in the affected areas are urged to stay informed through official channels and adhere to safety advisories issued by local authorities.