The National Weather Service in Tucson issued a Flash Flood Warning on August 19 at 3:59 PM MST, effective until 7:00 PM MST for south central Pima County and southwestern Santa Cruz County in southeastern Arizona. The warning cites Doppler radar indicating thunderstorms producing heavy rain, with 1.5 to 2 inches already fallen. Flash flooding is ongoing or expected shortly, affecting small creeks, streams, urban areas, highways, streets, underpasses, and other low lying areas.
KEY FACTS
- The warning covers south central Pima County and southwestern Santa Cruz County, including Arivaca, Sasabe, Arivaca Lake, and Ruby.
- Route 286 between mile markers 1 and 15 is specifically mentioned as at risk for flash flooding.
- The National Weather Service reports that between 1.5 and 2 inches of rain have already fallen, with more expected.
- Flash flooding is ongoing or expected to begin shortly, impacting poor drainage and low lying areas.
- The warning is in effect until 7:00 PM MST on August 19.
CONTEXT
The warning was issued based on radar indicated rainfall, a standard method for detecting potential flash floods. The affected region includes rural communities and transportation corridors, where flooding can quickly isolate residents and disrupt travel. Arivaca and Sasabe are small border communities, and Arivaca Lake is a recreational area. The National Weather Service emphasizes that flash flooding can occur with little notice, especially in areas with steep terrain or inadequate drainage. Residents are advised to avoid driving through flooded roads and to monitor local alerts. This warning is part of a broader pattern of monsoon season thunderstorms that frequently affect the southwestern United States during August.
WHY IT MATTERS
Flash flooding poses immediate risks to life and property, particularly in rural areas where emergency response may be slower. The warning highlights specific vulnerable locations, including a major highway, which could affect commuters and emergency services. Understanding the scope and duration of the warning helps residents and travelers make informed decisions to stay safe.
WHAT TO WATCH
- Monitor local weather updates for potential extensions or additional warnings as the storm system moves.
- Check road conditions on Route 286 and other affected routes before traveling.
- Be alert for rising water in creeks, streams, and low lying areas, especially near Arivaca Lake.
- Follow guidance from local emergency management officials regarding evacuation or shelter in place orders.