Flash Flood Warning for Cochise and Graham Counties, Arizona Through 5:45 PM MST September 3: Keep Your Vehicle Out of Flooded Roads

A Flash Flood Warning is currently in effect for Cochise and Graham counties in Arizona, issued by the National Weather Service Tucson, Arizona office. The warning became active at 2:53 PM MST on September 3, 2026, and runs through 5:45 PM MST on September 3, 2026. Flooding is occurring or is imminent across the affected area, meaning conditions are dangerous right now and are not a future possibility.

What NWS Tucson Is Telling Residents to Do Right Now

The National Weather Service is clear on the single most critical action for anyone in or near Cochise and Graham counties during this warning window: turn around, don’t drown when you encounter a flooded road. This is not a cautionary suggestion. The NWS states directly that most flood deaths occur in vehicles. A road that appears passable can be carrying far more water and force than it looks. No destination is worth the risk.

Beyond roads, the NWS warning specifically calls out people who are outdoors in natural settings. Campers and hikers must avoid streams and creeks for the duration of this warning. These waterways can rise with extraordinary speed during heavy rain events, even when the rain is falling miles away from your exact location. A dry or low creek bed can become a deadly torrent in minutes. If you are currently in a canyon, near a wash, or along any drainage in these counties, move to higher ground immediately and do not wait to see whether the water rises.

The NWS instruction also emphasizes that residents need to know where they are relative to streams, rivers, and creeks. This matters even for people indoors or in vehicles. If your route home, your campsite, or your current position is in a low-lying area near moving water, that knowledge should be driving your decisions right now, not after conditions worsen.

To summarize the official guidance from NWS Tucson for Cochise and Graham counties through 5:45 PM MST on September 3, 2026:

• Do not drive through flooded roads under any circumstances.
• If you are hiking or camping near streams or creeks, leave those areas now.
• Know your position relative to any waterway and act on that information before water levels change.

Putting This Warning in a Broader Preparedness Context

Flash flood events like this one in southern Arizona are a reminder that disaster preparedness is not only about the slow-moving risks that allow days of planning. Some of the most lethal weather events arrive and close within a window of hours. Cochise and Graham counties sit in terrain where desert washes and canyon drainages can funnel enormous volumes of water with little warning. For households and travelers in this region, a basic preparedness habit worth building year-round is knowing the elevation and drainage characteristics of places you frequent, whether that is a regular hiking trail, a county road you commute on, or a campground you return to seasonally. That local knowledge, combined with monitoring active NWS alerts before and during outdoor activities, is what converts a close call into a safe outcome. This warning expires at 5:45 PM MST on September 3, 2026, but conditions should be re-evaluated before traveling even after expiration, as roads and washes may remain hazardous after the official warning window closes.

Source: National Weather Service Tucson, AZ. Flash Flood Warning issued September 3, 2026, at 2:53 PM MST, effective through 5:45 PM MST. Areas covered: Cochise County, AZ and Graham County, AZ.

For the fundamentals that apply beyond this specific alert, see our Flood Preparedness guide.

Source: National Weather Service (NWS Tucson AZ). Active alert data retrieved 2026-09-03 22:01 UTC via api.weather.gov.