NWS Grand Junction COFF.W 0118September 15, 2026
Flash Flood Warning: Mesa, CO
The National Weather Service office in Grand Junction issued a flash flood warning for Mesa in Colorado, which was in force until 9:30 p.m. local time on September 15. It was the 118th flash flood warning the NWS office in Grand Junction issued in 2026. Colorado had 31 flash flood warnings in September 2026, against 8 in an average September of 2008-2025 (Colorado's flash flood warnings by year).
ExpiredWarning
In force for 3.1 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Grand Junction CO
- Area
- Mesa
- State
- Colorado
- Level
- Warning
- Issued
- 6:25 p.m. MDT, September 15, 2026
- Expires
- 9:30 p.m. MDT, September 15, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KGJT FF.W 0118
- Official source
- National Weather Service: the notice at its source
Flash Flood Warnings in Colorado since 2008Every warning type in Colorado
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
FFWGJT The National Weather Service in Grand Junction has issued a * Flash Flood Warning for... Northwestern Mesa County in west central Colorado... * Until 930 PM MDT. * At 625 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 1 inch of rain has fallen. The expected rainfall rate is 1 to 3 inches in 1 hour. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Mainly rural areas of Northwestern Mesa County, including I-70 between mile marker 5 and mile marker 10.
What the agency told people to do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.
The record around this notice
- Flash Flood Warnings in Colorado since 2008116 a year
- Every warning type in Colorado
- Flash Flood Warning: what it means, and the states that get the most3,924 a year
- NWS notices, September 20262,824 in the month
- The latest from the National Weather Service
- Warning, watch or advisory: the three NWS levels