NWS Grand Junction COFF.W 0124September 18, 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 7:15 p.m. local time on September 18. It was the 124th 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 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
- 4:13 p.m. MDT, September 18, 2026
- Expires
- 7:15 p.m. MDT, September 18, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KGJT FF.W 0124
- 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 715 PM MDT. * At 413 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.4 and 0.8 inches of rain have fallen. The expected rainfall rate is 1.5 to 3 inches in 1 hour. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Loma and Mack. This includes portions of I-70 between mile markers 8 and 15.
What the agency told people to do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Remain alert for flooding even in locations not receiving rain. Arroyos, streams, and rivers can become raging currents in a matter of minutes, even from distant rainfall. Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become life threatening in heavy rains. Campers and hikers should avoid streams or creeks. 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