ALERT Flood Detection

Tue, Aug 26, 2025: Heavy rain is forecast today over the @MHFloodDistrict with abundant moisture helping to produce efficient rainfall rates. #COflood threats include rises on waterways, road flooding & debris flows over steep terrain. Follow @NWSBoulder for the latest. #cowx

Wed, Jul 30, 2025: More heavy rain is expected over the @MHFloodDistrict this afternoon & evening. Rises on local waterways, road/low-lying area flooding, & debris flows over steep terrain will be possible. Follow @NWSBoulder for the latest warnings & advisories. #cowx #COflood

Tue, Jul 29, 2025: Despite AM cloud cover, plenty of moisture is expected to fuel scattered to widespread PM storms over mainly southern portions of the @MHFloodDistrict. Follow @NWSBoulder for the latest warnings & advisories. #cowx #coflood

Thu, Jul 24, 2025: Another High threat of heavy is expected this afternoon/evening for the @MHFloodDistrict. Highest threat will be southern/eastern areas. Flash flooding & debris flows will be possible. Follow @NWSBoulder for the latest warnings & advisories. #cowx #COflood

More heavy rainfall for the @MHFloodDistrict this evening (Wed, Jul 23rd). An ALERT gauge in Aurora picked up 1.62in/1-hour (4-10% annual chance). More impressive is the 15-minute rainfall rate of 1.15in (3% annual chance). #cowx #COflood

Heavy rain affected several parts of the @MHFloodDistrict yesterday (Tue, 7/22). The highest intensities were along I-25 from Lone Tree to Castle Rock. This ALERT gauge picked up 1.62in/2-hours (a 4-10% annual chance). Up to 2.5in/2-hr occurred nearby (1-2% annual chance). #cowx

Wed, Jul 23, 2025: Persistent upslope flow in a high moisture environment will return the threat for heavy #MHFDrain to the western @MHFloodDistrict. Flash flooding & debris flows will be possible. Please follow @NWSBoulder for the latest warnings & advisories. #cowx #COflood

Tue, Jul 22, 2025: Brief, but heavy #MHFDrain is expected over portions of the @MHFloodDistrict by early afternoon. Isolated flash flooding will be possible. Please follow @NWSBoulder for the latest warnings & advisories that are issued. #cowx #COflood

A second day in a row for heavy rainfall over the @MHFloodDistrict. This @mhfdfws ALERT gauge near Buckley picked up 1 inch of rain in 10 minutes! That's a 2% Annual Exceedance Probability. #cowx #coflood #mhfdrain

Heavy rainfall moved through the south Denver metro area earlier this afternoon. This @mhfdfws ALERT gauge just south of Parker received 1.13 inches in 15-minutes, which is a 2-4% Annual Exceedance Probability. Check out other max intensities from the storm below. #cowx #mhfdrain

Tue, Jun 24, 2025: Ample moisture & instability is expected to produce heavy #MHFDrain over the @MHFloodDistrict by early afternoon. Isolated flash flooding on creeks/streams/gulches/roads may occur. Please follow @NWSBoulder for warnings & advisories. #cowx #COflood

June 17, 2025: Ongoing heavy rain will increase in coverage and intensity over @MHFloodDistrict later today. Isolated flash flooding is possible. Follow @NWSBoulder for advisories and warnings. #COwx #COflood

June 5, 2025: Very active weather will continue for @MHFloodDistrict this afternoon and evening. Multiple rounds of heavy rainfall are possible, along with flash flooding. Follow @NWSBoulder for advisories and warnings. #COflood #COwx

June 2-3, 2025: Widespread, heavy #MHFDrain is forecast for the OVERNIGHT hours (2nd) & into tomorrow morning (3rd) over the @MHFloodDistrict. Enhanced runoff is expected, so the #COflood threat includes rises on creeks/streams/gulches. Follow @NWSBoulder for the latest. #cowx

Mon, May 26, 2025: Heavy #MHFDrain is forecast for #MemorialDay. The #COflood threat should be more isolated, favoring areas south & east. Increased runoff should be expected along with rises in local creeks/streams after yesterday's rain. Follow @NWSBoulder for the latest. #cowx

Sun, May 25, 2025: Another round of strong storms & heavy #MHFDrain will be possible later this afternoon over the @MHFloodDistrict. Increased runoff should be expected over impervious areas along with rises in local creeks/streams. Follow @NWSBoulder for the latest. #cowx

Tue, Aug 13, 2024: Heavy rainfall is expected for the Denver metro area this afternoon and evening. The highest threat will be east of I-25. Flash flooding will be possible in low lying areas and smaller creeks. Follow @NWSBoulder for warnings and advisories. #cowx #MHFDrain

Sunday, July 21, 2024: An earlier rainfall threat for the #MHFD today with another round of rain possible this evening. Increased runoff should be expected over areas experiencing heavy #MHFDrain as well other #COFlood threats (see below). Follow @NWSBoulder for the latest. #cowx

Friday, June 14, 2024: Plenty of moisture will fuel strong-to-severe storms this PM in the Denver metro. Rain rates up to 2.0 inches per hour warrant a High flood threat, mainly east of I-25 and north of I-70. Follow @NWSBoulder for the latest #cowx #coflood warnings. #MHFDrain

Impressive rainfall rates were well captured by gauges around the Denver metro area tonight. This @mhfdfws ALERT gauge got 2.52 inches in just over an hour. This is a 0.5-4% Annual Exceedance Probability, depending on the duration considered (see below). #cowx #mhfdrain