Anomalously strong northwesterly flow, monsoonal moisture, and low level southeasterly flow initiated afternoon thunderstorms over the mountains. A supercell developed over Park County in the early afternoon, developing southeasterly over Teller and El Paso County. High rainfall rates and saturated soils caused flooding, flash flooding, and debris flow along the highway 24 corridor in between Woodland Park and Colorado Springs. The same supercell was responsible for flooding south of Colorado Springs, as well.

Flash Flood in EL PASO, COLORADO
From 23-JUL-18 17:16:00 to 23-JUL-18 17:30:00 (MST-7)
Location: FOUNTAIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain from a supercell thunderstorm stalled a vehicle at the underpass of exit 125 and I-25.

Flood in EL PASO, COLORADO
From 23-JUL-18 15:25:00 to 23-JUL-18 16:00:00 (MST-7)
Location: GREEN MTN FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain from a supercell thunderstorm caused flooding of Fountain Creek near Green Mountain Falls. Reports indicated that the creek was out of its banks.

Flood in EL PASO, COLORADO
From 23-JUL-18 15:52:00 to 23-JUL-18 18:00:00 (MST-7)
Location: MANITOU SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain from a supercell thunderstorm closed highway 24 from mile marker 288 through 297 due to flooding and mud flows.

Flood in EL PASO, COLORADO
From 23-JUL-18 16:08:00 to 23-JUL-18 17:00:00 (MST-7)
Location: FOUNTAIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain from a supercell thunderstorm made S. Marksheffel Road, which is located northeast of Fountain, Colorado, not passable, according to a trained weather spotter.

Flood in EL PASO, COLORADO
From 23-JUL-18 16:30:00 to 23-JUL-18 17:30:00 (MST-7)
Location: COLORADO SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Heavy rain from a supercell thunderstorm covered southbound I-25 near downtown Colorado Springs with 2 feet of water, according to a HAM Radio operator.

Heavy Rain in EL PASO, COLORADO
From 23-JUL-18 15:27:00 to 23-JUL-18 15:47:00 (MST-7)
Location: COLORADO SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was 1.8 inches of rain was observed by a trained weather spotter in 20 minutes.

Heavy Rain in EL PASO, COLORADO
From 23-JUL-18 16:25:00 to 23-JUL-18 16:55:00 (MST-7)
Location: COLORADO SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was 1.44 inches of rain that fell.

Heavy Rain in EL PASO, COLORADO
From 23-JUL-18 17:00:00 to 23-JUL-18 17:22:00 (MST-7)
Location: COLORADO SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

There was 2.75 inches of rain that fell, which was measured, but the location was approximate.

Heavy Rain in EL PASO, COLORADO
From 23-JUL-18 19:50:00 to 23-JUL-18 20:19:00 (MST-7)
Location: FOUNTAIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was 3.25 inches of rain that fell located at this location, small, pea sized hail, was also observed. Damage to vegetation.