Deep, monsoonal flow continued from earlier in the month. Some minor flooding occurred near Dulzura in San Diego County. Flash flooding occurred in Apple Valley and Victorville (one high water rescue, damage to property and school and multiple road closures), mud and debris on roadways in Alpine, and more flash flooding in Mill Creek at Forest Falls. The Victorville area was hardest hit during these two days.

Debris Flow in SAN BERNARDINO, CALIFORNIA
From 17-AUG-12 14:15:00 to 17-AUG-12 14:45:00 (PST-8)
Location: HESPERIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter SBD625 reported debris flows through canyons near Hesperia about one foot deep and 10 feet wide.

Thunderstorm Wind in RIVERSIDE, CALIFORNIA
From 16-AUG-12 12:30:00 to 16-AUG-12 13:00:00 (PST-8)
Location: SAGE
Magnitude: 52.00 EG
Property damage: 2000.00K
Crop damage: 0.00K
Reported by: NWS Employee

Rob Balfour reported strong winds at the Buck Fire base camp at Diamond Lake, with estimated max gusts of 60 mph. The winds destroyed two large tents, several camping tents and some awnings. A few port-a-potties overturned as well.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 17-AUG-12 12:30:00 to 17-AUG-12 13:30:00 (PST-8)
Location: FOREST FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several mudslides were reported in the Forest Falls area, the first of which was reported at Valley of the Falls Drive and Lilac Road with mud over the roadway. Numerous side streets are also covered in mud, with up to 5 feet of mud and debris in Mill Creek. No rescues or injuries but people are stuck in their cars and houses because of mud in the roads. The Yucaipa Ridge rain gauge (owned San Bernardino County Flood Control and just south of Forest Falls) reported massive rainfall of 5.36 inches in 1 hour and 45 minutes, between 1200 and 1347 PST. A short time later, the Mill Creek tributary, Rattlesnake Creek, was reported at bank-full. A spotter sent in a video of the water and debris flow in the normally dry creek, which was up to the bridge at one time.

Flood in SAN DIEGO, CALIFORNIA
From 17-AUG-12 14:15:00 to 17-AUG-12 14:45:00 (PST-8)
Location: ALPINE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter SDG437 reported mud and debris on the road at Japatul Valley and Lyons Roads as a result of a stationary and heavy thunderstorm over the area.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 17-AUG-12 15:00:00 to 17-AUG-12 16:45:00 (PST-8)
Location: THORN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter 625 reported 6 to 8 inches of water on the roadway near Bear Valley and Amethyst with the roadway completely covered with debris and water. There was also water flowing rapidly across the roadway approximately 1 to 2 feet deep, not allowing cars to pass. The same spotter also reported that the roadway at Corwin and Waalew Roads was covered with debris but still passable. The debris consisted of mostly dirt and rocks with an estimated 5 inches of water flow. A driver was stuck in widespread urban flooding at Topaz and Luna Roads in Victorville. Water was flowing very strong along Arrowhead Road at the Victorville Golf Course, resulting in a water rescue. Another spotter reported 2 to 4 inches of water over the intersection of Highway 395 and Highway 18, containing a lot of debris and stranding a few cars.

Flash Flood in SAN DIEGO, CALIFORNIA
From 16-AUG-12 11:30:00 to 16-AUG-12 12:30:00 (PST-8)
Location: DULZURA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

CHP is reporting a mud, dirt and rock slide along Deerhorn Valley Road. They also reported that heavy rain was causing flooding near Otay Lakes Road and that the bridge near the fire station was about to be washed out. No word was received if it actually did wash out.