2015: Moisture from Hurricane Dolores, along with monsoon moisture resulted in showers and thunderstorms over most of Southern California on 7/18 and this day.
Rainfall ranged from 0.5" to 4", including a record 1.7" at San Diego on 7/18.
This was unprecedented July rainfall: record single-day and July monthly total.
These two days recorded two of the three wettest July days on the San Diego record.
The San Diego River at Fashion Valley had two crests above monitor stage, 7.7 feet on 7/18 a nd 8.8 feet on this day.
A debris flow hit the burn scar of Silverado Canyon on this day as well as flash floods in Moreno Valley, Perris, and La Mesa.
Aided by lingering tropical moisture from former hurricane Dolores, intense
thunderstorms with torrential rain developed near Desert Center.
Over 6" of rain fell over several hours along and just to the south of Interstate 10, just to the west of Desert Center.
Eastbound lanes of Interstate 10 collapsed where they crossed a heavily flowing wash.
A vehicle drove into the hole in the collapsed bridge, trapping the driver and requiring rescue.
I-10 was closed in both directions causing huge traffic backups.
1985: Strong thunderstorms produced very heavy rainfall in the mountains and the adjacent desert.
A mudslide at the top of the Palm Springs Tram trapped 150, all but 31 were rescued by helicopter.
The 31 spent the night because the helicopter was grounded due to unsafe winds.
The 15 minute slide was a debris flow carrying huge rocks and timbers.
A thunderstorm plunged a light aircraft to the ground at Mormon Rocks, killing a family of 3.
Flooding was reported "all over" in the Morongo Basin.
A tornado in Needles hit a mobile home park and injured 6.
It leveled 4 mobile homes and damaged 14 others.
1.50" of rain fell in Palomar Mountain, the greatest daily amount on record for July.
2.36" fell in Cuyamaca, flooding Paso Picacho Campground.
1974: A severe thunderstorm with winds up to 80 mph and heavy rain swept through Lake Havasu City, AZ, and completely washed out section 4-5 feet deep in some streets.
Many cars were abandoned during the storm and a number washed away.
3 people were killed and 1 person was injured when their vehicle was carried down a wash by a wall of water estimated to be 10 feet tall.
1970: Mount Hamilton (East Bay) had a high temperature of 92° F.
1960: The overnight low in Death Valley was 102° F.
1960: Thunderstorm winds in the Tehachapis downed utility lines and damaged farm buildings.
1955: Heavy thunderstorms struck desert areas of Twentynine Palms and Barstow.
One cloudburst hit Cherry Valley with 3" of rain in 30 minutes.
A 75 foot stream of water crossed Highway 66 at Hodge, southwest of Barstow.
Washouts were also reported around Twentynine Palms.
1954: A northward moving hurricane made landfall in central Baja California with the remnants moving into Arizona.
Rainfall of up to 2" occurred in the mountains and deserts starting on 7.17 and ending on this day.
This occurred during the El Niño of 1953-54.
1931: Carson City, NV, had a high temperature of 107° F, while Reno, NV, recorded a high of 105° F.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, Phoenix, & San Diego
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Rainfall ranged from 0.5" to 4", including a record 1.7" at San Diego on 7/18.
This was unprecedented July rainfall: record single-day and July monthly total.
These two days recorded two of the three wettest July days on the San Diego record.
The San Diego River at Fashion Valley had two crests above monitor stage, 7.7 feet on 7/18 a nd 8.8 feet on this day.
A debris flow hit the burn scar of Silverado Canyon on this day as well as flash floods in Moreno Valley, Perris, and La Mesa.
Aided by lingering tropical moisture from former hurricane Dolores, intense
thunderstorms with torrential rain developed near Desert Center.
Over 6" of rain fell over several hours along and just to the south of Interstate 10, just to the west of Desert Center.
Eastbound lanes of Interstate 10 collapsed where they crossed a heavily flowing wash.
A vehicle drove into the hole in the collapsed bridge, trapping the driver and requiring rescue.
I-10 was closed in both directions causing huge traffic backups.
Two landspout tornadoes were observed in open desert just north of Landers on this day.
2013: On the evening of July 19th, a thunderstorm developed near Nellis Air Force Base along an outflow boundary and moved south across the Las Vegas Valley.
This storm was one of the most intense ever to cross the valley with respect to wind. Nellis Air Force Base measured sustained winds of 59 mph with a gust to 71 mph.
Sustained tropical storm force winds were recorded across the heart of the Las Vegas Valley with this storm.
Damages were greatest in the areas in and around Nellis Air Force Base and in Chinatown.
One apartment building was evacuated after a gas line broke.
At least 12 buildings throughout Las Vegas had wind damage.
Power was knocked out to casinos on Fremont Street and parts of The Strip. In addition, heavy rains caused up to two feet of water to flow across parts of The Strip.
Water damage also occurred at 3 strip casinos from the rain, including a portion of the casino floor at Caesars Palace.
Some 33,000 NV Energy customers lost power from this storm.
A total of 243 trees were downed at the Desert Pines Golf Course.
Damages were estimated at 2.5 million from this storm, with most of the damage from wind.
2009: Severe thunderstorm winds struck La Quinta foothills with gusts measuring 61 mph.
2005: The low temperature on this date was 95° F which set the warmest low ever recorded in Las Vegas.
The high temperature of 117° F on this date tied the hottest temperature ever recorded in Las Vegas.
The average temperature for the date was 106° F, which was the hottest day ever recorded in Las Vegas.
The morning low was 95° F and the afternoon high was 117° F.
2003: Flash flooding was observed in and around the town of Pahrump, NV (near Death Valley).
Water was running over SR 160 from SR 372 to Dandelion.
In the town of Pahrump, roads looked like rivers with a dumpster floating in the road blocking traffic. Mud was going through the Post Office and a trailer park. Basin Ave. and State Route 160 were under one foot of water.
Flooding extended half mile on Basin Ave. toward the west.
A gas station, the city park, and a shopping center parking lot were completely flooded.
1987: A rare cold air mass for mid-summer descended on the region starting on 7.18 and ending on 7.21 and broke numerous low temperature records.
1985: Strong thunderstorms produced very heavy rainfall in the mountains and the adjacent desert.
A mudslide at the top of the Palm Springs Tram trapped 150, all but 31 were rescued by helicopter.
The 31 spent the night because the helicopter was grounded due to unsafe winds.
The 15 minute slide was a debris flow carrying huge rocks and timbers.
A thunderstorm plunged a light aircraft to the ground at Mormon Rocks, killing a family of 3.
Flooding was reported "all over" in the Morongo Basin.
A tornado in Needles hit a mobile home park and injured 6.
It leveled 4 mobile homes and damaged 14 others.
1.50" of rain fell in Palomar Mountain, the greatest daily amount on record for July.
2.36" fell in Cuyamaca, flooding Paso Picacho Campground.
1974: A severe thunderstorm with winds up to 80 mph and heavy rain swept through Lake Havasu City, AZ, and completely washed out section 4-5 feet deep in some streets.
Many cars were abandoned during the storm and a number washed away.
3 people were killed and 1 person was injured when their vehicle was carried down a wash by a wall of water estimated to be 10 feet tall.
1970: Mount Hamilton (East Bay) had a high temperature of 92° F.
1960: The overnight low in Death Valley was 102° F.
1960: Thunderstorm winds in the Tehachapis downed utility lines and damaged farm buildings.
1955: Heavy thunderstorms struck desert areas of Twentynine Palms and Barstow.
One cloudburst hit Cherry Valley with 3" of rain in 30 minutes.
A 75 foot stream of water crossed Highway 66 at Hodge, southwest of Barstow.
Washouts were also reported around Twentynine Palms.
1954: A northward moving hurricane made landfall in central Baja California with the remnants moving into Arizona.
Rainfall of up to 2" occurred in the mountains and deserts starting on 7.17 and ending on this day.
This occurred during the El Niño of 1953-54.
1931: Carson City, NV, had a high temperature of 107° F, while Reno, NV, recorded a high of 105° F.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, Phoenix, & San Diego
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