2014: An upper level low that produced thunderstorms over the coast of Southern California the prior day, moved inland into the High and Low Deserts.
Severe thunderstorms formed and dropped 1" diameter hail on Nuevo, Mt. Laguna, and Pine Valley.
Additional severe storms in Imperial County produced a haboob which generated winds in excess of 60 mph that toppled power poles in Imperial and tipped big rigs along I-8.
The dust reduced visibility to near zero and knocked down a tree.
The wind also produced a dust storm that meandered through the Coachella Valley.
Further north in the Mojave Desert, flashflooding was reported in Twentynine Palms, Essex, Danby, and Cima Dome, disrupting desert highways between Interstates 15 and 40.
2012: A severe outbreak of monsoonal thunderstorms caused widespread disruption across the Southern California deserts.
Flash flooding occurred on Scotty's Castle Road between Scotty's Castle and the National Park boundary which washed out the roadbed.
The road to Ubehebe Crater was also closed due to flooding.
Amboy Road near Shadow Mountain Road was closed due to flashflooding.
A trained spotter in Twentynine Palms reported large rocks and debris with water running across State 62 in multiple locations from Amboy Road to Godwin Road.
Water flowed over State Route 62 near Sunburst Street in Joshua Tree leaving mud and debris on the highway.
One foot of water and debris flowed across Goff's Road and a truck was stuck in the water due to flooding.
One person was stranded in fast-moving water just south of the Hole in the Wall Campground 11 miles NE of Mitchell Caverns.
Highway 95 was closed due to water and debris flowing across the road near Mile Marker 70 and near Mile Marker 61.
Further north US 95 was rendered impassable due to flooding just south of the CA-NV border. A semi stalled in the middle of the roadway.
2012: Monsoonal thunderstorms pummeled the Las Vegas Valley area.
Several inches of water flooded various parts of Las Vegas Boulevard south mainly in the End Lanes. Numerous vehicles were stuck in floodwaters throughout the south end of the Las Vegas Valley.
14,000 customers lost power in northeast Las Vegas due to the water. Another 3,000 customers lost power in other neighborhoods in the Las Vegas Valley.
There were at least 20 swiftwater rescues in Las Vegas Valley.
The city of Henderson, NV, reported several intersections underwater.
The Clark County Coroner Office confirmed a 17 year-old boy died after he fell into a wash near Stephanie and Sunset in Henderson.
His body was found on August 24th in the wetlands west of Broadbent Boulevard.
2006: The Boundary Fire located 1.5 miles northwest of El Capitan near Yosemite Village was a human caused fire that burned 536 acres.
The fire cost $2.1 million to fight but no structures were lost nor did any casualties occur.
2005: The "33" Fire of undetermined origin burned 400 acres 7.6 miles northeast of Madera on the 21st.
The cost to fight the fire was unknown but no structures were lost nor injuries occurred.
2003: Heavy thunderstorms drenched parts of the Kern County mountains in the morning hours.
Piute measured 1.78" of rain.
The West Kern Fire 10 miles ESE of Mineral King was lightning-ignited during the afternoon of the 21st. It reached a size of 120 acres by the end of the month but it was managed as a resource burn.
There were no injuries as the result of this fire.
The same monsoonal outbreak sent thunderstorms the San Joaquin Valley.
Two instances of broken tree limbs in Reedley (Fresno Co.) in the Central San Joaquin Valley resulted in power outages from damaged power lines.
Over 2,200 Reedley residents were without power on the evening of the 21st due to continued thunderstorm activity over the east Valley floor.
1982: The high temperature at Reno, NV, was 100° F.
1971: A heavy thunderstorm hit Needles with nearly 2" of rainfall.
Flash flooding and debris flows wiped out several roads and swept several vehicles off roads.
1968: San Jose received 1.92" of rain -- its greatest one day rainfall during the summer months.
1959: It was 45° F in Santa Ana, the lowest temperature on record for August.
This also occurred on 8.17.1918.
1957: A total of 2.58" of rain was officially recorded in Las Vegas making this the wettest calendar day on record.
The storms tore up highways, county roads, isolated Vegas Heights, and caused damage to city streets estimated at $50,000.
1934: A tsunami hit San Diego with 20' maximum amplitude from a local sea quake.
1921: The remnants of a tropical cyclone tracked northward into western Arizona from central Baja California generating rainfall of up to 2" in the deserts and southern mountains of southern California on 8.20 and on this day.
This occurred during the La Niña of 1920-21.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego
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