2014: Thunderstorms in Nuevo and in Menifee (both in Riverside Co.) dropped hail 1" in diameter.
Lightning struck a building and some palm trees in Riverside, knocking out power at a community college and igniting palm trees.
2003: High wind from a monsoonal thunderstorm led to power transmission line damage, subsequent power outage, and reports from spotters of visibility restrictions from blowing dust in the Lindsay area on the 20th due to a collapsing thunderstorm cell.
A lightning strike ignited a stack of 800 bales of hay southwest of Porterville as well as two other locations within the city limits of Porterville.
2003: Monsoonal thunderstorms struck the mountains of eastern Kern County on this date.
Water from nearby washes and small, normally dry creeks ran through the town of Lake Isabella late in the afternoon of the 20th.
Rainfall rates of 1" in 15 minutes was reported by the Kern Fire Department with radar estimates of 1-3" per hour in the mountains to the east and south. Additional flooding was reported from Erskine and Bodfish Creeks just southwest of Lake Isabellaand also just east of the Walker Basin/Piute Kern County Fire Station.
Trees and power poles were carried over Highway 178 in the water flow off nearby mountains ENE of Lake Isabella.
Some of the heavier rain amounts reported for the 20th: 1.78" at Piute KCFD Station in the Kern Mountains; 1.24" at Blackrock RAWS in the Southern Sierra Nevada Mountains; and 1.24" at Laural Mountain in the Kern Desert.
2003: Thunderstorms developed in the mountains and the desert, dropping 3" of rain in at Yucca Valley, 2.63" in one hour and seven minutes in San Felipe Valley, and 1.92" in two hours in Ocotillo Wells.
Flash flooding hit five residences in Yucca Valley.
Three people lost their lives and two swift water rescues were made from trapped vehicles in Twentynine Palms.
Numerous washes were flooded.
Hwy. S2 near Warner Springs was closed to flooding.
In all, flash flooding led to 21 swift water rescues and inundated 19 businesses and 125 homes
2.60" fell in Big Bear Lake, the greatest daily amount on record for August.
2001: The North Fork Fire was ignited by a rail-splitter accidentally and burned 4,132 acres southeast of Bass Lake.
There were 2 primary structures lost but no fatalities or injuries.
Damage was $4.1 million.
1997: The remnants of tropical storm Ignacio produced record rainfall over portions of northern and central California.
24 hour and 1 hour rainfall records were exceeded at San Francisco, and it was the second wettest August ever recorded in the City.
General rainfall totals ranged from 0.5 to 1.5" in the northern San Francisco Bay Area with 0.5 to 2.27" farther south along the immediate coastal range.
Along the central coast, Three Peaks in the Santa Lucia Mountains of Monterey County had a rain rate of just over 0.9" an hour and a 24 hour total of 2.2".
The greatest hourly rainfall rate at San Francisco Duboce Park was 0.22" between 11 pm and midnight on August 19, which set a record one hour maximum rainfall rate for August.
Redwood City received .81" of rain -- a record for the month.
1997: The remnants of Tropical Storm Ignacio tracked northward moving inland in central California with gale force winds over portions of the Southern California coastal waters. This occurred during the strong El Niño of 1997-98.
1997: Redwood City received 0.81" of rain -- a record for the month.
1995: Heavy rains during the night of August 20-21 drop 1.94" of rain on Mojave.
This amount is 31.6% of Mojave's normal seasonal rainfall of 6.14".
The normal monthly rainfall for August at Mojave is 0.2".
1990: Portola recorded 2.02" of precipitation.
1988: A thunderstorm dumped 2" of rain in 45 minutes on the Calico Mountains near Barstow.
The resulting flash flood sent a two-foot surge of water through the parking lot at Calico Ghost Town.
At least 5 vehicles were heavily damaged.
The flood then continued south inundating a portion of Interstate 15.
1984: Flooding at Onyx.
Sodie Creek overflowed its banks resulting in four homes being damaged by mud and one home washing away.
0.66" of rain fell in just 40 minutes.
1973: The Las Vegas Wash Marina was severely damaged by a thunderstorm which struck the Lake Mead and Las Vegas, NV, area.
First reports from the Park Rangers indicated that the dock walkway was collapsed "like an accordion."
Damage was also reported at the Echo Bay Marina and the Callville Bay Marina.
1972: Dust storms in the far south end of the San Joaquin Valley cause two fatal chain-reaction accidents.
One, on Interstate 5, involved 30 vehicles and resulted in four fatalities and 80 injuries.
The other, on Highway 99 south of Bakersfield, involved 50 vehicles and resulted in 3 fatalities and 16 injuries.
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 this day and on 8.21.
This occurred during the La Niña of 1920-21.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego
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