2017: Two giant supercell thunderstorms unleashed their fury on the Anza Borrego Desert.
Flash flooding and wind damage occurred around Agua Caliente Springs and Canebrake.
2014: A heavy thunderstorm produced a debris flow on the Banner Grade east of Julian that was one to two feet deep along Hwy. 78.
The Banner Fire burn scar contributed to this flow.2012: A pair of severe thunderstorms formed along the "Elsinore Convergence Zone" in the Inland Empire.
A funnel cloud was observed north of Lake Elsinore in the Alberhill area.
The storms were associated with microburst winds in excess of 60 mph near Perris.
Several power poles were snapped off completely, trapping several vehicles.
Roof damage was observed.
Roof damage was observed.
One storm also produced a brief landspout tornado near Nuevo, but caused no damage.
Lightning strikes near Julian started numerous wildfires that would merge to become the Vallecito Lightning Complex, which consumed 22,828 acres before it ws extinguished on August 19th.
2005: Fresno reached 21 days with a high temperature of 100° F or more.
This set a new record for the longest streak of triple digit temperatures here.
2001: The Kingman, AZ (Mohave Co.), automated weather station reported a wind gust to 70 mph which caused damage to numerous homes, several with roofs torn off.
The strong winds also flipped an unoccupied mobile home.
The storm also caused a brick to slam through a vehicle's window striking a teenager in the head causing minor injuries.
1998: Strong thunderstorms developed each day in the valleys and the deserts starting on this day and ending on 8.14.
Flash flooding and very strong winds resulted in Apple Valley.
A thunderstorm in Hemet produced a downburst with winds to 70 mph and 0.75" hail that damaged buildings, trees, and power lines.
Golf ball size hail fell at Cajon Pass.
1.6" of rain fell in 30 minutes at Boulevard.
1997: The Antelope Canyon flash flood.
A distant thunderstorm produces a flash flood in a slot canyon near Lake Powell.
Eleven hikers are swept to their deaths.
Since the hikers were tourists from Europe, the story makes international news.
A camera recovered after the event reveals a 50 to 80 foot wall of water sweeping through the canyon.
1996: Priest Valley had a high temperature of 107° F.
1994: A tornado touched down in Valle Vista (east of Hemet) and several funnel clouds were also observed in Hemet.
A home was damaged and a trailer was destroyed.
Trees were uprooted and power poles were blown over.
It was 109° F in Escondido, the highest temperature on record for August and the third highest on record.
1990: A severe thunderstorm struck the Warner Springs and Ranchita area.
Golf ball size hail was common and the largest measured hail was fully 2" in diameter.
There were also 30-40 mph winds with the storm.
1986: A severe thunderstorm struck Needles.
Streets were flooded and motorists were stranded.
Winds blew out windows of several businesses and ripped off a roof of an apartment building.
1981: A complex of thunderstorms brought chaotic weather to eastern portions of Riverside, San Bernardino, and Imperial Counties, with outflow winds approaching 100 mph.
In Indio, 20 railroad cars were ripped from the tracks, several roofs were torn from homes and numerous trees and powerlines were toppled.
1973: With a morning low of 96° F, Daggett, CA, records its all-time warmest low temperature.
1972: Tropical Storm Diane sent moisture into the region which produced thunderstorms across Southern California.
2.1" of rain fell in Lucerne Valley in less than one hour.
0.38" fell in Riverside, and 0.31" in Big Bear Lake.
Flash floods left a foot of silt on downtown Lucerne Valley and closed several highways, including Interstate 15 northeast of Barstow.
Lightning in Norco killed a boy.
1971: A curved rope-like tornado moved across open desert in East Las Vegas, NV.
1971: During the time from 8.11 to 8.13 it was 100° F in Palomar Mountain.
This highest temperature on record occurred on five other days as well.
1965: Tahoe City (west shore Lake Tahoe) recorded 1.4" of precipitation.
1933: The high temperature in Reno, NV, reported at 102° F.
1933: A heat wave began on 8.10 and ended on 8.13 in the valleys of Southern California; temperatures topped 110° for several consecutive days.
Riverside hit 114° on this day, the highest temperature on record for August.
Greenland Ranch in the Death Valley area reached 127° establishing a new record high temperature for August.
1910: A big fire at Keswick (Shasta Co.) consumed a dozen dwellings in the south part of the old town.
The fire originated from a blazing pile of rubbish, scattering embers and resulting in the destruction of a dozen buildings on the extreme southern end of California Street.
Nobody had any insurance, and there was no water to fight the flames.
1891: Two thunderstorms merged and produced a rainfall of 16.10" at Campo; 11.5" of it fell in 80 minutes, a record 80 minute rainfall for the state (and at one time the record 80 minute rainfall for the nation).
1873: 1.95" of rain fell in San Diego from a tropical storm on 8.11 and on this day.
1.8" fell on this day, the wettest calendar day in August on record.
1.72" fell in Paradise Valley (SE San Diego).
Nearly 3" fell in "Cajon Ranch" (probably El Cajon).
This was called the greatest summer rainfall in history.
The previous daily August rainfall record was 0.31" in 1867.
One foot of water was reported on the ground in Cajon Ranch.
Winds "stiffened up to quite a gale".
Damage was done to roof tops and trees were felled.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, Phoenix, & San Diego as well as the Redding Record-Searchlight
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