2018: High sea surface temperatures (SSTs) peaked at the La Jolla Scripps buoy, reaching an all-time maximum of 79.5F, approximately 10 degrees above normal for the date and the highest ever SST measurement from any Southern California buoy.
Numerous other buoys reported temperatures above 78F.
Although SSTs peaked on this day, they remained well above normal for several months during the summer.
Minimum temperatures were much higher than normal at the coast, and it was exceptionally muggy.
2005: A Mesoscale Convective System (MCS) swept into the region from Nevada, bringing thunderstorms to the region for a 21st consecutive day.
The thunderstorms associated with the MCS rolled through the deserts from San Bernardino to San Diego County, causing flash flooding that resulted in 12 swift water rescues.
They also produced severe winds that downed trees and whipped up a dust storm with near zero visibility in the Coachella Valley.
2002: Cloverdale had a high temperature of 107° F.
2000: Dense fog over the coastal waters caused a lone boater, en route from Oceanside to San Diego on a 24 foot sailboat to become disoriented.
After spending two days lost at sea she was forced to call the Coast Guard on this day.
Her vessel was located 40 miles south of Point Loma using Navy prototype radio signal direction finder equipment.
1998: The remnants of Tropical Storm Frank produced showers and thunderstorms from the coast to the Southern California deserts.
Thunderstorms in the Inland Empire produced severe downburst winds that downed trees in tore a 90 ft section of roof from a hotel in Riverside.
1997: Severe thunderstorms rolled across the western part of Las Vegas, NV, producing damaging winds and hail.
Several power poles were snapped along Charleston Blvd., a trailer was destroyed and signs and roofs in the area received damage from both the wind and hail.
19,000 homes lost power for a few hours.
The storms also produced local street flooding with rainfall amounts up to 0.73" in 15 minutes.
Severe thunderstorms with very heavy rain began over central Mohave County around 12:30 am and ended around 2:30 am MST.
Washes rapidly filled in the vicinity of Kingman and several roads were washed out.
At least two cars were caught in a flooded wash and their four occupants had to be rescued by helicopter.
Also, one woman was found dead hours later in a sewer drainage pond.
It is unknown how she was caught in the flood waters.
Another serious result occurred a few hours after the storms ended when a passenger train derailed while crossing a small bridge damaged and weakened by flood waters.
Of the 302 passengers and crew members aboard, 116 were injured and of those eight sustained serious injuries.
1989: One of the most severe convective outbreaks of record in Southern California began on 8.7 and continued until 8.11, when it climaxed.
On this day a thunderstorm unloaded torrential rains on Yuma, AZ with 5.82" of rain in 24 hours, a new record for the state (remarkably the normally driest part of the state) and double the seasonal average.
Up to 1000 homes were flooded with water to 5' deep.
On this day another thunderstorm dropped 0.75" hail on Desert Hot Springs.
1970: Virginia City, NV, had a high temperature of 100° F.
1969: The high temperature at Reno, NV, was 103° F.
1954: This is the only day all month that Fresno recorded a triple digit high temperature with a high of 100° F.
This established a record for the least number of triple digit highs in the month of August in Fresno (this record was tied in August 1956).
1947: Heavy rain washed out around 500 feet of railroad track in Needles, CA.
An ice plant in the city was flooded and machinery was covered with soil. Several hundred feet of roads were washed out as well.
Damages totaled $1 million in 1947 dollars.
1941: A heavy thunderstorm struck Needles.
Flash floods and debris flows damaged streets and highways.
Several motorists were stranded, but no one was hurt.
1936: A tropical cyclone tracked north northwestward across the Gulf of California with the remnants tracking northward into western Arizona.
Locally heavy rainfall occurred in the mountains surrounding Los Angeles.
Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego
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