Saturday, July 20, 2019

[CaliforniaDisasters] On This Date In California Weather History (July 20)

2014: Strong thunderstorms produced flash flooding in Yosemite National Park over
the burn scar from the large Rim Fire that occurred during the summer of 2013.
Debris flows were reported along Granite Creek with around 2" of rain falling in a period of two hours; in fact, over 1.5" fell during the first hour!

2008: Outflow from intense monsoon activity over Arizona ignited strong early morning thunderstorms over the Coachella Valley and desert slopes over the San Jacinto and San Bernardino Mountains.
Rain rates with the most intense storms exceeded 1.25 inches in 30 minutes. Intense runoff resulted in a flash flood that raced down Eagle Canyon, across Highway 111 and into Cathedral City.
Debris consisting of rocks, a fence, mud, and tree limbs caused the closure of Highway 111 and damaged 20 homes.

2006: A thunderstorm tracked across the southwestern portion of Yosemite National Park during the afternoon hours knocking down trees and power lines at El Portal and as well as downing trees along the Wawona Highway.
In the Kern County desert, a thunderstorm trekked through in the late afternoon hours causing trees and power lines to fall and even blowing out car windows.

1998: An easterly wave moving over Southern California helped to initiate rare thunderstorms along the San Diego County coast.
The storms developed near Vista and moved south to La Jolla and Point Loma.
Urban flooding was reported at Mission Beach and Pacific Beach.
In addition, lightning strikes set several trees ablaze, struck a Clairemont home and knocked out power to 21,000 homes and businesses in Clairemont and Point Loma.

1998: Severe thunderstorms moved into the Las Vegas Valley and nearby Lake Mead bringing wind gusts in excess of 60 mph and heavy showers which dumped between 1.50" and 2.25" of rain overnight.
Several marinas on Lake Mead suffered extensive wind damage and numerous roads were washed out.
In the Las Vegas Valley, heavy rain and flooding produced the majority of damage.
Major flooding began in the early morning of July 20 and kept washes filled for several hours with numerous swift water rescues performed during the period.
One man apparently died of a heart attack while rescue personnel were trying to remove him from his car.
Rapidly accumulating water and a clogged drainage system caused the roof of the Palace Station Hotel and Casino to collapse, causing millions of dollars in damage.
A few hours later, the same hotel and casino caught fire when it was struck by lightning.

1996: Ben Lomond had a high temperature of 107
° F.

1988: A severe thunderstorm developed along the Elsinore Convergence Zone in the Inland Empire.
The storm produced a microburst in Perris that damaged or destroyed 3 sailplanes and 31 ultralights.
Total damages exceeded $500,000.

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.
It was 39° F in Palomar Mountain, the lowest temperature on record for July.
This also occurred two days previous on 7.18 and on the next day 7.21.

1979: Thunderstorms hit Southern California, especially hard in the Coachella Valley and surrounding mountains.
1.92" of rain fell in Idyllwild and 1.29" fell in Borrego Springs, each the greatest daily amount on record for July.
2.5" of rain fell in Palm Springs, 1.1" fell in Palomar Mountain and 1.09" fell in Big Bear Lake.
Around Palm Desert and Rancho Mirage a debris flow killed one and caused $7 million damage.
Flash flooding hit hundreds of homes in Rancho Mirage, Palm Desert and La Quinta.
Some residents were swept out of their homes during the night.

1974: A tornado slammed into the southwest side of Hemet.
Winds were estimated at over 100 mph.
Three small planes and five gliders were destroyed. Several hangars sustained damage.
One person was injured by flying glass from a shattered window.
This same storm dropped 2.39" of rain on Hemet in one hour. .

1960: Paso Robles ties its all-time high of 115° F.

1956: A flash flood in northwest Reno, NV, destroyed homes and flooded businesses.

1931: Both Reno, NV, and Carson City, NV, recorded high temperatures of 106° F.
Tahoe City registered its all-time record high temperature for the month of July with a reading of 93° F.

1915: An all-time high temperature of 115° F was recorded at Yosemite Valley at the National Park Headquarters (around 4,000 feet in elevation).
This was the warmest day in a streak of 7 consecutive days of 110° F or better at Yosemite Valley that extended from July 19th through the 25th.

Source: NWS San Francisco/Monterey, Hanford, Reno, Las Vegas, & San Diego

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