Saturday, September 21, 2019

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

2016: A large plume of tropical moisture associated with the remnants of of Hurricane Paine surged northward over SoCal.
Persistent light to moderate rain fell for most of the day, atypical for September in SoCal.
The Padres game was delayed for nearly 2 hours.

2010: Summer ended as the coolest since 1933 in the coastal and valley areas, and the 11th coolest overall at San Diego.
A persistent west coast trough and efficient coastal ocean upwelling were the causes.
Low maximum temperature records for at least one station were reached on 54 of the 92 days of summer.
A few days later, the highest temperatures of the year occurred, especially on 9/27.

2007: The first winter storm of the season moved into Central California on September 20.
At least 2" of snow fell on Tioga Pass, and thunderstorms developed over the central and southern San Joaquin Valley, lingering into the late evening.

2005: Remnants of Hurricane Max sweeping northward into Central California, pummeled the San Joaquin Valley and Southern Sierra Foothills with embedded thunderstorms, some of them severe.
A late-afternoon thunderstorm brought hail and brief heavy rains to localized areas in western Fresno and Kings County.
A late afternoon thunderstorm provided large hail...locally heavy rain...and high wind in the western portions of Kings and Fresno Counties.
Outflow south wind caused late season cotton to be laid over in addition to intense rainfall for short periods of time.
The "horizontal rain" totaling 2" in a short period of time with the thunderstorm downburst caused extensive damage to a pistachio treatment plant in Kings County. 
To the east-southeast of Huron in Fresno County 0.58" of rain was reported within a 30 minute time period.
Outflow from afternoon thunderstorms raised numerous areas of blowing dust on the west side of the San Joaquin Valley.
Visibility dropped  to  only  100  feet  in  the  Fresno County community of San Joaquin while several areas from Hanford west to the the Avenal-Coalinga area of Kings-Fresno County experienced lowered visibility in dust and/or heavy rain. 
Naval Air Station Lemoore reported a west-southwest wind gust to 38 knots. Cotton crop damage was reported on the Fresno-Kings County line from thunderstorm southerly high wind along with smaller hail and very heavy rain.
While most hail size reports were "pea" size a couple of reports of larger hail were noted on the west side of the Central San Joaquin Valley by mid-afternoon.

2005: Moisture and instability from former Hurricane Max generated prolific lightning which triggered numerous wildfires across the San Joaquin Valley region and adjacent Sierra Foothills.
A lightning caused fire burned 300 acres northeast of Woodlake in Tulare County during the early morning hours of the 20th.
The lightning-caused Pine Fire, 12-15 miles northeast of Bakersfield, aided by gusty southeast winds burned 1,814 acres in the foothill grasslands.
No structures were lost nor injuries reported.
The first of 3 known lightning strikes within an hour of 1400 PST on the west side of Merced County ignited a small fire southwest of Dos Palos in the West-Central San Joaquin Valley.
The lightning-caused La Paloma Fire burned 700 acres near Hornitos or about 17 miles west of Mariposa in the Southern Sierra Nevada foothills. There were no injuries nor structures lost from the fire.
The lightning-caused Los Banos Fire just west of Interstate Highway 5 and west of the community of Los Banos burned 900 grassland acres before it was contained but no injuries occurred nor structures lost.

2005: Numerous thunderstorms hit northern San Diego County.
Lightning was the big problem, knocking out power, starting a number of tree fires from Carlsbad to Escondido.

1984: Highest minimum temperature records were set each day in San Diego for 18 consecutive days, starting on 9.3 and ending on this day.

1983: Northward moving Hurricane Manuel dissipated off the west coast of northern Baja California with up to3" of rainfall in the southern mountains and deserts on this day and on 9.21.
This occurred during the strong El Niño of 1982-83.

1965: Sonoma had a low temperature of 34° F.

1965: The morning low temperature at Reno, NV was 24° F.

1965: It was 26° F in Idyllwild, the lowest temperature on record for September.
This also occurred on 9.21.68, 9.23.1945, and 9.24.1945.

1952: Hurricane Five tracked up the Baja California coast, sending a surge of moisture into Southern California.
Showers and storms impacted the region from the coast to the deserts over a three-day period centered on this day.
Palm Springs reported 1.46" of rain, while Redlands received 1.33".
This occurred during the El Niño of 1951-52.

1939: A heat wave that started on 9.18 and ended on 9.22 preceded the arrival of a tropical storm called "El Cordonazo."
High temperature records of more than 95° F occurred at San Diego each day, with the highest temperature reaching 106° F on 9.21.
On this day it was 107° F in Escondido and 104° F in the San Diego - College area.
Eight heat-related deaths resulted in LA.
A tropical cyclone moving northwestward, just off the west coast of Mexico, moved into southern Baja California and dissipated.
The moisture from this tropical cyclone generated rainfall of up to three inches in the deserts and mountains starting on 9.19 and ending on 9.21.

1913: Latest triple digit high on record at Yosemite Valley, 101° F.

1913: Death Valley National Park recorded a high temperature of 116° F degrees, setting a daily record.

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

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