Thursday, September 20, 2012

[californiadisasters] On This Date In CA Weather History (September 20)



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.

2005:
A late-afternoon thunderstorm brought hail and brief heavy rains to localized areas in western Fresno and Kings County.
Downburst winds caused extensive damage to a pistachio treatment plant in Kings County and 0.58" of rain fell near Huron in just 30 minutes.

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

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

1952: A tropical storm moving northwest just southwest of Baja California dissipated.
Moisture from this storm resulted in rainfall of up to two inches in the mountains and deserts starting on 9.19 and ending 9.21, with most falling on 9.19.
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° occurred at San Diego each day, with the highest temperature reaching 106° on 9.21.
On this day it was 107° in Escondido and 104° 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°.

1902: The high temperature at Lovelock, NV was 96°.

Source: NWS Hanford, Reno, & San Diego


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