[californiadisasters] On This Date In CA Weather History (December 21)

2010: A very wet period began 12/17 and continued through 12/22 as strong westerly flow across the Pacific tapped a pool of deep subtropical moisture near Hawaii, resulting in days of moderate to heavy rainfall.
4"-12" of rain fell in the coastal and valley areas over six days, 12"-28" in the mountains, up to 9" in the high desert and less than 4" in the lower desert.
Major landslides and flash flooding impacted the communities of Laguna Beach, Apple Valley, along the Whitewater Channel in the Coachella Valley near Palm Springs, Highland, Corona, Loma Linda, La Jolla, and the city of San Diego from this day to 12.22.
Qualcomm Stadium was flooded, but was miraculously drained and prepared for the Poinsettia Bowl held there on 12/23.
Heavy wet snow accumulated above 6500 feet with amounts over 6" and as much as 24" above 7500 feet.

2005: A powerful storm in the east Pacific generated large surf with sets of 20 feet.
Broken surfboards, rescues, and beach erosion resulted.
All piers were shut down and many were overtopped by the surf.
Sea water flooded a parking lot in Carlsbad and floated several cars.
Boardwalk damage occurred in Dana Point.
Tow-in surfing occurred only 1.5 miles off Seal Beach.

1999: Santa Ana winds started on this day and ended on 12.22.
A gust of 68 mph was measured at Campo, 53 mph at Huntington Beach, and 44 mph in Orange.
House and tree damage occurred in Hemet.

1997: A waterspout hit Huntington Beach, becoming a tornado.
Damage was done to boats, houses, and city property.
A period of Santa Ana winds that started on 12.18 ended on this day.
Gusts of 60 mph were reported at Rialto.
Gusts of 67 mph were reported at Idyllwild and below Cajon Pass.
One was killed.
The winds downed trees, caused widespread wind damage and contributed to a fire.

1996: A storm that started on this day and ended on 12.22 spread rainfall of 2" in the coastal areas, and 2"-5" in the inland valleys and foothills.
Storm winds were measured at 40 to 50 mph.

1996: 39" of snow fell at Boca, with 37" inches at Tahoe City.
The 36" of snowfall at Dagget Pass is still the one-day snowfall record for Nevada.

1991: Strong northerly winds resulted from a deep low pressure system over Arizona starting on 12.19 and ending on this day.
Top gusts reached 63 mph in the Santa Monica Mountains, 52 mph in Van Nuys, and 36 mph at LAX airport.

1990: Third day in a row with snow flurries observed in Fresno.

1979: An F0 tornado touched down at Dos Palos (San Joaquin Valley).

1970: A series of storms brought heavy rain and snow to the region starting on 12.17 and ending on 12.22.
7.03" of precipitation was recorded in Palomar Mountain, 6.93" in Lytle Creek, 6.35" in Lake Arrowhead, 5.38" in Idyllwild, 4.72" in Big Bear Lake, 2.81" in San Bernardino, 2.67" in Santa Ana, 2.27" in Riverside, and 1.84" in San Diego.
Several roads were flooded and washed out in the northern Inland Empire, exacerbated by the extensive burn areas from earlier in the fall.
Snowfall amounts were 32" in Idyllwild, 28" in Big Bear Lake, 26" in Palomar Mountain, and 24" in Lake Arrowhead.
On this day 11 inches of snow fell in Idyllwild, the greatest daily snowfall on record for December.

1968: A very cold air mass settled over the region, setting numerous low temperature records (both maximum and minimum).
It was 2° in Idyllwild, the lowest temperature on record for December, and the second lowest temperature on record.

1913: 11" of snow fell at Cedarville.

1909: From the 20th into the 21st, Mojave received 10.4" of snow.
Just twenty four hours later another storm brought another 2" of snow here.

Source: NWS Hanford, Reno, & San Diego


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