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Tropical Storm “Kay” delivers nearly a year’s worth of rain across Southern California

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Tropical Storm “Kay” delivered nearly a year’s worth of rain across Southern California last week, shattering daily rainfall records.

San Diego registered 16 mm (0.63 inches) of rain on Friday, September 9, 2022, breaking the previous record of 2.28 mm (0.09 inches) set in 1976 and marking its wettest day since December 14, 2021, when 24.8 mm (0.98 inches) of rain was registered.

According to the Desert Research Institute’s Western Regional Climate Center, the possibility of the city receiving 12.7 mm (0.5 inches) of precipitation on a single September day is nearly zero.

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Tropical Storm “Kay” at 00:40 UTC on September 10, 2022. Credit: NOAA/GOES-East, RAMMB/CIRA, The Watchers

“But it wasn’t just the precipitation from the storm that was notable,” Allison Finch of AccuWeather noted.1

Kay also marked the closest approach to Southern California from the Pacific Ocean in the last 50 years.

The next to last point tracked by the National Hurricane Center on September 10 was 209 km (130 miles) offshore from San Diego, making it the closest pass to the city from the ocean side since records began in 1949, according to Jesse Ferrell, AccuWeather senior weather editor and meteorologist.

“The runner-up was Tropical Storm Hyacinth in 1972, which was a little farther out to sea but slightly farther north.”

References:

1 Kay unleashes nearly year’s worth of rain, flash flooding in SoCal – AccuWeather – September 10, 2022

Featured image credit: NOAA/GOES-East, RAMMB/CIRA, The Watchers

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