Los Angeles sees unusual September rains from remnants of Hurricane Linda
An unusual September soaking moved into the Los Angeles metro area Tuesday morning, partially due to the remnant low-level moisture of former eastern Pacific Hurricane Linda.
The steady rain led to three water rescues on the rain-swollen L.A. River, the Los Angeles Fire Department said in a tweet. They noted that all water rescues were complete as of 9:40 a.m., local time.
In addition, apartments were evacuated in a three-story building in West Hollywood after water entered the roof, Los Angeles County Fire Department officials told The Associated Press.
Los Angeles received 2.39 inches of rain Tuesday, making it the second wettest September day on record at the downtown observation station where records date back to 1877. Average rainfall for the entire month of September is just 0.24 inches.
(MORE: L.A. Forecast and Radar)
Tuesday's rainfall also made it the wettest day in over four years in Los Angeles. The last wetter calendar day than Tuesday in downtown L.A. was a 2.42 inch deluge on March 20, 2011. Tuesday was wetter than this past January (1.09 inches), February (0.83 inches) or March (0.87 inches), typically their three wettest months of the year.
San Diego's Lindbergh Field also tallied its second wettest September day on record (1.15 inches), topped only by a September day during the presidency of Warren G. Harding (1.23 inches; Sep. 30, 1921).
For a time on Tuesday, the National Weather Service had issued a flood advisory for the rainfall, saying that localized flooding of intersections and low-lying areas was possible.
The traffic conditions map from California's DOT showed heavy traffic and numerous incidents on highways around the Los Angeles area on Tuesday morning.
September 2015 now joins several other strong El Niño years that were wetter-than-average in Los Angeles, according to weather.com meteorologist Jonathan Erdman. This includes September 1997, 1982, 1965 and 1939. September 1983, which was just after the 1982-83 strong El Niño, was also wetter-than-average. A developing El Niño in 1986 also had above-average rainfall in September.
(MORE: Strong El Niño Has Arrived)
"The 1939 and 1976 events were directly driven by tropical cyclones, while 1965, 1983 and 1986 were more synoptically driven like this event," said WSI chief meteorologist, Dr. Todd Crawford.
"This isn't what you'd think of as a classic El Niño-driven signature, with a deep and significant tropical connection. Instead, this rain was synoptically driven, with an unseasonably strong cold front stalling out over Southern California, where southerly winds have advected deep low-level tropical moisture from Baja California, where sea-surface temperatures are unusually warm."
See photos from the recent storms:
The remnant moisture from Linda was pulled inland by a jet stream dip that has moved south along the West Coast, leading to much cooler conditions compared to this past weekend and last week. Los Angeles had seen eight straight days in the 90s through Sunday. Linda dissipated on Sept. 10, but its remnants continued to move northwest in the Pacific before moving inland on Tuesday.
(MORE: Weather Pattern Change This Week)
Interestingly, while the rain was ongoing in Southern California, water vapor imagery showed very dry conditions aloft, indicating the moisture was mainly confined to lowest levels of the atmosphere.
MORE ON WEATHER.COM: Destructive Northern California Wildfires in September 2015
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