Los Angeles sees unusual September rains from remnants of Hurricane Linda

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Unusual September Soaker For Los Angeles


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:

14 PHOTOS
Southern California Rain/flooding
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Los Angeles sees unusual September rains from remnants of Hurricane Linda
A woman crosses a street during a steady rainfall on September 15, 2015 in Los Angeles, California, as a low-pressure system filled with moisture from a former tropical cyclone unleashed heavy rain. At least eight people were pulled into rain-swollen San Gabriel River Tuesday as a storm drenched Southern California, flooding freeways and knocking out power. AFP PHOTO /FREDERIC J.BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
LOS ANGELES, CA SEPTEMBER 15, 2015 -- LA City Fire Special Op and Swift Water team members Domingo Albarran, center, and Jesse Franco, right, walk the bank of the LA River at the Fletcher Drive bridge after one of three victims were rescued from high water during rain Tuesday morning, September 15, 2015. (Photo by Al Seib/Los Angeles Times via Getty Images)
LOS ANGELES, CA - SEPTEMBER 15: Fans remain in their seats as rain falls during the fourth inning of the game between the Colorado Rockies and the Los Angeles Dodgers at Dodger Stadium on September 15, 2015 in Los Angeles, California. (Photo by Harry How/Getty Images)
SAN PEDRO, CA - SEPTEMBER 15, 2015: Strollers walk through Point Fermin park after a rainstorm which left puddles along the way on SEPTEMBER 15, 2015. (Photo by Bob Chamberlin/Los Angeles Times via Getty Images)
A woman walks during a steady rainfall on September 15, 2015 in Los Angeles, California, as a low-pressure system filled with moisture from a former tropical cyclone unleashed heavy rain. At least eight people were pulled into rain-swollen San Gabriel River Tuesday as a storm drenched Southern California, flooding freeways and knocking out power. AFP PHOTO /FREDERIC J.BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
A swift-water rescue crew helps a man stranded in a tree in the Los Angeles River near downtown Los Angeles on Tuesday, Sept. 15, 2015. Rescuers were looking for more victims possibly stuck in thick vegetation along the riverbank just north of downtown, in an area known for homeless encampments. A record-breaking storm slammed parched Southern California on Tuesday, sending rainfall gushing down roadways and turning the morning commute treacherous. (AP Photo/Richard Vogel)
A man clears his belongings from the banks of the Los Angeles River near downtown Los Angeles on Tuesday, Sept.15, 2015. Swift-water rescue crews plucked three people and a dog from tree branches as the Los Angeles River swelled from its usual trickle to a raging torrent. A record-breaking storm slammed parched Southern California on Tuesday, sending rainfall gushing down roadways and turning the morning commute treacherous. (AP Photo/Richard Vogel)
A swift-water rescue crew helps a man after he was stranded in a tree in the Los Angeles River near downtown Los Angeles on Tuesday, Sept. 15, 2015. Rescuers were looking for more victims possibly stuck in thick vegetation along the riverbank just north of downtown, in an area known for homeless encampments. A record-breaking storm slammed parched Southern California on Tuesday, sending rainfall gushing down roadways and turning the morning commute treacherous. (AP Photo/Richard Vogel)
A man clears his belongings from the banks of the Los Angeles River near downtown Los Angeles on Tuesday, Sept.15, 2015. A record-breaking storm slammed parched Southern California on Tuesday, sending rainfall gushing down roadways and turning the morning commute treacherous. (AP Photo/Richard Vogel)
A swift-water rescue crew helps a man after he was stranded in a tree in the Los Angeles River near downtown Los Angeles on Tuesday, Sept. 15, 2015. Rescuers were looking for more victims possibly stuck in thick vegetation along the riverbank just north of downtown, in an area known for homeless encampments. A record-breaking storm slammed parched Southern California on Tuesday, sending rainfall gushing down roadways and turning the morning commute treacherous. (AP Photo/Richard Vogel)
Commuter traffic makes it way slowly along the 110 freeway in downtown Los Angeles as heavy rain fall on Tuesday, Sept. 15, 2015. The National Weather Service said a developing low pressure system off the Northern California coast would combine with remnant moisture from former tropical cyclone Linda to bring periods of rain to southwest California through Wednesday morning. A flood advisory was issued for Los Angeles County as Doppler radar and automated rain gauges showed early morning rainfall rates generally between a quarter inch and a third of an inch per hour, with locally higher rates. (AP Photo/Richard Vogel)
Commuter traffic makes it way along a freeway in downtown Los Angeles as heavy rain falls early Tuesday, Sept. 15, 2015. The National Weather Service said a developing low pressure system off the Northern California coast would combine with remnant moisture from former tropical cyclone Linda to bring periods of rain to southwest California through Wednesday morning. (AP Photo/John Antczak)
LOS ANGELES, CA - SEPTEMBER 15, 2015: Dan Thompson of San Pedro walks his dog 'Doc' through Point Fermin park after a rainstorm which left puddles along the way on SEPTEMBER 15, 2015. (Photo by Bob Chamberlin/Los Angeles Times via Getty Images)
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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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