El Niño has officially arrived

El Niño has officially arrived.

The return of the recurring climate pattern was announced by the National Oceanic and Atmospheric Administration (NOAA) Thursday morning.

Forecasters expect this to be a weak El Niño; however, its impacts will still be felt across the United States, particularly in the southern half of the country where wetter conditions are expected during the coming months, as AccuWeather meteorologists recently predicted in its U.S. spring forecast.

El Niño is a part of a routine climate pattern that occurs when sea surface temperatures in the tropical Pacific Ocean rise to above-normal levels for an extended period of time.

“El Niño conditions across the equatorial Pacific have come together, and we can now announce its arrival,” said Mike Halpert, deputy director, NOAA’s Climate Prediction Center, and ENSO forecaster. “While sea surface temperatures are above average, current observations and climate models indicate that this El Niño will be weak, meaning we do not expect significant global impacts through the remainder of winter and into the spring.” 

There is about a 55-percent chance that El Niño conditions will continue through the spring, according to NOAA. 

“El Niño has officially 'barely' been classified [since] sea surface temperatures have been flirting back and forth above and below 0.5 degrees Celsius," AccuWeather Meteorologist Brett Rossio said. "Despite being a weak El Niño, places in California and Texas will likely be rather wet as we get into the spring months. An active Pacific jet stream will provide deep Pacific moisture across much of the Lower 48, keeping it relatively mild, albeit the air will feel cooler on average across the South where heavy rain will persist and prevent strong warmups as we typically see in the spring months."

Parts of the country have already felt the effects of the El Niño pattern this winter.

“Very heavy rain across California has already been a strong indication that we have experienced the effects of El Niño," Rossio said.

Additionally, an El Niño pattern can have implications for an active tropical cyclone season in the eastern Pacific and could potentially suppress tropical development in parts of the Atlantic basin. 

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California El Nino Storms
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California El Nino Storms

In a photo provided by Mike Eliason, Bo Sailor of Goleta, Caif. watches as high surf crashes into the wall and spills onto Channel Drive in Montecito, Calif. on Thursday, Jan. 7, 2016. The ocean-water-quality advisory issued Thursday came as the latest storms moved east after pummeling the region with heavy rainfall. Bacteria levels can increase significantly during and after rainstorms as contaminants in the runoff enter the ocean via storm drains, creeks and rivers. (Mike Eliason via AP)

High surf batters the break wall at Cabrillo Beach in San Pedro, Calif., Thursday morning, Jan. 7, 2016, as another powerful El Nino-driven storm lashed coastal areas of California on Thursday. The storm created waves that forecasters said could reach 16 feet while sending scattered thundershowers across inland areas. (Chuck Bennett/Daily Breeze via AP)

SANTA PAULA, CA - JANUARY 07: A rainbow fills the sky above the Thomas Aquinas College in the Topatopa Mountains near Santa Paula Thursday afternoon January 07, 2016 as the latest El Nino storm moves through Southern California with more rain and heavy surf. (Photo by Al Seib/Los Angeles Times via Getty Images)
SOLVANG, CA - DECEMBER 25: A full moon sets over a dry Santa Ynez River on December 25, 2016, in Solvang, California. Because of its close proximity to Southern California and Los Angeles population centers and Mediterranean climate, the coastal regions of Santa Barbara have become a popular weekend getaway destination for millions of tourists each year. (Photo by George Rose/Getty Images)
LONG BEACH, CA - JANUARY 07: Bitelio Ramirez, 52, looks out over tons of trash and debris has piled up near the mouth of the Los Angeles River after two days of heavy rain fell in Southern California from El Nino generated storms. Two cranes were being used to lift out somewhere around 300 tons of trash, according to a worker on the scene. (Photo by Rick Loomis/Los Angeles Times via Getty Images)
People stand near a sink hold caused from recent storms in San Diego, California on January 7, 2016. The first major El Nino storm of the season battered southern California this week, bringing heavy rain to the drought-stricken region and causing flooding and mudslides in some areas. Several El Nino storms are expected to hit California in the coming weeks, but experts warn that the rainfall will not be enough to help the region recover from a historic drought. AFP PHOTO/ BILL WECHTER / AFP / Bill Wechter (Photo credit should read BILL WECHTER/AFP/Getty Images)
SANTA PAULA, CA - JANUARY 07: A rainbow fills the sky in the Topatopa Mountains near Santa Paula Thursday afternoon January 07, 2016 as the latest El Nino storm moves through Southern California with more rain and heavy surf. (Photo by Al Seib/Los Angeles Times via Getty Images)
A restaurant entrance is mirrored by flood waters after heavy rains in San Diego, California on January 7, 2016. The first major El Nino storm of the season battered southern California this week, bringing heavy rain to the drought-stricken region and causing flooding and mudslides in some areas. Several El Nino storms are expected to hit California in the coming weeks, but experts warn that the rainfall will not be enough to help the region recover from a historic drought. AFP PHOTO/ BILL WECHTER / AFP / Bill Wechter (Photo credit should read BILL WECHTER/AFP/Getty Images)
A City of San Diego crew member cleans up debris in a road after heavy storms and flooding in San Diego, California on January 7, 2016. The first major El Nino storm of the season battered southern California this week, bringing heavy rain to the drought-stricken region and causing flooding and mudslides in some areas. Several El Nino storms are expected to hit California in the coming weeks, but experts warn that the rainfall will not be enough to help the region recover from a historic drought. AFP PHOTO/ BILL WECHTER / AFP / Bill Wechter (Photo credit should read BILL WECHTER/AFP/Getty Images)
warning light stands submerged on the Camino de la Reina which is flooded by the San Diego River after heavy rains in San Diego, California on January 7, 2016. The first major El Nino storm of the season battered southern California this week, bringing heavy rain to the drought-stricken region and causing flooding and mudslides in some areas. Several El Nino storms are expected to hit California in the coming weeks, but experts warn that the rainfall will not be enough to help the region recover from a historic drought. AFP PHOTO/ BILL WECHTER / AFP / Bill Wechter (Photo credit should read BILL WECHTER/AFP/Getty Images)
VENTURA, CA - JANUARY 06: Homes at Mondo's Beach between the Solimar and Faria Beach communities west of Ventura have their sea walls tested Wednesday morning, January 06, 2016, as the third storm this season's El Nino moves in with more rain and heavy surf. (Photo by Al Seib/Los Angeles Times via Getty Images)
LONG BEACH, CA. -- TUESDAY, JANUARY 5, 2015 -- A front end loader and dump truck work to move beach sand to protect vulnerable areas from flooding in rainy weather during the first big storm in what is predicted to be a strong El Nino event in Southern California January 5, 2016. (Photo by Rick Loomis/Los Angeles Times via Getty Images)
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