Convection over Indonesia was reduced, too, another characteristic of the weaker Walker circulation. Over the past month, evidence of the weakened Walker circulation appeared in the form of weaker trade winds over the western Pacific and more clouds and rain over the equatorial Pacific. Anomalous ocean warming in the central and eastern Pacific (orange) help to shift a rising branch of the Walker Circulation to east of 180°, while sinking branches shift to over the Maritime continent and northern South America. Generalized Walker Circulation (December-February) anomaly during El Niño events, overlaid on map of average sea surface temperature anomalies. These strong surface winds help to keep the warm water piled up in the western Pacific. The average Walker circulation is characterized by rising air and storms (convection) over the very warm waters of the far western Pacific, west-to-east winds high up in the atmosphere, descending motion over the relatively cooler waters of the eastern Pacific, and the trade winds-east-to-west surface winds. The third criteria, “indications of a weaker Walker circulation,” refers to the average atmospheric pattern over the equatorial Pacific. We anticipate that it will remain above this El Niño threshold for the next several months, based on climate model predictions and current conditions in the tropical Pacific (more on this in a minute)… check! There are the first two of our three rings criteria. NOAA, based on Coral Reef Watch maps available from NOAA View. A higher-resolution version of this animation is available as a movie. The waters in the key monitoring region, which scientists call "the Niño-3.4 region," start out cooler than average (blue) and progressively become warmer than average (red) as La Niña ends and El Niño arrives. Source: National Weather Service Forecast Office, Los Angeles and NOAA National Climate Data Center.Animation of maps of sea surface temperatures in the Pacific Ocean compared to the long-term average over five-day periods from the end of January to early June 2023. The Almanac has some questions about whether these zero measurements reflected actual minimum temperatures at that time.ħ) Santa Fe Dam Recreational Area, Irwindale These were interspaced with daily low temperatures in the 40s and 50s. * There were several zero temperature measurements in the last week of December 1994 and the following January. Record years are the latest year in which records were either set or tied. Annual record high and low temperatures for each station are listed under "Annual" column. Record high temperatures are bolded in red and record low temperatures bolded in blue for each station. Record Monthly Temperatures & Year of Record The Almanac has some questions about whether these zero measurements reflected actual minimum temperatures at that time. There were several zero temperature measurements in the last week of December 1994 and during January 1995. The latest lowest temperature recorded in Los Angeles County was 0 oF in Saugus in Santa Clarita on January 12, 1995. Also reaching or exceeding 120 oF were Saugus in Santa Clarita on November 8, 2002, at 126 oF and Woodland Hills in the San Fernando Valley, on September 6, 2020, at 120 oF. This very rare extreme temperature is typically only reached in Death Valley in the California desert. The highest temperature ever recorded among the 18 Los Angeles County weather stations monitored by the Almanac (according to NOAA's National Centers for Environmental Information) was 130 oF at Santa Fe Dam in the San Gabriel Valley, on June 17, 2012, at 3:57 p.m. Year is the latest for that record temperature. County Stationsĭowntown Los Angeles & Los Angeles International Airport Monthly High/Low & Average Temperatures for Downtown Los Angeles Daily High/Low Temperatures for Downtown Los Angeles Monthly Temperature Normals & Records for Downtown Los Angeles Monthly Climate Normals at Select Los Angeles County Locations Court & Vital Records from Orange County, CA.Postal Zip Code Look-up for Los Angeles County.The Los Angeles Basin - A Huge Bowl of Sand.Can a Volcanic Eruption Occur in Los Angeles?.
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