Record breaking heat wave will continue to affect much of the western United States through this holiday weekend. The heat also lingers for the lower Mississippi Valley and Southern Plains, then shifts over the mid-Atlantic and Southeast. Severe weather and flooding concerns through today for the Midwest, Ohio Valley, and Southern Plains. We continue to closely watch the track of Hurricane Beryl. Read More >
El Niño: A warming of the ocean surface, or above-average sea surface temperatures (SST), in the central and eastern tropical Pacific Ocean. Over Indonesia, rainfall tends to become reduced while rainfall increases over the tropical Pacific Ocean. The low-level surface winds, which normally blow from east to west along the equator (“easterly winds”), instead weaken or, in some cases, start blowing the other direction (from west to east or “westerly winds”).
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Northern Sierra Precipitation (8-station Index in Sacramento Basin)
Central Sierra Precipitation (5-station Index in San Joaquin Basin)
Southern Sierra Precipitation (6-station Index in Tulare Basin)
Maps
El Niño 2015/16: A Historical Perspective (NCEI)
U.S. Risk of Seasonal Extremes During ENSO (ESRL)
ENSO across NOAA
El Niño/Southern Oscillation (NCEI)
ENSO Research and Monitoring (ESRL)
Societal & ecosystem impacts