Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Storm Warning: Advancements in Marine Forecasting since the Edmund Fitzgerald

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Forecast Format

Example from 1975

Example from 2010

Gridded Forecasts

Gridded Forecast Datasets

In the last 10 years, additional gridded forecast products have been developed by the National Weather Service. These gridded products allow forecasters at the NWS to provide specific forecast information every 1.5 miles for a variety of weather elements, such as waves, winds, temperatures, and weather. In turn, graphics such as those below can be generated, allowing customers and partners to get a complete picture of the weather across the Great Lakes. For further gridded forecast information for the Great Lakes, please go to https://weather.gov/greatlakes.

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