National Weather Service forecasters say nearly continuous onshore flow will keep California and portions of the Pacific Northwest in a very active, wet pattern this weekend. Rain and mountain snow is forecast for much of the western U.S. as a deep upper-level low and associated surface cold front pushes inland. Heavy rainfall is expected for the coastal areas and the nearby mountains, with some locations getting in excess of 4 inches of rainfall by Saturday morning (2/16). The extent of this on

12/11/2024 - 12 PM EST The latest NWS national radar mosaic shows a large swath of rain that stretches from Maine to Florida along and out ahead of a potent cold front. Embedded strong thunderstorms and heavy downpours can lead to localized flooding concerns this afternoon. | NOAA NWS Weather Prediction Center

Combining data from multiple radars and multiple sensors (known as MRMS), we can put together a more complete picture of what kind of precipitation larger scale storms are producing. Looking at an animation of multiple radars over the northeastern U.S. we can see the counterclockwise rotation associated with the low pressure system affecting the area. https://www.nssl.noaa.gov/projects/mrms/ | U.S. National Weather Service (NWS)

Here's a simulated radar evolution through the storm. Precipitation really fills in this afternoon. Watch for rapidly changing conditions! | US National Weather Service Gray ME