The first shortwave trough will reach the Southern California coast on March 5, interacting with residual moisture from a dissipating atmospheric river. This will create brief atmospheric river conditions over much of coastal Southern California, with a high probability of increased moisture transport, according to the Center for Western Weather and Water Extremes (CW3E).
CW3E’s AR Landfall Tool based on GEFS is indicating a high likelihood (>70% probability) of AR conditions over much of coastal Southern California.
While moisture levels are expected to remain moderate, the south-southwesterly flow could enhance precipitation over the Transverse Ranges…