This research was funded by the AR Program Phase II, Grant 4600013361, sponsored by the California Department of Water Resources and Forecast Informed Reservoir Operations (FIRO), Grant W912HZ-19-SOI-0027, sponsored by the U.S. Army Corps of Engineers Research and Development Center.
Bulletin of the American Meteorological Society
Atmospherics Rivers -- Analysis
The “Valentine’s Day” atmospheric river (AR) event that affected a majority of California during 13–15 February 2019 ranked as an AR3 (Ralph et al. 2019) along most of the California coast and reached AR4 intensity in Southern California. The strong onshore flow and dynamically favorable characteristics of the Valentine’s Day AR produced both an intense and long-duration precipitation event resulting in widespread hydrometeorological impacts across California. Palomar Observatory in northern San Diego County observed >10 in. (>254 mm) of precipitation in 24 h, the highest 24-h accumulation since record keeping began in 1943 (Hatchet et al. 2020
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Hecht, Chad W.; Michaelis, Allison C.; Martin, Andrew C.; Cordeira, Jason M.; Cannon, Forest; and Ralph, F. Martin, "Illustrating Ensemble Predictability across Scales Associated with the 13–15 February 2019 Atmospheric River Event" (2022). Geography Faculty Publications and Presentations. 235.