CW3E Event Summary: 9-13 March 2020
March 17, 2020
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Cutoff low and landfalling AR bring heavy rainfall to the southwestern U.S.
- A quasi-stationary cutoff low interacted with a region of tropical moisture over the Eastern Pacific Ocean, resulting in a long-duration atmospheric river (AR) over the Baja Peninsula
- Poleward moisture transport and strong synoptic-dynamic forcing for ascent produced multiple episodes of heavy rainfall across Southern California, Arizona, and southern Nevada
- Elevated sections of Southern California and central Arizona received 3–6 inches of total precipitation, with 1–3 inches at lower elevations
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Valid 0000 UTC 9 March – 0000 UTC 14 March 2020
Summary provided by C. Castellano and F. M. Ralph; 17 March 2020