Nat. Hazards Earth Syst. Sci., 18, 3037–3043, 2018 https://doi.org/10.5194/nhess-18-3037-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Brief communication: Meteorological and climatological conditions associated with the 9 January 2018 post-fire debris flows in Montecito and Carpinteria, California, USA Nina S. Oakley1,2, Forest Cannon2, Robert Munroe3, Jeremy T. Lancaster4, David Gomberg3, and F. Martin Ralph2 1Western Regional Climate Center, Desert Research Institute, 2215 Raggio Parkway, Reno, Nevada 89512, USA 2Center for Western Weather and Water Extremes, Scripps Institution of Oceanography, 9500 Gilman Dr., La Jolla, CA 92093, USA 3National Weather Service, Oxnard/Los Angeles, 520 N. Elevar St., Oxnard, CA 93030, USA 4California Geological Survey, 801 K St., Sacramento, CA 95814, USA Correspondence: Nina S. Oakley (
[email protected]) Received: 20 June 2018 – Discussion started: 26 June 2018 Revised: 8 October 2018 – Accepted: 25 October 2018 – Published: 19 November 2018 Abstract. The Thomas Fire burned 114 078 ha in Santa rainfall intensity of 24 mm h−1 (USGS, 2018a; Fig. S1 in the Barbara and Ventura counties, southern California, during Supplement). December 2017–January 2018. On 9 January 2018, high- In the first significant rainfall event of the wet season on 9 intensity rainfall occurred over the Thomas Fire burn area January 2018, high-intensity rainfall occurred over the west- in the mountains above the communities of Montecito and ernmost portion of the Thomas Fire burn area between 11:30 Carpinteria, initiating multiple devastating debris flows. The and 12:00 UTC (03:30–04:00 LST).