Brief Communication: Differences between Sundowner and Santa
Ana wind regimes in the Santa Ynez Mountains, California
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Abstract. Strong afternoon downslope Sundowner winds in southern California's Santa Ynez Mountains favor wildfire growth. To determine whether Sundowners are different from Santa Ana winds (SAW), we use surface observations from 1979–2014 to develop a climatology of extreme Sundowner days. The climatology was compared against an existing SAW index from 1979–2012. Sundowner occurrence peaks in late spring whereas SAWs peak during winter. SAWs demonstrate amplified 500 hPa geopotential heights over western North America and strong anomalously positive inland mean sea level pressures. In contrast, Sundowner-only conditions occur during zonal 500 hPa flow and moderate negative inland sea level pressure anomalies.
2018 ◽
Vol 18
(2)
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pp. 419-427
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2013 ◽
Vol 28
(3)
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pp. 704-710
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2002 ◽
Vol 22
(9)
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pp. 1119-1142
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Nonseasonal variability of monthly mean sea level pressure and precipitation variability over Europe
2000 ◽
Vol 25
(2)
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pp. 177-181
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1985 ◽
Vol 63
(2)
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pp. 201-209
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2008 ◽
Vol 13
(6)
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pp. 449-460
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