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Spatial distribution of the WRF stratospheric tracer at 500 hPa at (A) 1200 hours PST on April 27, (B) 0000 hours PST on April 29, (C) 0000 hours PST on April 30, (D) 1600 hours PST on May 2, (E) 0000 hours PST on May 4, and (F) 1400 hours PST on May 5 (all 2014). The black stars indicate the location of San Diego.
