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<br /> <br />, -I <br />'~'r <br />! <br /> <br />Bn-a <br /> <br /> <br />" <br /> <br /> <br />.. <br /> <br />;. .... <br /> <br />~~. ~ <br />~ / "" \, . <br />- _/ "~-~ <br /> <br />OB, <br /> <br />, <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Figure 27. Schematic diagrams of weather types. Heavy lines with arrows at ends indicate upper-level mean <br />flow. Hatched areas are regions of persistent subtropical or polar high pressure at the surface. <br />Stippled areas are quasi-stationary low-pressure centers. Open arrows indicate the paths of polar <br />outbreaks. (From: Elliot, R. D. 1951. Extended range weather forecasting by weather types. <br />In Compendium of Meteorology. American Meteorological Society.) <br /> <br />60 <br />