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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The pattern identified here as B-1 (figures, 10 and 11) is characterized by the <br />presence of a closed-circulation, polar (cold) air mass over western Canada <br />which renains quasi-stationary. Short-amplitude low pressure waves move from <br />the northwest around the closed ci rcu1ation, pa ssi ng th rough Ari zona, 1 eadi ng <br />to a 1-2 day intermittent precipitation eVE!nt. Near the surface, high <br />pressure moves southeastward from western Canada pushing a cold front south- <br />ward tCFfiard southern Arizona. Precipitation generally varies from small to <br />moderate amounts. <br /> <br />- 2~l c. <br />... <br />... <br /> <br /> <br />Figure 10. - Height contour pattern at the 500 millibar pressure level for <br />wave type B-1 <br /> <br />23 <br />