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<br />Table 7. North American weather type.. <br /> <br />Weather <br />type <br /> <br />A-Ao <br /> <br />B-B8 <br /> <br />Bn-a <br /> <br />Bn-b <br /> <br />Bn-c <br /> <br />C-F <br /> <br />D <br /> <br />Eh <br /> <br />E' <br />J <br /> <br />El <br /> <br />Em <br /> <br />En <br /> <br />Prominent weather feature <br /> <br />Large trough over western U.S. Strong <br />Pacific Ri~ge. <br /> <br />Zonal flow with jet displaced northward. <br />Surface high pressure and weak ridge over <br />western u. s. <br /> <br />Ridge of high pressure over western u.s. <br />and trough over eastern U.S. Strong <br />surface high over Great Basin. <br /> <br />Similar to Bn-a but with polar outbreak <br />east of the Rockies. <br /> <br />Similar to Bn-b except ridge occurs along <br />Pacific' Coast and trough is displaced <br />westward to the Great Plains. Occasion- <br />ally the polar outbreak spreads west of <br />the Rockies. <br /> <br />Split flow with ridge over Pacific North- <br />west and trough over Southwestern U.S. <br /> <br />Strong Pacific <br />Pacific coast. <br />with A-Ao ty.pe. <br /> <br />ridge. Trough off <br />Jet further north <br /> <br />the <br />than <br /> <br />Typical Utah <br />weather <br /> <br />Wet <br /> <br />Most ly dry <br /> <br />Dry <br /> <br />Dry <br /> <br />Cold, sometimes wet <br />in north <br /> <br />Mostly wet, espe- <br />cially south <br /> <br />Wet <br /> <br />Mostly dry <br /> <br />Warm and wet <br /> <br />Wet <br /> <br />Wet <br /> <br />Wet in north <br /> <br />Zona 1 flow <br />than normal. <br />of Rockies. <br /> <br />with jet much further south <br />Very strong polar high east <br />Infrequent occurrence. <br /> <br />Zonal flow with jet from Hawaii to cen- <br />tral California. Infrequent occurrence. <br /> <br />Zonal flow with jet just north of Utah. <br /> <br />Zonal flow with jet over Utah. Frequent <br />wave development over Great Basin. <br /> <br />Zonal flow with jet along <br />der. Similar to B-Bs but <br />high pressure. <br /> <br />Canadian bor- <br />with weaker <br /> <br />27 <br />