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Jet stream *The jet stream is a river of air with segments of higher speed winds embedded within the mean flow *Areas North of jet stream tend to have cooler than normal temperatures especially in the mid-latitudes *Areas South of jet stream tend to have warmer than normal temperatures, especially in higher latitudes Jet Streaks *Rising air occurs in the right rear and left front quadrants of jets *Sinking air occurs in the left rear and right front quadrants of jets *Rising air occurs north of jet axis if jet is in a highly curved flow *Winds over 120 miles per hour constitute a significant jet streak *Upper level divergence enhances rising air, especially if warm air advection is occurring in lower levels of atmosphere |