Final answer:
Low level jet streams on Earth are commonly found around regions with significant east-west wind patterns, including dry air masses at roughly 30° N and 30° S latitudes. They are also influential in climates affected by major ocean currents like the Gulf Stream, which impacts Western Europe's temperate climate.
Step-by-step explanation:
Geographically, low level jet streams are most common in regions with consistent underlying east-west wind patterns that remain relatively unchanged over long periods. For instance, on Jupiter, there is an eastward-flowing jet stream at the equator reaching speeds similar to Earth's upper atmosphere jet streams, with alternating east-and west- moving streams at higher latitudes. Saturn demonstrates a similar pattern with an even stronger equatorial jet stream.
On Earth, we observe low-level jets contributing to the global pattern of precipitation, as seen with the dry air masses around 30° N and 30° S latitude. The Gulf Stream significantly influences climate, as it does for Western Europe, leading to a temperate climate in northern latitudes impacted by weather systems or storms, which could include jet streams.