Entrance Region - The region upstream from a wind speed maximum in a jet stream (jet max), in which air is approaching (entering) the region of maximum winds, and therefore is accelerating.
entrance region - The region of confluence at the upwind extremity of a jet stream; the opposite of exit region.
ENTRANCE REGION- Region of a trough or jet streak where the winds enter the feature. This is the upstream region from the trough axis or jet streak center.
ENUF- Enough ...
Left Entrance Region
(or Left Rear Quadrant) The area upstream from and to the left of an upper-level jet max (as would be viewed looking along the direction of flow).
Right Entrance Region
Used interchangably with Right Rear Quadrant; the area upstream from and to the right of an upper-level jet max (as would be viewed looking along the direction of flow).
See also entrance region, right rear quadrant. Left Front QuadrantUsed interchangably with Left Exit Region; the area downstream from and to the left of an upper-level jet max (as would be viewed looking along the direction of flow).
This divergence results in upward motion of air in the right rear quadrant (or right entrance region) of the jet max. Severe weather potential sometimes increases in this area as a result. See also exit region, left exit region.
Quadrant
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: ALQDS, Entrance Region, Exit Region, Left Exit Region, Left Front Quadrant, Right Entrance Region, Right Rear Quadrant, RRQ
Also listed in ...
Notice how pressures have risen below the north entrance region, and fallen below the north exit region. This will intensify cyclones which tend to be located below the north exit quadrant.
jet streaks ...
and to the right of an upper-level jet max (as would be viewed looking along the direction of flow). Upward motion and severe thunderstorm potential sometimes are increased in this area relative to the wind seed maximum. See also entrance region, ...
 See also: Air, Exit Region, Weather, Cyclone, Temperature
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