The equatorward migration of the subtropical ridge during the cold season is due to increasing north-south temperature differences between the poles and tropics.

This is because more recently reconnected field lines are always closer to the open/closed field line boundary which lies at the equatorward edge of the cusp.

In particular, the barrier layer is formed in winter season in the equatorward flank of subtropical salinity maxima.

Westerly monsoon winds lie in its equatorward portion while easterly trade winds exist poleward of the trough.

The frontal boundary becomes weaker and surrounds the equatorward portion of the cyclone, waiting for the next upper level disturbance to form a new low pressure area.

The initial is caused by the poleward portion of a split upper level trough, with the damming preceding the arrival of the more equatorward portion.

However, the Oyashio Current also causes Vladivostok to be the most equatorward port to seasonally freeze and require icebreaking ships to remain open in winter.

South of Cap Blanc, upwelling is limited to winter and spring due to the northward migration of the Azores high during summer, which is responsible for driving equatorward winds.

The origins of Julia trace back to a vigorous tropical wave, or an equatorward low-pressure area, which emerged into the Atlantic along the western coast of Africa on September 11.

A strengthening or equatorward movement in the subtropical ridge can cause a strengthening of a monsoon trough as a wind surge moves towards the location of the monsoon trough.

The westerly winds on the equatorward portion of the cyclone pull slightly towards the equator, but, because the Coriolis effect weakens toward the equator, the net drag on the cyclone is poleward.

Warm fronts are at the trailing edge of the temperature increase, which is located on the equatorward edge of the gradient in isotherms, and lie within broader troughs of low pressure than cold fronts.

Tropical systems, while generally located within 20 degrees of the equator, are steered primarily westward by the east-to-west trade winds on the equatorward side of the subtropical ridge-a persistent high-pressure area over the world's oceans.

All tropical waves form in the easterly flow along the equatorward side of the subtropical ridge or belt of high pressure which lies north and south of the Intertropical Convergence Zone (ITCZ).

Cold fronts are closely associated with low pressure systems, normally lying at the leading edge of high-pressure systems and, in the case of the polar front, at approximately the equatorward edge of the high-level polar jet.

As the equatorward portion of the system approaches the cold air wedge, persistent low cloudiness, such as stratus, and precipitation such as drizzle develop, which can linger for long periods of time; as long as ten days.

Thunderstorm activity, or convection, within the band is dependent upon the season, as the more equatorward portion is most active in the Southern Hemisphere summer, and the more poleward portion is most active during transition seasons of fall and spring.

Between 30 N and 30 S latitude, this energy transport is accomplished by a relatively simple overturning circulation, with rising motion near the equator, poleward motion near the tropopause, sinking motion in the subtropics, and an equatorward return flow near the surface.

Rainfall is however less heavy than in most parts of mainland Japan since the island is too far south to be influenced by the Aleutian Low and too far from Asia to receive monsoonal rainfall or orographic precipitation on the equatorward side of the Siberian High.

The weather on Shemya is very drastic, though the temperatures only vary between single digits to the mid fifties, and the climate is perhaps the most equatorward low-altitude occurrence of a polar climate (ET) in the world, though it is extremely close to a subpolar oceanic climate (Cfc).