Sentences with phrase «tropical waves move»
[8] In the north Atlantic and the northeastern Pacific oceans, tropical waves move along the axis of the ITCZ causing an increase in thunderstorm activity, and under weak vertical wind shear, these clusters of thunderstorms can become tropical cyclones.
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Brian McNoldy, a meteorologist at Colorado State University who maintains a useful Web site on tropical storms in the Atlantic Ocean, has distributed an alert about a particularly noteworthy wave of low pressure moving west from Africa that appears likely to become a hurricane within a week.
It can not account for the huge volume of leftover warm water that's below the surface and returned to the West Pacific and into the eastern tropical Indian Ocean via off - equatorial slow - moving Rossby waves.
Extratropical cyclones have three stages of expansion: the developing stage, in which an undulating wave develops along the front; the mature stage, in which sinking cold air sweeps equatorward west of the surface low - pressure centre and ascending warm air moves poleward east of the cyclone; and the occluded stage, in which the warm air is entrained within and moved above the polar air and becomes separated from the source region of the tropical air.
A tropical wave was along 39 west, south of 20 north, moving west at 10 - 15 knots.
Coincidentally, after a strong East Pacific El Niño, it takes a slow moving Rossby wave about 6 months to return leftover warm water from the eastern to the western tropical Pacific.