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: : Synoptic Conditions : :

Synoptical Systems that Affect Panama

Eastern flow perturbations

These tropical perturbations are produced in the summer, generally they doesn't affect us directly, however they produce abundant precipitations over the mountain areas by orographic effects.

Intertropical convergence zone

Is the confluence of trade winds from the northern and southern hemispheres. This confluence is represented by a cloudy strip known as: Intertropical convergence zone (ITCZ). This zone is directly associated with the country's rainy season. The rain produced by ITCZ that affect both coastlines are abundand and continuous, usually present electric storms. These rains can occur at day or night or in the early morning.

High presure systems

In these systems you can detect large areas where the atmospheric pressure is higher in its center and decreases while it moves away of its center. In these systems the wind converges in the upper part and in the lower part diverges, the descendant movement in these systems produce a stable atmosphere with the absence of clouds, and fairly good time. In Panama the high pressure flow peripheral influence allows the sea humidity transport towards the continent, this transport causes orographic showers, mainly over the San Blas mountain range.

Low pressure systems

To the contrary of the high pressure systems, the low pressure systems are asociated with bad weather, they interact with the ITCZ, they are associated to the cloud formation and precipitations through its rising air flow and the instability of the atmosphere.

They are usually known as cyclones and can cause external atmospheric conditions.

El Niño

Recurrent Phenomenon which prescence can be expected between 2 and 7 years. This phenomenton affects the Planet Earth. In Panama, in the Pacific Sector, it produces an extension of the dry season with a deficit in the precipitation levels of up to 50%. This produces a big drought that affects the productive, the agricultural and energetic sectors.

Local Effects

The daytime warning of the continental surface, and the humidity transport from the sea, causes a strong convection over the near coastal zones, causing convection showers accompanied by strong electrical storms, specially in the afternoon. (Sea Breezes, land breezes)

Height Stream Bed

Perturbation in the western flow in high levels, that projects towards inferior levels, causing instabilitym and activating the Pacific convergence.

Systems Incursions

Frontal system displacement under the 20 degrees north, that cause abundant rains over Bocas del Toro and highlands in Chiriqui, and some even cause storms in January in the Pacific coast.

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