South America

Weather Underground Forecast for Saturday, July 04, 2009.

Mexico will continue to see wet weather on Saturday as lower pressure hovers over the country. This will pull moisture onshore from the Pacific Ocean, allowing for moderate to heavy showers and thunderstorms to develop along the west coast, with scattered showers extending into central and eastern Mexico. To the south, a tropical wave will move westward over Costa Rica, Nicaragua, and Honduras, kicking up moderate to heavy storms throughout the day. Onshore flow from the Caribbean over Central America will allow for wet weather to persist from the Yucatan Peninsula into Panama. To the east, a stationary front will extend from a low pressure system off the East Coast of the US and hover over the Gulf on Saturday. This front will trigger scattered showers over the Bahamas and Florida. Expect usual afternoon showers and thunderstorms across the Greater and Lesser Antilles on Saturday.

In South America, wet and humid conditions will persist in the northern countries with moderate to heavy showers and thunderstorms anticipated over Venezuela. To the south, a front will continue moving eastward over Paraguay and southern Brazil, producing wet weather throughout the day with periods of heavy rainfall anticipated in areas of thunderstorm development. Sao Paulo will see light rain with highs in the mid-60s(F)/ upper teens(C), while severe storms are expected in Rio de Janiero with highs reaching into the upper 70s(F)/ mid-20s(C).

Further south, a strong low pressure system will move over Chile on Saturday, bringing much moisture to the region. Expect scattered showers in Santiago with highs near 60(F)/ mid-teens(C), while snow and mixed precipitation will fall at high elevations of southern Chile.