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Supermoon Lunar Eclipse: Brasilia, Asuncion Among Best Sites in South America to View the Rare Celestial Event

The weather will provide northeastern Brazil and central South America with the best viewing conditions across the continent for Sunday night's rare supermoon lunar eclipse.

All of South America has an opportunity to enjoy Sunday night's entire lunar eclipse. That would be if the weather would cooperate, which will not be the case for all.

"The trouble areas will be from southeastern Brazil into Peru," stated AccuWeather Senior Meteorologist Rob Miller. "This includes Sao Paulo, Brazil."

Clouds, showers and thunderstorms occurring along a frontal boundary threaten to spoil the show within this zone. Some of these clouds may also streak across Rio de Janeiro and Belo Horizonte.

Ahead of the storminess, Miller states that Brasilia, Salvador and the rest of northeastern Brazil will have excellent viewing conditions.

A sweep of dry air following the front will lead to clear conditions in much of Bolivia, southern Paraguay, northern Argentina and northern Chile (away from the coast). This is good news for sky gazers in Asuncion, Paraguay, and Cordoba, Argentina.

Along the northern coast of Chile and southern Peru, Miller stated that low clouds will interfere with those hoping to catch the eclipse.

"For Buenos Aires, viewing conditions will not be favorable if not from rain but from clouds with a front coming up from the south," said Miller.

Sky cover will be less than ideal for sky gazers around Santiago as clouds from this same system also occasionally stream overhead. To the south, too many clouds will ruin the show.

Meanwhile, how well those from around Manaus, Brazil, to Venezuela and French Guiana will be able to see the eclipse will depend on how quick daytime clouds and spotty thunderstorms dissipate in the evening. Clouds are likely not to depart Ecuador and most of Colombia.

Where the lunar eclipse is visible, there will be plenty of opportunity for residents to gaze at the moon and to snap pictures.

"The moon will be fully eclipsed for a little more than one hour," stated AccuWeather Meteorologist and Astronomy Blogger Dave Samuhel. "But the time from the very start to the very end of the eclipse will be a little more than three hours."

According to Samuhel, a partial phase of the eclipse will begin at 10:07 p.m. local time for Buenos Aires, Rio de Janeiro and Santiago. The time of the greatest eclipse is expected at 12:23 a.m. Monday before the entire eclipse ends at 1:27 a.m.

What makes Sunday night's lunar eclipse rare is that it is coinciding with a supermoon, which Samuhel says has not happened since 1982. This will also be the closest supermoon of 2015.

Watch below for Slooh's live broadcast of the event set to start at 9 p.m. BRT/7 p.m. COT:

A moon that is in the new or full stage when it makes its closest approach to Earth (known as lunar perigee) is defined as a supermoon.

"There will not be another supermoon eclipse until 2033 and the last total lunar eclipse anywhere across the Earth until 2018," Samuhel said.

Sunday night's supermoon will take on a red tint across its surface when it passes behind the Earth into its shadow.

"The red portion of sunlight is what makes it through our atmosphere to the other side, bent toward the eclipsed moon, so that even though the moon is within Earth's shadow, the red portion of the sun's light can give the moon this ghostly illumination," Eric Edelman of Slooh told AccuWeather.