Tag Archives: polar air mass

West Coast warning: Atmospheric River and a Bomb Cyclone look to bring high winds and tons of rain between the Bay area and Eureka, California

Important Takeaways:

  • What happens when an atmospheric river and a “bomb cyclone” happen at the same time? Unfortunately, millions of people living on the west coast are about to find out.  Extremely high winds, massive amounts of rain, and blizzard conditions in the mountains are being forecast for the days ahead, but nobody is quite sure exactly how this extremely unusual weather event is going to play out.
  • It is very rare for an atmospheric river and a “bomb cyclone” to occur simultaneously, but that is precisely what we are witnessing…
    • The arrival of an atmospheric river – a long, narrow band of heavy moisture from the tropics – coincides with conditions in the Pacific where a polar air mass collides with a tropical air mass, causing the atmospheric pressure to drop quickly. Meteorologists call such low-pressure systems a bomb cyclogenesis, bombogenesis, or a bomb cyclone, which intensifies the storm and increases its winds.
  • It would be bad enough to be facing an atmospheric river and a “bomb cyclone” at the same time, but it turns out that both of them are also immensely powerful.
  • According to meteorologist Ryan Maue, this is a “Category 5 atmospheric river”, and the central pressure of the “bomb cyclone” will drop so low that it will be “similar” to a Category 4 hurricane…
    • A massive “bomb cyclone” is set to explode off the U.S. West Coast with hurricane force winds, flooding rains, and enormous mountain snow from Category 5 atmospheric river.
    • Central pressure will fall almost 70 mb / 24 hours reaching 942 mb — similar to Category 4 hurricane.
  • Ryan Maue is a very highly respected meteorologist, and I have no reason to doubt what he is saying.
  • He is also telling us that approximately 20 trillion gallons of moisture will be dumped on the U.S. over the next week…
  • According to Accuweather, it is being projected that the central pressure of the “bomb cyclone” will “crash from 29.53 inches (1000 mb) to at least 28.05 inches (950 mb) in 24 hours”…
    • The storm will strengthen so fast that it will fit into a special category of weather terminology known as a bomb cyclone. A storm, or cyclone, is essentially a giant spinning vacuum in the atmosphere. When a storm’s central pressure drops 0.71 of an inch of mercury inches (24 millibars) or more in 24 hours or less, it is considered to be a bomb cyclone.
    • “This storm’s central pressure is forecast to crash from 29.53 inches (1000 mb) to at least 28.05 inches (950 mb) in 24 hours, which is double the criteria for a bomb cyclone,” AccuWeather Senior Meteorologist Heather Zehr said.
  • We are being told that the hardest hit areas along the west coast will be “between the San Francisco Bay area and Eureka, California”…
  • A blizzard warning has been issued for the Cascade mountains outside of Seattle…
  • I think that this storm has the potential to do an enormous amount of economic damage.

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Rio’s homeless brave unprecedented cold

RIO DE JANEIRO (Reuters) -As an unusual cold snap stuns residents of Rio de Janeiro, a Brazilian city famous for its sun, sand and sea, the city’s homeless have been struggling to sleep through the chill.

“It’s very cold. Even with two blankets and a quilt, I still felt horrible last night,” Flávio, who is homeless, said.

A polar air mass has been traveling toward the country’s center-south regions this week, bringing fast winds and rare snowfall to communities unfamiliar with low temperatures — and to street residents ill-equipped to handle them.

In Rio, Jeniffer Faria da Silva and Marlon Lemos Mollulo have been distributing warm food, blankets, clothes, shoes and bread to the city’s street residents as part of a project they began a year and a half ago. Traveling through the city at night, they’ve been placing thermal liners on concrete, where dozens of the city’s homeless sleep side by side to stay warm.

“There’s a lot of suffering, especially in Rio where we aren’t used to having these kinds of temperatures. We don’t have the right infrastructure to cope with the cold, and some of these people also have pets,” Silva said.

The polar air mass is slated to bring freezing temperatures to São Paulo and Minas Gerais, major producers of key commodities like sugar, citrus and coffee.

Temperatures in Rio are expected to drop to an unusual low of 9°C on Friday before gradually starting to warm up in August.

(Reporting by Sergio Queiroz, writing by Jimin Kang, Editing by Nick Zieminski)

Coffee, cane and orange crops at risk as temperatures plunge in Brazil

By Ana Mano

SAO PAULO (Reuters) -Temperatures fell in swathes of Brazil on Thursday – with rare snowfall overnight in some places – as a polar air mass advanced toward the center-south of the global agricultural powerhouse, threatening coffee, sugarcane and orange crops with frosts.

Unusually cold weather in Brazil has already sent international prices for coffee and sugar higher and Friday was forecast to be the coldest day of the year, according to Marco Antonio dos Santos, a partner at weather consultancy firm Rural Clima.

In a report on Thursday, dos Santos said the south of Goiás and the south of Mato Grosso do Sul, states where farmers grow crops like corn, would face cold temperatures on Friday as the wave of cold air marched northwards.

“With the polar air mass strengthening, it is getting even colder in most of the agricultural producing regions of center-south Brazil,” Santos said. “As such, the chances of frosts in coffee, sugarcane and orange areas increased dramatically.”

In Brazil’s southernmost state of Rio Grande do Sul, the cold wave has brought snow and cold rains to at least 13 cities on Wednesday.

Local television images showed tourists and locals taking photos and playing in the snow in the town of Sao Francisco de Paula as temperatures fell below zero.

The polar air mass should move over Sao Paulo and Minas Gerais, major producers of sugar, citrus and coffee, on Friday, bringing freezing temperatures.

The extreme weather sparked concerns in global markets of a weak harvest in Brazil, which is a major exporter of agricultural commodities.

Raw sugar futures on ICE hit a five month high on Thursday as investors continued pricing in the effects of the cold front in the world’s largest producer.

Agriculture federation FAESP in the main sugar belt Sao Paulo state said last week frosts had already hit 15% to 30% of the cane crop, which will probably lead to lower production.

Indian traders for the first time have signed sugar export contracts five months ahead of shipments as a likely drop in Brazil’s production prompted buyers to secure supplies in advance.

Arabica coffee prices touched a nearly seven-year high earlier this week as the unusual cold weather affected the crop in Brazil, the world’s top producer, with companies poised to pass on higher costs to consumers.

Preliminary estimates from the Brazilian government indicated last week’s frosts alone had affected 150,000 to 200,000 hectares (370,000-490,000 acres), about 11% of the country’s total arabica crop area.

“No one really knows the depth of damage undertaken,” said coffee exporter Comexim, which estimated a 13% loss on next year’s production at the Cerrado region in top coffee growing state Minas Gerais.

Brazil’s second corn crop, which represents 70% to 75% of production in a given year, has suffered from drought and the ill-timed frost as farmers began to harvest it. Corn is a key ingredient for livestock feed.

The state of Parana, Brazil’s number 2 grains producer, cut its projection for the second corn crop by nearly 40% on Thursday to 6.1 million tonnes.

The situation led global grain traders to exit their export contracts using washout clauses, sharply reducing Brazil’s export prospects this year and increasing the need to raise corn imports.

Wheat is also at risk from frosts as around a third of crops in Parana, the largest Brazilian producer, is at a development stage prone to damage from cold.

(Reporting by Ana Mano; additional reporting by Marcelo Teixeira in New York;Editing by Daniel Flynn and Marguerita Choy)