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Hurricane Aletta approaches Mexico as day breaks. Data: RAMMB / CIRA; GIF: Harry Stevens/Axios

Just days after President Donald Trump's hurricane forecast briefing, a rapidly intensifying major hurricane has formed in the Eastern Pacific Ocean.

The details: The storm, Hurricane Aletta, intensified from a Category 1 to a Category 4 storm — with maximum sustained winds of 140 miles per hour — in just 18 hours from Thursday into Friday morning. Such storms are classified as "major hurricanes" once they hit Category 3 intensity or greater.

Why this matters: The storm is not expected to be a threat to land, but it's rapid rate of intensification is of interest to hurricane researchers. As global ocean temperatures increase in response to climate change, there are some indications that rapidly intensifying storms will become more common.

  • In general, meteorologists have less skill in predicting a storm's intensity compared to its upcoming track. What makes one storm ramp up in intensity, while another one sputters despite similar background conditions, is still a mystery.

Why you'll hear more about this: Hurricane season in the Atlantic and eastern Pacific Ocean has only just begun — starting June 1 and running through Nov. 30. According to the National Oceanic and Atmospheric Administration, the eastern Pacific hurricane season is likely to see near-normal or above-normal storm activity, with just a 20% chance of a below normal season.

Read more about the 2018 hurricane season.

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Brazil begins distributing AstraZeneca coronavirus vaccine

Containers carrying doses of the Oxford/AstraZeneca vaccine arrive in Brazil. Photo: Maurio Pimentel/AFP via Getty Images

Brazil on Saturday began distributing the 2 million doses of the AstraZeneca coronavirus vaccine that arrived from India Friday, Reuters reports.

Why it matters: Brazil has the third highest COVID-19 case-count in the world, according to Johns Hopkins University data. The 2 million doses "only scratch the surface of the shortfall," Brazilian public health experts told the AP.

Sullivan speaks with Israel's national security adviser for the first time

Israeli national security adviser Meir Ben Shabbat U.S. Photo: Mazen Mahdi/Getty Images. U.S. national security adviser Jake Sullivan. Photo: Chandan Khanna/Getty Images

U.S. national security adviser Jake Sullivan spoke on the phone Saturday with his Israeli counterpart Meir Ben Shabbat, Israeli officials tell Axios.

Why it matters: This is the first contact between the Biden White House and Israeli prime minister's office. During the transition, the Biden team refrained from speaking to foreign governments.

Biden speaks to Mexican president about reversing Trump's "draconian immigration policies"

Mexican President Andrés Manuel López Obrador. Ismael Rosas/Eyepix Group/Barcroft Media via Getty Images

President Biden told his Mexican counterpart, Andrés Manuel López Obrador, on a phone call Friday that he plans to reverse former President Trump’s “draconian immigration policies.”

The big picture: The Biden administration has already started repealing several of Trump’s immigration policies, including ordering a 100-day freeze on deporting many unauthorized immigrants, halting work on the southern border wall, and reversing plans to exclude undocumented people from being included in the 2020 census.