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Map showing a computer model projection of the "misery index" (heat plus humidity) on July 2, 2018. Credit: http://earth.nullschool.net

July is typically the hottest month of the year, for both the U.S. and the planet as a whole. However, this year it is going to start off particularly hot across the country, as a dangerous heat wave stretches from Arizona to Maine.

Why it matters: The heat and humidity will combine to create life-threatening conditions in many cities, particularly in the Midwest and Northeast, where heat advisories and excessive heat warnings are in effect.

The cause: A sprawling and unusually intense area of high pressure aloft, also known as a "heat dome," will promote sinking air and sunny, storm-free conditions for areas under its influence.

  • At the peak of the heat wave between July 1 and the Fourth of July holiday, more than 50% of the lower 48 states are forecast to see high temperatures exceeding 90 degrees Fahrenheit.

The sweaty details: Some cities, including Kansas City, St. Louis, Chicago, Detroit, New York City, Philadelphia, Washington, and Nashville, could all see temperatures reach or exceed 100 degrees Fahrenheit, which is about 10 to 20 degrees above average for this time of year.

Forecast maximum heat index for July 2, 2018. Credit: NOAA
  • In the Northeast, the hottest day is forecast on Sunday, July 1. Even parts of Canada could see temperatures flirt with the century mark that day.
  • The high humidity will make it feel even hotter, with heat indices above 105 degrees Fahrenheit in some places.

Be smart: The heat will be sufficient to break at least daily record highs, as well as set records for the warmest overnight low temperatures. Denver already tied its all-time high temperature record of 105 degrees Fahrenheit on Thursday.

This extreme weather event will also be more noteworthy for its geographical scope and long duration than for its intensity — some locations will see seven-to-10 days straight of 90-degree or above conditions.

The big picture: Climate scientists have shown in multiple peer reviewed studies that heat waves are already becoming more likely and more intense across the globe as the overall climate warms due to rising amounts of greenhouse gases in the air.

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Go deeper

Movie theaters go out of style

Illustration: Sarah Grillo/Axios

Vaccination rates are going up, people are going out to restaurants again — although the new COVID variant may get in the way — but they still aren't rushing back to the movies.

By the numbers: Some 49% of pre-pandemic moviegoers are no longer hitting theaters, according to a study from the film research company The Quorum, as reported by the New York Times.

3 hours ago - Health

Vaccine mandates lose steam in the U.S. while Europe doubles down

Illustration: Sarah Grillo/Axios

European countries are doubling down on pressure campaigns to get people vaccinated just as Republicans continue to wage war — often successfully — against vaccine mandates in the U.S.

Why it matters: The starkly different approaches create a sharp contrast between the regions' approaches to vaccination, even as the Omicron variant rapidly spreads around the world.

4 hours ago - World

Two years of COVID-19

Expand chart
Data: Our World in Data; Chart: Axios Visuals

Two years ago Wednesday, the first case of a mysterious new respiratory disease was discovered in Wuhan, China. Now, the Omicron variant has deepened concerns about just how much longer the coronavirus pandemic will last.

The big picture: More than 5 million people have died since that first case. Most people on earth have lived through some form of lockdown. 54% of the global population has had at least one vaccination, though the shots have been distributed unevenly.

You’ve caught up. Now what?

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