Pat yourself on the back. You made it to Thursday.

• Today's weather: Hot and sunny with a high of 93.

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U.S. Sen. Marsha Blackburn stomped into the Tennessee governor's race yesterday and quickly assembled an army of support featuring many of the state's top Republicans.

Why it matters: Blackburn is a titan of Tennessee politics and she instantly became the front-runner in the Republican primary field, which also includes U.S. Rep. John Rose.

Flashback: Scuttlebutt surrounding Blackburn's run began late last year when she placed a statewide television ad. Some insiders guessed it would be the announcement that she was running for governor.

• The ad turned out to be Blackburn wishing everyone a merry Christmas.

The intrigue: Even after Axios first reported in January that Blackburn was pondering a run, some insiders were skeptical.

• They viewed a U.S. Senate seat as such a desirable and hard-to-earn job that Blackburn would keep it until the end of her political career.
• Others factored in her loyalty to President Trump, and surmised she would want to help advance his MAGA agenda in the Senate.

In her Trump-heavy announcement video, Blackburn framed her run for governor as an effort to support the MAGA movement at the state level.

Between the lines: The aftermath of Blackburn's announcement underscored her clout in GOP circles.

• U.S. Rep. Chuck Fleischmann, state Sen. Jack Johnson and state Rep. William Lamberth were among the many Republicans who rushed to endorse her.

Zoom in: Knox County Mayor Glenn Jacobs also reiterated his support for Blackburn. Jacobs is viewed as a likely candidate for statewide office, and in an alternate reality he might be entering the race himself instead of backing Blackburn.

• "[Blackburn] has a proven record of defending Tennessee conservative values, and exactly one year from today, I will proudly cast my vote for her to be our 51st Governor," Jacobs posted on X.

Zoom out: Blackburn, 73, has been a familiar face in the Nashville area for years. She's from Brentwood and served as the head of the state film and entertainment commission.

• Blackburn's public persona was forged by the success of the early 2000s fight to bar a state income tax. She served in the state Senate before running for the District 7 U.S. House seat, which she held for 16 years.
• She won her Senate race in 2018 by defeating the popular former Gov. Phil Bredesen in the general. She cruised to reelection last year against one of Tennessee's top Democrats, state Rep. Gloria Johnson.

What we're watching: A viable Democratic candidate has yet to enter the race. With the primary election one year away, now's the time when contenders would pursue a campaign.

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More than 2 in 3 public school students in the Nashville area attend schools in extreme urban heat zones, a new analysis finds.

Why it matters: The heat island effect can make some neighborhoods notably warmer than others, especially during heat waves like the one that recently ravaged the region.

The big picture: About 76% of public K-12 students in the 65 most populous U.S. cities attend schools where the "heat island effect" increases temperatures by at least 8°F, per a new analysis from Climate Central, a climate research group.

• The Nashville area is slightly lower than the national figure, at 69%.

Threat level: Many schools nationally lack adequate air conditioning, jeopardizing students' health and learning abilities in periods of extreme heat while class is in session.

How it works: Heat islands amplify the impact and danger of extreme heat events fueled by human-driven climate change, with the built environment absorbing and trapping heat at the hyperlocal level.

• Urban heat islands are more common in lower-income and non-white neighborhoods, researchers have found.

What's next: Nashville and several other cities are confronting extreme heat through efforts like special pavement coating to reflect the sun's heat instead of absorbing it.

Read the national story

✅ Tennessee State University announced interim president Dwayne Tucker has been promoted to the permanent role. (Tennessean)

❓ Mayor Freddie O'Connell's administration shared his questions about the Boring Company's tunnel project with the Metro Council on Tuesday. (Tennessee Lookout)