Phoenix could hit 111°F Friday under an Extreme Heat Warning, then trade some heat for a much greater storm threat Sunday and Monday.

Seattle should warm to 72 degrees Friday before rain arrives after dark. Saturday looks cooler and showery, with a small chance of thunderstorms.

State testing found cyanobacteria drifting beyond the lagoon as researchers warn the toxic bloom could preview the next 20 years.

Lowell could reach the Central Pacific as a hurricane by Monday, just as Kaʻū's washed-out Route 11 remains Hawaiʻi Island's only lifeline.

Mayor Quinton Lucas says the airport's 500-megawatt solar plan, once pitched to power a third of KC homes, has no restart date.

A mild Friday is the last easy day before Kansas City heads into a week of upper-90s heat. Sunday could reach 98 degrees.

State regulators say a chlorinated main break wiped out fish just upstream of Whitecliff Park last July, and Missouri American Water has now settled with the state.

Las Vegas faces a final 108-degree heat day Friday before cooler temperatures and gusty winds arrive this weekend.

Friday will be sunny and seasonable in St. Louis, but near-100-degree heat is building for next week.

A possible gustnado spun up near Dripping Springs as storms toppled tree limbs in South Austin Thursday evening.

A clear Friday gives Louisville one easy weather day before a run of mid-90s heat arrives next week.

Greenville starts Friday partly cloudy and warm before afternoon thunderstorms arrive. Next week brings mostly sunny skies, highs in the mid-90s and dangerous heat-index readings.

Brief showers may give way to sunshine Friday, but gusty winds and a Red Flag Warning south of San Francisco are changing the weekend mood.