Currently en Puerto Rico — 29 de junio, 2023: Aguaceros y tronadas con foco en el este. Riesgo de inundaciones.

El tiempo, currently.

El riesgo de tronadas seguirá siendo alto el jueves debido a la interacción entre una onda tropical, que ha elevado los niveles de humedad atmosférica muy por encima del promedio, y una vaguada en niveles superiores, que desestabilizará la atmósfera hasta el viernes. El foco de los aguaceros y las tronadas más fuertes cambiará desde el noroeste el miércoles hacia el este y el sur el jueves porque las lluvias vendrán esta vez desde las aguas locales. Es probable que haya precipitaciones totales diarias de 1 a 2 pulgadas, con cantidades más altas en áreas locales, particularmente en el este. Inundaciones serán posibles en áreas urbanas, carreteras y quebradas, y también habrá riesgo de inundaciones repentinas aisladas. Afortunadamente, el viernes por la tarde llegará una zona de aire mucho más seco con altas concentraciones de polvo sahariano, lo que promoverá tiempo más despejado y brumoso, pero también caluroso, para el fin de semana.

—John Toohey-Morales

What you can do, currently.

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What you need to know, currently.

Astonishingly record-setting Atlantic Ocean temperatures have helped trigger a record-breaking melting of the Greenland ice sheet surface this week, new data show.

This week’s melt covered more than 50% of the Greenland ice sheet, only the third time that has ever happened since modern records have been kept, and the earliest-ever in the melt season. Above-freezing temperatures were recorded all the way to the top of the enormous ice sheet, more than 10,000 ft (3,300 m) above sea level. Temperatures reached 73°F (23°C) in far northern Greenland due to downsloping dry winds.

The Greenland melt was “certainly an extreme melt event highlighting the climate emergency,” according to Joel Gombiner, a polar scientist at the University of Washington. “The Greenland ice sheet completely melted last time CO2 was this high. The only question is how fast it disappears this time.”

Greenland is warmer now than at any time over at least the past 1,000 years. The melting of the Greenland ice sheet is directly linked to climate change caused by burning fossil fuels, and an acceleration of its melt is one of the tipping points expected if global warming exceeds the 1.5°C target agreed to in the Paris Climate Accord.

—Eric Holthaus