Smoke from large wildfires in Canada has crossed the Atlantic and reached Europe, scientists announced on Tuesday. More smoke clouds will hit the continent in the coming days, according to the EU ...

The ceilometer is a scientific tool of observation used by airports daily. It informs aircraft pilots of cloud heights and bases for safe takeoff and landing. In recent years, scientists have found a ...

Early risers in Texas saw something a little bit unusual earlier this week. A rare display of “meteor smoke clouds” — technically called noctilucent clouds — was rippling overhead before sunrise on ...

Much of Southern California remained under a red flag warning for extreme fire risk due to strong, dry winds. The number of people under evacuation orders was not specified. About 18,600 people live ...

The lack of humidity we’ve been enjoying the past few days is going to stick around throughout the rest of the day. With temperatures in the upper 70s, things are going to be very comfortable once ...

The next time authorities issue a smoke advisory telling residents of California areas previously unaffected by wildfires to stay inside with closed windows and doors until a smoke cloud passes by or ...

A new NASA-led study helps answer decades-old questions about the role of smoke and human-caused air pollution on clouds and rainfall. Looking specifically at deep convective clouds — tall clouds like ...

Fire crews say they have seen modest growth on the east and south edges of the Camp Creek Fire in the Bull Run Watershed. However, they are not able to give an accurate update of acreage as their ...

SAO PAULO (AP) — A major river in the Brazilian metropolis of Sao Paulo is suddenly emerald green and clear skies this week turned from blue to grey. In the late afternoon, the sun’s rays filtering ...

A junkyard fire in Camden, New Jersey, was brought under control more than six hours after it broke out Friday evening, officials said. Smoke from the fire was visible across the region including in ...