Napa Weather Forecasts

The moon generated a surprisingly intense magnetic field until at least 3.56 billion years ago, 160 million years longer than previously thought, a new study reports.

A new stem cell discovery has reawakened controversy about human cloning — though technical challenges mean scientists are far from being able to create human babies as in Michael Bay's 2005 sci-fi flick "The Island."

Sometimes, numbers are the only way to tell the true tale of a disaster incomprehensible in scale and indescribable in words. For the victims of Hurricane Sandy, those numbers paint a bleak picture. The storm is estimated to have caused between $50 …

SANTA CLARITA, Calif. (AP) — As firefighters took on a stubborn 3-day-old wildfire Friday in rough terrain north of Los Angeles, a second and more serious blaze broke out 30 miles away near Interstate 5, quickly surging to more than 500 acres, briefly threatening an elementary school and leading to the precautionary evacuation …

Harlequin ladybirds carry a parasite that does not kill them--but does kill other ladybug species that attempt to eat the harlequin progeny. Sophie Bushwick reports.

A huge explosion on the sun will deal Earth a glancing blow today (May 17) but should not pose a threat to the planet, scientists say.

By Jana J. Pruet GRANBURY, Texas (Reuters) - All seven of the people listed missing after a monster tornado on Wednesday have now been accounted for in Granbury, Texas, leaving the death toll at six, authorities said on Friday. Workers were clearing debris to allow residents of the most damaged areas to return to see the …

The moon has a new hole on its surface thanks to a boulder that slammed into it in March, creating the biggest explosion scientists have seen on the moon since they started monitoring it.

Spring sprung early in 2012, breaking records across the lower 48 states, a new study finds.

GRANBURY, Texas (AP) — Raul Rodriguez counts himself a lucky man.

The news that researchers have used cloning to make human embryos for the purpose of producing stem cells may have some people wondering if it would ever be possible to clone a person.

The peak period for baby-making sex in ancient Egypt was in July and August, when the weather was at its hottest.

An Atlas 5 rocket successfully powered a replacement Global Positioning System satellite into space Wednesday to bolster the navigation utility for military and civil users around the world.

MADISON, Wis. (AP) — Bob Gotelaere thought he could outrace the wildfire bearing down on his northwestern Wisconsin home.

A prehistoric shoreline runs along the eastern edge of North America; scientists have pointed to it as evidence that much of Antarctica melted 3 million years ago. But new research suggests this shoreline is actually about 30 feet (10 meters) lower than previously thought, meaning less ice melted than suspected.

Three consumer smartphones that were sent into orbit around Earth last month snapped some incredible photos of our planet from space.

The world's glaciers lost 260 gigatons of water each year between 2003 and 2009, making these rivers of ice responsible for almost a third of sea-level rise in that time, new research finds.

Some estimates put the planet on a pace to lose half of all species by the end of the century, and accordingly, conservation efforts in the United States have moved far beyond not shooting animals.