San Francisco Weather Forecasts

Astronaut Chris Hadfield, the planet's most popular space shutterbug, snapped a spectacular photo of Italy's Mount Etna volcano streaming ash toward the sea early this morning (Feb. 28).

WASHINGTON (Reuters) - As U.S. oil and natural gas production booms, the Obama administration's energy policy has been "fluid" by necessity to adapt to the huge economic opportunities and climate challenges posed by growth, the top White House energy and climate adviser said on Wednesday. In a speech to a room packed with …

DENVER (AP) — A snowstorm moving across the Midwest forced about 60 students to spend the night at their Colorado school when a state highway was closed due to dangerous conditions that left some drivers stranded in their cars, as winter weather continued to cause problems for a wide swath of the country.

CHICAGO (AP) — A slow-moving storm that has paralyzed parts of the nation's midsection for days with heavy, wet snow that strained power lines, clogged roadways and delayed hundreds of flights, dumped at least 6 inches of snow on western Michigan early Wednesday as it churned eastward.

CHICAGO (Reuters) - A powerful winter storm that buried the U.S. Plains moved on Tuesday into the southern Great Lakes region, where it snarled the evening commute in Chicago and Milwaukee, created near-whiteout conditions and forced hundreds of flight cancellations. Wind gusts of up to 35 miles per hour (56 km per hour) …

NORFOLK, Virginia (Reuters) - The signs of rising water are everywhere in this seaport city: yellow "Streets May Flood" notices are common at highway underpasses, in low-lying neighborhoods and along the sprawling waterfront. Built at sea level on reclaimed wetland, Norfolk has faced floods throughout its 400-year history. …

From birds to crustaceans, numerous animal species migrate each year to find more food, pleasant weather or the perfect place to breed. But at least one species — a freshwater fish called the common roach — migrates to avoid getting eaten, new research suggests.

Those who live around the Great Lakes are very familiar with the snow those bodies of water can bring, a phenomenon called lake-effect snow. But a new study suggests that lakesaren'talways the only feature behind the falling flakes.

ST. LOUIS (AP) — The blanket of snow covering much of the Great Plains after two big storms in less than a week may provide some relief for parched areas, but it's no "drought-buster," experts said Tuesday.

The coast of the northeast United States is silhouetted against the shimmering water of Cape Cod Bay and Long Island Sound in a new photo captured by astronauts on the International Space Station.

SYDNEY (Reuters) - Elephant seals wearing head sensors and swimming deep beneath Antarctic ice have helped scientists better understand how the ocean's coldest, deepest waters are formed, providing vital clues to understanding its role in the world's climate. The tagged seals, along with sophisticated satellite data and …

KANSAS CITY, Mo. (AP) — The second major snowstorm in a week battered the nation's midsection Tuesday, dropping up to a foot or more of heavy, wet snow that strained power lines and cut electricity to more than 100,000 Midwesterners. At least three deaths were blamed on the blizzard. Gusting winds blew drifts more than …

Stormwater runoff can quickly drain a homeowner's wallet. The flooding erodes yards, soaks basements, pollutes streams and wastes a precious resource.