The original weather signal flags included a red circle, crescent, and star for warmer, cooler, and steady temperatures, respectively. A blue circle, crescent, and star indicated general rain or snow, ...

NOAA’s effort to recapitalize its aging fleet of research ships took a major step forward today with the U.S. Navy’s award of a $178,082,877 contract to Thoma-Sea Marine Constructors LLC, Houma, ...

Harmful algal blooms, or HABs, occur when colonies of algae — simple plants that live in the sea and freshwater — grow out of control and produce toxic or harmful effects on people, fish, shellfish, ...

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NOAA’s 1991-2020 U.S. Climate Normals provide averages for climate variables like temperature and precipitation. This Explainer explores what Climate Normals are, why NOAA produces them, what changes ...

A NOAA analysis released today finds significantly higher rainfall frequency values in parts of Texas, redefining the amount of rainfall it takes to qualify as a 100-year or 1000-year event. The study ...

Most flash floods are caused by slow moving thunderstorms, thunderstorms that move repeatedly over the same area or heavy rains from tropical storms and hurricanes. These floods can develop within ...

NOAA’s National Marine Fisheries Service today announced an advance notice of proposed rulemaking requesting information that could help modernize regulations designed to reduce the risk of lethal ...

NOAA-supported scientists announced today that this year’s Gulf of America “dead zone” — an area of low to no oxygen that can kill fish and marine life — is approximately 4,402 square miles, 21% ...

Although the eye of Hurricane Erin was never closer than about 200 miles from the U.S. East Coast and its center never made landfall, Erin’s effects were still seen along the shoreline and felt by ...

It’s that time of year to watch out for one of the most dangerous and underplayed winter hazards while on the road: Snow squalls. A snow squall is a brief period of intense snowfall and wind that ...

The tornadoes that ripped across the central and southern U.S. late in the evening of December 10, 2021, were notable in many ways. The thunderstorms and tornadoes they produced traveled far — ...