National Weather Service in the context of "Title 15 of the United States Code"

An ice storm, also known as a glaze event or a silver storm, is a type of winter storm characterized by freezing rain. The U.S. National Weather Service defines an ice storm as a storm which results in the accumulation of at least 0.25-inch (6.4 mm) of ice on exposed surfaces. They are generally not violent storms but instead are commonly perceived as gentle rains occurring at temperatures just below freezing.

A cold wave (known in some regions as a cold snap, cold spell, Arctic blast, or Arctic Snap) is a weather phenomenon that is distinguished by a cooling of the air. Specifically, as used by the U.S. National Weather Service, a cold wave is a rapid fall in temperature within a 24-hour period requiring substantially increased protection to agriculture, industry, commerce, and social activities. The precise criteria for a cold wave are the rate at which the temperature falls, and the minimum to which it falls. This minimum temperature is dependent on the geographical region and time of year.

In the United States, a cold spell is defined as the national average high temperature dropping below 20 °F (−7 °C). A cold wave of sufficient magnitude and duration may be classified as a cold air outbreak (CAO).

Television InfraRed Observation Satellite (TIROS) is a series of early weather satellites launched by the United States, beginning with TIROS-1 in 1960. TIROS was the first satellite that was capable of remote sensing of the Earth, enabling scientists to view the Earth from a new perspective: space. The program, promoted by Harry Wexler, proved the usefulness of satellite weather observation, at a time when military reconnaissance satellites were secretly in development or use. TIROS demonstrated at that time that "the key to genius is often simplicity". TIROS is an acronym of "Television InfraRed Observation Satellite" and is also the plural of "tiro" which means "a young soldier, a beginner".

The Advanced Research Projects Agency (now DARPA) initiated the TIROS program in 1958 and transferred the program to the National Aeronautics and Space Administration (NASA) in 1959. Participants in the TIROS program also included, United States Army Signal Research and Development Laboratory, Radio Corporation of America (RCA), the United States Weather Bureau Service, the United States Naval Photographic Interpretation Center (NPIC), the Environmental Science Services Administration (ESSA), and the National Oceanic and Atmospheric Administration (NOAA).

Death Valley (Panamint: Tümpisa [tɨmbiʃa]) is a desert valley in Eastern California, United States, in the northern Mojave Desert, bordering the Great Basin Desert. It is thought to be the hottest place on Earth during summer.

Death Valley's Badwater Basin is the point of lowest elevation in North America, at 282 feet (86 m) below sea level. It is 84.6 miles (136.2 km) east-southeast of Mount Whitney – the highest point in the contiguous United States, with an elevation of 14,505 feet (4,421 m). On the afternoon hours of July 10, 1913, the United States Weather Bureau recorded a temperature of 134 °F (56.7 °C) at Furnace Creek in Death Valley, which stands as the highest ambient air temperature ever recorded on the surface of the Earth. However, this reading and several others taken in that period are disputed by some modern experts.

At sea, a storm warning is a warning issued by the National Weather Service of the United States when winds between 48 and 63 knots (89 and 117 km/h; 55 and 72 mph) are occurring or predicted to occur soon. The winds must not be associated with a tropical cyclone. If the winds are associated with a tropical cyclone, a tropical storm warning will be substituted for the storm warning and less severe gale warning.

In US maritime warning flag systems, a red square flag with a black square taking up the middle ninth of the flag is used to indicate a storm warning (the use of two such flags denotes a hurricane force wind warning or a hurricane warning). The same flag as a storm warning is used to indicate a tropical storm warning.

The Committee on Science, Space, and Technology is a committee of the United States House of Representatives. It has jurisdiction over non-defense federal scientific research and development. More specifically, the committee has complete jurisdiction over the following federal agencies: NASA, NSF, NIST, and the OSTP. The committee also has authority over R&D activities at the Department of Energy, the EPA, FAA, NOAA, the DOT, the NWS, the DHS and the U.S. Fire Administration.

A dry thunderstorm is a thunderstorm that produces thunder and lightning, but where all or most of its precipitation evaporates before reaching the ground. Dry lightning is lightning occurring in this situation. Both are so common in the American West that the terms for them are sometimes used interchangeably.

Dry thunderstorms occur essentially in dry conditions, and their lightning is a major cause of wildfires. Because of that, the United States National Weather Service, and other agencies around the world, issue forecasts for its likelihood over large areas.

A low-water crossing (also known as an Irish bridge or Irish Crossing, causeway in Australia, low-level crossing or low-water bridge) is a low-elevation roadway traversing over a waterbody that stays dry above the water when the flow is low, but is designed to be submerged under high-flow conditions such as floods. This type of crossing is much cheaper to build than a high bridge that keeps the road surface consistently above the highest water level, and is usually deployed in semi-arid areas where high-volume rainfall is rare and the existing channel is shallow (which requires extra ramping on the banks to build a more elevated bridge and thus costs more), particularly in developing countries.

Low-water crossings are essentially elevated floodways, functioning like causeways under normal conditions and serving as limited fords during high-discharge conditions. They are generally considered unsafe for traffic during floods due to the potentially fast and turbulent currents flowing over the road surface, and can be dangerous even after the flood has receded because silt, mud and debris left on the road by the water can reduce traction and cause skidding risks for both vehicles and pedestrians.