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National Weather Service

The National Weather Service (NWS) is an agency of the United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weather-related products to organizations and the public for the purposes of protection, safety, and general information. It is a part of the National Oceanic and Atmospheric Administration (NOAA) branch of the Department of Commerce, and is headquartered in Silver Spring, Maryland, within the Washington metropolitan area.[6][7] The agency was known as the United States Weather Bureau from 1890 until it adopted its current name in 1970.[8]

"Weather Bureau" redirects here. For other uses, see Meteorological Administration.

Agency overview

February 9, 1870 (1870-02-09)

  • United States Weather Bureau

US$1.204 billion (FY 2021)

The NWS performs its primary task through a collection of national and regional centers, and 122 local Weather Forecast Offices (WFOs). As the NWS is an agency of the U.S. federal government, most of its products are in the public domain and available free of charge.

(Airmen's Meteorological Information) – Information on icing, turbulence, mountain obscuration, low-level wind shear, instrument meteorological conditions, and strong surface winds.

AIRMET

SIGMETs

Provide observational meteorological data, usually consisting of daily maximum and minimum temperatures, snowfall, and 24-hour precipitation totals, required to define the climate of the United States and to help measure long-term climate changes.

Provide observational meteorological data in near real-time to support forecast, warning and other public service programs of the NWS.

Outlook – Hazardous Weather Outlooks are issued daily by individual Weather Forecast Offices to address potentially hazardous weather or hydrologic events that may occur over the next seven days. The outlook will include information about the potential of convective thunderstorm activity (including the potential for severe thunderstorms), heavy rain or , winter weather, and extremes of heat or cold. It is intended to provide information to those who need considerable lead time to prepare for the event, including notification to storm spotter groups and local emergency management agencies on the recommendation of activation during severe weather situations in areas prone to such events. Other outlooks are issued on an event-driven basis, such as the Flood Potential Outlook and Severe Weather Outlook.

flooding

Advisory – An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent, or likely. Advisories are for less serious conditions than warnings, that cause significant inconvenience and if caution is not exercised, could lead to situations that may threaten life or property.

Watch – A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain. It is intended to provide enough lead time so those who need to set their safety plans in motion can do so in advance if a forecasted event should occur. A watch means that hazardous weather is possible, but not imminent. People should have a plan of action in case a storm threatens and monitor various avenues that provide NOAA-disseminated data to listen for later information and possible warnings, especially when planning travel or outdoor activities.

Warning – A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. A warning means weather conditions pose a threat to life or property. People in the path of the storm need to take protective action.

Special Weather Statement (or Significant Weather Advisory) – A special weather statement is issued when something rare or unusual is occurring. These are usually triggered by sudden changes in meteorological conditions. The statements are to be taken as warnings for residents of a specific area. Significant Weather Advisories are often issued for storms not severe enough for Severe Thunderstorm Warnings, but for strong winds and small hail. The warning generally states that an area might be at risk for a slight weather danger, though not all weather statements are warnings. Other times, statements describe informative facts about a weather system (such as local snowfall).

Chief Information Officer

National Centers for Environmental Prediction

Climate Prediction Center

Chief Financial Officer

Operational Systems

Hydrologic Development

Climate, Water and Weather Services

Weather Forecast Offices

(SMG)

Spaceflight Meteorology Group

As of 2016, the National Weather Service was organized as follows[58]

Lack of sufficient computing power to run simulations known to be better (including higher-resolution simulations and "ensemble" forecasts where multiple runs tweak variables slightly to detect low-confidence simulations)

Not using techniques shown to improve accuracy by recent academic research

Not from all available sources, such as TAMDAR data from commercial airliners. (Due to budget cuts, this could not be purchased from Panasonic Weather Solutions on an ongoing basis.)

assimilating data

Lack of updated equipment on weather satellites

Lack of focus on a small number of high-quality models compared to the Met Office and the ECMWF

Integrated Forecast System

Organizational and turf wars

stovepiping

Resistance to change by powerful employee unions

Critics such as University of Washington professor Cliff Mass[63] have claimed that NWS forecasts are not as accurate as they could be, and that this has resulted in inaccurate daily weather forecasts and dangerously bad predictions concerning the location and intensity of extreme weather events like blizzards and hurricanes. In 2016, the British Met Office, the European Centre for Medium-Range Weather Forecasts (ECMWF), and the Northwest Regional Modeling Consortium in Seattle have been cited as producing more accurate predictions in certain circumstances. According to critics, causes include:[64]


The Next Generation Global Prediction System project at NWS [65] aims to address some of these criticisms by running a unified high-quality model that takes advantage of more recent research results. In 2016, the NOAA announced to develop The Next Generation Global Prediction System.[66]

– known for proving the practicality of using a network of coastal radio stations to transmit weather information

Reginald Fessenden

– a Canadian weather forecasting agency operated under Environment Canada, founded in 1876

Meteorological Service of Canada

NOAA's Environmental Real-time Observation Network

Radar Operations Center

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Official website

account of NOAA on USAspending.gov

Operations, Research, and Facilities

National Weather Service Employees Organization (NWSEO)