14 results. (Showing 1 - 14)

1. NAO Index
This index measures the anomalies in sea level pressure between the Icelandic low pressure system and the Azores high pressure system. When the difference is positive the northeastern United States sees an increase in temperature and a decrease in snow days; the central US has increased precipitation, the North Sea has an increase in storms; and Norway along with Northern Europe has warmer temperatures and increased precipitation. When the difference is negative the Tropical Atlantic and Gulf coast have increased number of strong hurricanes; northern Europe is drier, and Turkey along with other Mediterranean countries has increased precipitation.

2. National Centers for Environmental Prediction (NCEP )
The National Centers for Environmental Prediction (NCEP), an arm of the NOAA's National Weather Service (NWS) provides national and international weather and climate guidance products to National Weather Service field offices, government agencies, emergency managers, private sector meteorologists, and meteorological organizations and societies throughout the world. The nine centers are: Aviation Weather Center, Climate Prediction Center, Environmental Modeling Center, Hydrometeorological Prediction Center, Marine Prediction Center, NCEP Central Operations, Space Environment Center, Storm Prediction Center and Tropical Prediction Center (formerly the National Hurricane Center).

3. National Climatic Data Center (NCDC )
NCDC maintains the world's largest active archive of weather data. NCDC produces numerous climate publications and responds to data requests from all over the world.

4. National Oceanic and Atmospheric Administration (NOAA )
NOAA's historical role has been to predict environmental changes, protect life and property, provide decision makers with reliable scientific information, and foster global environmental stewardship. Today NOAA's mission remains unchanged as it describes and predicts changes in the Earth's environment, and conserves and wisely manages the Nation's coastal and marine resources.

5. National Oceanographic and Atmospheric Administration (NOAA )

6. National Weather Service (NWS )
The National Weather Service (NWS) - provides weather, hydrologic, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy. NWS data and products form a national information database and infrastructure which can be used by other governmental agencies, the private sector, the public, and the global community.

7. Negative-tilt Trough
An upper level system which is tilted to the west with increasing latitude (i.e., with an axis from southeast to northwest). A negative-tilt trough often is a sign of a developing or intensifying system.

8. Nested Grid Model (NGM )
One of the operational forecast models run at NCEP. The NGM is run twice daily, with forecast output out to 48 hours.

9. nexrad
NEXt Generation RADar. A NWS network of about 160 Doppler radars being installed nationwide.

10. NEXt-Generation Weather RADar (NEXRAD )
Technologically-advanced weather radar being deployed to replace WSR-57 and WSR-74 units. NEXRAD is a high-resolution Doppler radar with increased emphasis on automation, including use of algorithms and automated volume scans. NEXRAD units are known as WSR-88D.

11. Nocturnal
Related to nighttime, or occurring at night.

12. North Atlantic Oscillation (NAO )

13. Nowcast
A short-term weather forecast, generally out to six hours or less.

14. Numerical Weather Prediction (NWP )