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NOAA Next Generation Radar (NEXRAD) Level II Base Data
Entry ID: gov.noaa.ncdc.C00345

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Summary
Abstract: This dataset consists of Level II weather radar data collected from Next-Generation Radar (NEXRAD) stations located in the contiguous United States, Alaska, Hawaii, U.S. territories and at military base sites. NEXRAD is a network of 160 high-resolution Doppler weather radars operated by the NOAA National Weather Service (NWS), the Federal Aviation Administration (FAA), and the U.S. Air Force (USAF). Doppler radars detect atmospheric precipitation and winds, which allow scientists to track and anticipate weather events, such as rain, ice pellets, snow, hail, and tornadoes, as well as some non-weather objects like birds and insects. NEXRAD stations use the Weather Surveillance Radar - 1988, Doppler (WSR-88D) system. This is a 10 cm wavelength (S-Band) radar that operates at a frequency between 2,700 and 3,000 MHz. The radar system operates in two basic modes: a slow-scanning Clear Air Mode (Mode B) for analyzing air movements when there is little or no precipitation activity in the area, and a Precipitation Mode (Mode A) with a faster scan for tracking active weather. The two modes employ nine Volume Coverage Patterns (VCPs) to adequately sample the atmosphere based on weather conditions. A VCP is a series of 360 degree sweeps of the antenna at pre-determined elevation angles and pulse repetition frequencies completed in a specified period of time. The radar scan times 4.5, 5, 6 or 10 minutes depending on the selected VCP. The NEXRAD products are divided into multiple data processing levels. The lower Level II data contain the three meteorological base data quantities at original resolution: reflectivity, mean radial velocity, and spectrum width. With the advent of dual polarization beginning in 2011, additional base products of differential reflectivity, correlation coefficient and differential phase are available. Level II data are recorded at all NWS and most USAF and FAA WSR-88D sites. From the Level II quantities, computer processing generates numerous meteorological analysis Level III products. NEXRAD data are acquired by the NOAA National Centers for Environmental Information (NCEI) for archiving and dissemination to users. Data coverage varies by station and ranges from June 1991 to 1 day from present. Most stations began observing in the mid-1990s, and most period of records are continuous.

Purpose: Level-II NEXRAD data include three meteorological base data quantities: reflectivity, mean radial velocity, and spectrum width. With the advent of dual polarization beginning in 2011, additional base products of differential reflectivity, correlation coefficient and differential phase are available.

Related URL
Link: View Related Information
Description: Amazon S3 bucket. NEXRAD Level II archive data is hosted in the "noaa-nexrad-level2" Amazon S3 bucket.


Link: View Related Information
Description: AWS JavaScript S3 Explorer. Browse the contents of the NEXRAD Level II archive via the AWS JavaScript S3 Explorer.


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Description: NCEI Climate Data Online Search Tool. Search for data and metadata by station ID, location, and date range via a text-based interface.


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Description: NCEI GIS Map Viewer. Dynamic GIS mapping application to locate stations and data for selected layers.


Link: View Related Information
Description: NCEI NEXRAD Data Inventory Search. Search for radar data and estimated VCP mode by station ID, location, and date via a text-based interface.


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Description: NCEI ArcGIS REST Services Directory. ArcGIS Server REST API for the dataset.


Link: View Related Information
Description: KMZ file for dataset. Direct download link for KMZ file.


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Description: NCEI NEXRAD page
Informational resources for NEXRAD Radar Data.


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Description: View Source Metadata


Geographic Coverage
 N: 68.0 S: 11.0  E: -64.0  W: 124.0

Data Set Citation
Dataset Originator/Creator: DOC/NOAA/NWS/ROC > Radar Operations Center, National Weather Service, NOAA, U.S. Department of Commerce
Dataset Title: NOAA Next Generation Radar (NEXRAD) Level II Base Data
Dataset Release Date: 1991
Data Presentation Form: imageDigital
Dataset DOI: doi:10.7289/V5W9574V


Temporal Coverage
Start Date: 1991-06-05


Location Keywords
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > AZORES
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > BERING SEA
VERTICAL LOCATION > BOUNDARY LAYER
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > EAST CHINA SEA
CONTINENT > ASIA > EASTERN ASIA
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > KIRIBATI
VERTICAL LOCATION > LAND SURFACE
GEOGRAPHIC REGION > MID-LATITUDE
CONTINENT > NORTH AMERICA
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
GEOGRAPHIC REGION > NORTHERN HEMISPHERE
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > OKINAWA
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO
CONTINENT > ASIA > EASTERN ASIA > SOUTH KOREA
VERTICAL LOCATION > TROPOSPHERE
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > YELLOW SEA
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > MICRONESIA > GUAM


Science Keywords
SPECTRAL/ENGINEERING >RADAR >DOPPLER VELOCITY    [Definition]
SPECTRAL/ENGINEERING >RADAR >RADAR REFLECTIVITY    [Definition]
SPECTRAL/ENGINEERING >RADAR >SPECTRUM WIDTH    [Definition]
SPECTRAL/ENGINEERING >SENSOR CHARACTERISTICS >VIEWING GEOMETRY    [Definition]


Platform
WEATHER STATIONS    [Information]


Instrument
NEXRAD >NEXt Generation RADar    [Information]
DOPPLER RADAR    [Information]


Use Constraints
Cite this dataset when used as a source: NOAA National Weather Service (NWS) Radar Operations Center (1991): NOAA Next Generation Radar (NEXRAD) Level II Base Data. [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V5W9574V [access date].

NCEI cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NCEI makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.


Keywords
EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > DOPPLER VELOCITY
EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > RADAR REFLECTIVITY
EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > SPECTRUM WIDTH
EARTH SCIENCE > SPECTRAL/ENGINEERING > SENSOR CHARACTERISTICS > VIEWING GEOMETRY
Radar
CONTINENT > NORTH AMERICA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
CONTINENT > ASIA > EASTERN ASIA
CONTINENT > ASIA > EASTERN ASIA > SOUTH KOREA
GEOGRAPHIC REGION > MID-LATITUDE
GEOGRAPHIC REGION > NORTHERN HEMISPHERE
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > AZORES
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > GUAM
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > KIRIBATI
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > BERING SEA
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > OKINAWA
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > EAST CHINA SEA
OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > YELLOW SEA
VERTICAL LOCATION > BOUNDARY LAYER
VERTICAL LOCATION > LAND SURFACE
VERTICAL LOCATION > TROPOSPHERE
In Situ Land-based Platforms > WEATHER STATIONS/NETWORKS > WEATHER STATIONS
Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Radar Sounders > NEXRAD > NEXt Generation RADar
Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Radar Sounders > DOPPLER RADAR
DOC/NOAA/NWS/ROC > Radar Operations Center, National Weather Service, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
NOAA Big Data Project (BDP)


Data Set Progress
IN WORK


Data Center
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: https://ncei.noaa.gov/

Data Center Personnel
Name: CUSTOMER ENGAGEMENT BRANCH DOC/NOAA/NESDIS/NCEI
Phone: +1 828-271-4800
Fax: +1 828-271-4876
Email: ncdc.orders at noaa.gov
Contact Address:
151 Patton Avenue
Federal Building, Room 468
City: Asheville
Province or State: NC
Postal Code: 28801-5001
Country: USA


National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.ncdc.noaa.gov/

Data Center Personnel
Name: CUSTOMER ENGAGEMENT BRANCH DOC/NOAA/NESDIS/NCEI
Phone: +1 828-271-4800
Fax: +1 828-271-4876
Email: ncdc.orders at noaa.gov
Contact Address:
151 Patton Avenue
Federal Building, Room 468
City: Asheville
Province or State: NC
Postal Code: 28801-5001
Country: USA



Distribution
Distribution_Format: Native Binary
Fees: See Extended Metadata for fee information

Distribution_Format: ArcGIS
Fees: See Extended Metadata for fee information

Distribution_Format: KMZ
Fees: See Extended Metadata for fee information


Personnel
PHILIP JONES
Role: DIF AUTHOR
Phone: +1 828-271-4800
Fax: +1 828-271-4876
Email: ncdc.metadata at noaa.gov
Contact Address:
Federal Building, Room 468
151 Patton Avenue
City: Asheville
Province or State: NC
Postal Code: 28801-5001
Country: USA


CUSTOMER ENGAGEMENT BRANCH DOC/NOAA/NESDIS/NCEI
Role: TECHNICAL CONTACT
Phone: +1 828-271-4800
Fax: +1 828-271-4876
Email: ncdc.orders at noaa.gov
Contact Address:
151 Patton Avenue
Federal Building, Room 468
City: Asheville
Province or State: NC
Postal Code: 28801-5001
Country: USA



Creation and Review Dates
DIF Creation Date: 2016-04-11
Last DIF Revision Date: 2016-04-18

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