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Dataset Overview | National Centers for Environmental Information (NCEI)

Convective Sigmets

Convective Sigmet maps cover the contiguous U.S. and are produced monthly. These maps are provided as an aid in evaluating the impact of thunderstorms on the U.S. Airspace System using the methods developed by Slemmer and Silberberg (2004). Convective Sigmets (CSIG) are issued by NOAA's Aviation Weather Center as a means of advising aircraft pilots of convective activity that is deemed hazardous to aviation. Convective Sigmets are text bulletins routinely issued on an hourly basis at 55 minutes past the hour, as well as times between hours (non-routine issuances) when areas of convection develop rapidly. Each CSIG is a subjectively drawn polygon, line, or circle that depicts convection whenever a specified set of criteria are met. Convective Sigmets are weather advisories concerning convective weather significant to the safety of all aircraft. Convective SIGMETs are issued for tornadoes, lines of thunderstorms, embedded thunderstorms of any intensity level, areas of thunderstorms greater than or equal to VIP level 4 with an area coverage of 4/10 (40%) or more, and hail 3/4 inch or greater.
Cite this dataset when used as a source.
  • ID not available.
gov.noaa.ncdc:C00644
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Distribution Formats
    Distributor Customer Engagement Branch
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    1-828-271-4800
    ncei.orders@noaa.gov
    Dataset Point of Contact Customer Engagement Branch
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    1-828-271-4800
    ncei.orders@noaa.gov
    Time Period 1995-01-01 to Present
    Spatial Bounding Box Coordinates
    West: -125.0
    East: -66.0
    South: 24.0
    North: 50.0
    Spatial Coverage Map
    Dataset Information
    General Documentation
    Associated Resources
    • Convective Significant Meteorological Advisory (SIGMET) Climatology
    Publication Dates
    • publication: unknown
    Data Presentation Form mapDigital
    Dataset Progress Status Under development - data is currently in the process of being created
    Data Update Frequency Monthly
    Purpose To make a wide range of climatic data available to researchers and the public.
    Cited Authors
    • User Engagement and Services Branch
      DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Originators
    • User Engagement and Services Branch
      DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Publishers
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • Earth Science > Atmosphere > Precipitation
    • Earth Science > Atmosphere > Altitude > Tropopause
    • Earth Science > Atmosphere > Weather Events > Lightning
    • Earth Science > Atmosphere > Weather Events > Rain Storms
    • Earth Science > Atmosphere > Weather Events > Tornados
    • Earth Science > Atmosphere > Atmospheric Pressure > Anticyclones/Cyclones
    • Earth Science > Atmosphere > Atmospheric Temperature > Atmospheric Stability
    • Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Indicators > Total Precipitable Water
    • Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Convection
    • Earth Science > Ocean > Ocean Winds > Convergence/Divergence
    • Earth Science > Atmosphere > Atmospheric Winds > Upper Level Winds > Flight Level Winds
    • Earth Science > Atmosphere > Atmospheric Winds > Surface Winds
    • Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Turbulence
    • Earth Science > Atmosphere > Atmospheric Winds > Upper Level Winds
    • Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Vertical Wind Velocity/Speed
    • Earth Science > Atmosphere > Atmospheric Winds > Wind Profiles
    • Earth Science > Atmosphere > Atmospheric Winds > Wind Dynamics > Wind Shear
    • Earth Science > Atmosphere > Clouds > Cloud Properties > Cloud Height
    • Earth Science > Atmosphere > Clouds > Cloud Properties > Cloud Frequency
    • Earth Science > Atmosphere > Clouds > Cloud Types
    • Earth Science > Human Dimensions > Infrastructure > Transportation
    • Earth Science > Spectral/Engineering > Radar
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • 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
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Continent > North America > United States Of America
    Stratum keywords Global Change Master Directory (GCMD) Location Keywords
    • Vertical Location > Troposphere
    Keywords
    • Metadata_Not_Published
    Use Constraints
    • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
    Access Constraints
    • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, 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.
    Fees
    • In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
    Lineage information for: dataset
    Processing Steps
    • Unknown
    Lineage information for: repository
    Processing Steps
    • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
    Last Modified: 2018-11-05
    For questions about the information on this page, please email: ncei.orders@noaa.gov