Iowa Environmental Mesonet
   National Weather Service NEXRAD Storm Attributes Shapefile

*** Warning: This information is provided without warranty and its future
    availability is not guaranteed by Iowa State University ***

This file contains a current snapshot of NEXRAD storm attributes from the
last received volume scan from each NWS WSR-88D RADAR.  Any storm
attribute from a volume scan 20+ minutes old is not included.

The DBF Columns are as follows.
  - VALID    Timestamp of the NEXRAD Volume Scan YearMonthDayHourMinute
  - NEXRAD   3 character identifier of the WSR-88D
  - STORM_ID Local WSR-88D assigned storm attribute ID
  - AZIMUTH  Direction from north of the attribute in relation to the
             NEXRAD [degree] 90 == East, 180 == South
  - RANGE    Distance away from RADAR in miles
  - TVS      Tornado Vortex Signature, available values below
             NONE - No TVS detected
             TVS  - Low Level TVS detected
             ETVS - Elevated TVS detected
  - MESO     Mesocyclone, available values below
             NONE - No MESO Detected
             3DCO - 3 Dimensional Correlated Shear Detected
             MESO - Mesocyclone Identified
             UNCO - Uncorrelated 2-D Shear Detected
             1-25 - A number between 1 and 25, not sure what this means yet
  - POSH     Probability of Severe Hail (+0.75" or larger)
  - POH      Probability of Hail
  - MAX_SIZE Maximum Hail Size in inches
  - VIL      Vertically Integrated Liquid [inches]
  - MAX_DBZ  Maximum dBZ value
  - MAX_DBZ_ Height of Maximum dBZ in thousands of feet
  - TOP      Storm Top in thousands of feet
  - DRCT     Storm movement direction [degrees from north]
  - SKNT     Storm movement velocity [knots]
  - LAT      Convenience replication of the data in the SHP file [deg North]
  - LON      Convenience replication of the data in the SHP file [deg East]

Contact Info:
  Daryl Herzmann akrherz@iastate.edu 515-294-5978