URMA


Datasets:

  • Unrestricted Mesoscale Analysis

Description: URMA (Unrestricted Mesoscale Analysis) is NOAA's hourly, high-resolution, near-surface “analysis of record.” It reruns the RTMA system approximately six hours after each valid time, assimilating conventional, mesonet, buoy, ship, shelter, and radar-based observations that arrive too late for RTMA. This also includes advanced precipitation QPE from radar and gauge blends, and snowfall updates from NOHRSC, merged via methods like Whittaker blending.

URMA uses a two-dimensional variational (2D-Var) assimilation with static background error covariances (gridpoint-statistical-interpolation, GSI) to combine observations and a first-guess model field.

Organization: NOAA/NWS

Website: https://www.nco.ncep.noaa.gov/pmb/products/rtma/

Google Earth Engine: N/A

Spatial resolution: 2.5-km grid

Time Span: 1980-01-01 to present

Variables:

  • Maximum Daily Temperature
  • Minimum Daily Temperature
  • Average Daily Temperature
  • Extraterrestrial Solar Radiation
  • Downward Surface Short Wave Solar Radiation
  • Clear Sky Surface Short Wave Solar Radiation (Simple Method)
  • Clear Sky Surface Short Wave Solar Radiation (ASCE Method)
  • Specific Humidity
  • Wind Speed
  • Wind Direction (from which blowing)
  • Maximum Daily Wind Gust
  • Minimum Daily Wind Gust
  • Average Daily Wind Gust
  • Total Cloud Cover (24 hour mean)
  • Total Cloud Cover (weighted by mean solar radiation)
  • Atmospheric Pressure
  • Dew Point Temperature
  • Actual Vapor Pressure
  • Precipitation Total
  • ASCE Grass Reference ET (summed hourly)
  • ASCE Alfalfa Reference ET (summed hourly)

Terms of Use:

  • OAA data disseminated through NODD are open to the public and can be used as desired. NOAA makes data openly available to ensure maximum use of our data, and to spur and encourage exploration and innovation throughout the industry. NOAA requests attribution for the use or dissemination of unaltered NOAA data. However, it is not permissible to state or imply endorsement by or affiliation with NOAA. If you modify NOAA data, you may not state or imply that it is original, unaltered NOAA data.

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