URMA - 2.5km - Daily¶
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.
Climate Engine details¶
- Dataset type
- Climate/Hydrology
- Climate Engine ID
- URMA
- Documentation
- https://support.climateengine.org/article/201-urma
Dataset details¶
- Scale
- 2.5km
- Frequency
- Daily
- Coverage
- CONUS
- Start year
- 1985
- End year
- Present
Earth Engine collection details¶
- Earth Engine asset
- projects/climate-engine-pro/assets/noaa-urma/daily
- Earth Engine source catalog
- ClimateEngine.org
Variables¶
API variable docs: #unrestricted-mesoscale-analysis
| Name | Units |
|---|---|
| ASCE Alfalfa Reference ET (summed hourly) | N/A |
| ASCE Grass Reference ET (summed hourly) | N/A |
| Actual Vapor Pressure | kPa |
| Atmospheric Pressure | kPa |
| Average Daily Wind Gust 10m | N/A |
| Clear Sky Surface Short Wave solar radiation (ASCE method) | W/m^2 |
| Clear Sky Surface Short Wave solar radiation (simple method) | W/m^2 |
| Climatic Water Balance (PPT-ETo) | mm |
| Dew Point Temperature | deg K |
| Downward Surface Short Wave solar radiation | W/m^2 |
| Evap. Demand Drought Index Hargreaves (EDDI) | N/A |
| Evaporative Demand Drought Index (EDDI) | N/A |
| Extraterrestrial Solar Radiation | W/m^2 |
| Maximium Temperature | deg K |
| Maximum Daily Wind Gust 10m | N/A |
| Mean Temperature | deg K |
| Minimum Daily Wind Gust 10m | N/A |
| Minimum Temperature | deg K |
| Potential ET Hargreaves | mm |
| Potential Water Deficit Hargreaves | mm |
| Precipitation | N/A |
| Specific Humidity | 1/1000 kg/kg |
| Standardized Precipitation Evapotranspiration Index (SPEI) | N/A |
| Standardized Precipitation Evapotranspiration Index Hargreaves (SPEI) | N/A |
| Standardized Precipitation Index (SPI) | N/A |
| Total Cloud Cover (24 hour mean) | N/A |
| Total Cloud Cover (weighted mean by solar raidation) | % |
| Wind Direction | N/A |
| Wind Speed | N/A |
References¶
No references listed.
Website: https://www.nco.ncep.noaa.gov/pmb/products/rtma/
Processing steps¶
- In the URMA collection due to missing hours in the original data there are missing days in the dataset. We have gap filled by bias correcting and downscaling ERA5 LAND for the available variables. Among the variables not bias corrected are TCDC (24 hour mean), GMAX, GMIN, GAVG, PCP. Also, ERA5 LAND is not available over the ocean so gap filled day will not have the same overall extent as the original URMA data. 2)The variables above labeled as 'calculated from URMA' were calculated by the ClimateEngine.org team from the URMA datasets and are stored as variables in the Google Earth Engine asset that is used in the Climate Engine app and API. The solar radiation variables are used as inputs into the ASCE Reference ET calculations.
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.