GribStream

Unrestricted Mesoscale Analysis (URMA)

Código GribStream: urma

Descrição

URMA (Unrestricted Mesoscale Analysis) é uma análise de superfície pós-processada da NOAA/NCEP. Ela reexecuta o fluxo RTMA depois que observações adicionais ficam disponíveis, gerando uma análise de maior qualidade para verificação e produtos históricos.

Enquanto RTMA prioriza latência baixa, URMA prioriza uma análise mais completa. Por isso, costuma ser a opção certa quando você precisa avaliar previsões passadas, treinar modelos, calibrar produtos ou construir rótulos de referência.

No GribStream, urma fornece campos horários de superfície e perto da superfície, incluindo temperatura, vento, pressão, umidade, nuvens e precipitação analisada quando a fonte publica esses campos.

URMA funciona bem como referência para comparar GFS, HRRR, NBM e modelos de IA. Para um estado mais rápido e ainda preliminar, use RTMA.

Detalhes

Datasets relacionados

Parâmetros

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Clique em um parâmetro para ver as variantes em uma tabela compacta, com seletores JSON prontos para copiar. Códigos, níveis e valores do seletor ficam exatamente como a API expõe.

CEIL –Ceiling Height (m)
1 variant
NOAA GRIB2 Table 4.2-0-3

Ceiling height is the altitude of the lowest cloud base that covers a significant portion of the sky. It is a key aviation and surface-visibility metric.

  • Units: m.
Level Info Horizon Introduced Selector
cloud ceiling 0h 2017-05-01
{"name":"CEIL","level":"cloud ceiling","info":""}
DPT –Dew Point Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Dew point temperature is the temperature at which the air becomes saturated. It is a direct measure of moisture content.

  • Units: K.
  • When dew point is close to air temperature, fog or low cloud potential increases.
Level Info Horizon Introduced Selector
2 m above ground 0h 2017-05-01
{"name":"DPT","level":"2 m above ground","info":""}
GUST –Wind Speed (Gust) (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

Wind gust is the peak short-duration wind speed. It captures brief, hazardous bursts that can exceed sustained winds.

  • Units: m/s.
Level Info Horizon Introduced Selector
10 m above ground 0h 2017-05-01
{"name":"GUST","level":"10 m above ground","info":""}
HGT –Geopotential Height (gpm)
1 variant
NOAA GRIB2 Table 4.2-0-3

Geopotential height is the altitude of a pressure surface in the atmosphere. It is the primary field for identifying ridges, troughs, and large‑scale flow patterns.

  • Units: gpm.
Level Info Horizon Introduced Selector
surface 0h 2017-05-01
{"name":"HGT","level":"surface","info":""}
PRES –Pressure (Pa)
1 variant
NOAA GRIB2 Table 4.2-0-3

Pressure is the atmospheric pressure at the specified level. It is a fundamental mass-field variable for dynamics and thermodynamics.

  • Units: Pa.
Level Info Horizon Introduced Selector
surface 0h 2017-05-01
{"name":"PRES","level":"surface","info":""}
SPFH –Specific Humidity (kg/kg)
1 variant
NOAA GRIB2 Table 4.2-0-1

Specific humidity is the mass of water vapor per mass of air at the specified level. It is central to moisture transport.

  • Units: kg/kg.
  • Higher values indicate more atmospheric moisture and greater cloud or precip potential.
Level Info Horizon Introduced Selector
2 m above ground 0h 2017-05-01
{"name":"SPFH","level":"2 m above ground","info":""}
TMP –Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Air temperature is the thermal state of the atmosphere at the specified level. It influences density, stability, and energy exchange.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground 0h 2017-05-01
{"name":"TMP","level":"2 m above ground","info":""}
UGRD –U-Component of Wind (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

U‑component of wind is the east‑west component of the horizontal wind. Combine with v for speed and direction.

  • Units: m/s.
  • Combine u and v components to compute speed and direction.
Level Info Horizon Introduced Selector
10 m above ground 0h 2017-05-01
{"name":"UGRD","level":"10 m above ground","info":""}
VGRD –V-Component of Wind (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

V‑component of wind is the north‑south component of the horizontal wind. Combine with u for speed and direction.

  • Units: m/s.
  • Combine u and v components to compute speed and direction.
Level Info Horizon Introduced Selector
10 m above ground 0h 2017-05-01
{"name":"VGRD","level":"10 m above ground","info":""}
VIS –Visibility (m)
1 variant
NOAA GRIB2 Table 4.2-0-7

Horizontal visibility at the surface. Lower values indicate reduced visibility due to fog, precipitation, or aerosols.

  • Units: m.
Level Info Horizon Introduced Selector
surface 0h 2017-05-01
{"name":"VIS","level":"surface","info":""}
WDIR –Wind Direction (degrees)
1 variant
NOAA GRIB2 Table 4.2-0-2

Wind direction indicates the direction from which the wind is blowing at the specified level.

  • Units: degrees.
Level Info Horizon Introduced Selector
10 m above ground 0h 2017-05-01
{"name":"WDIR","level":"10 m above ground","info":""}
WIND –Wind Speed (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

Wind speed is the magnitude of the horizontal wind at the specified level. It is used for transport, mixing, and hazards.

  • Units: m/s.
Level Info Horizon Introduced Selector
10 m above ground 0h 2017-05-01
{"name":"WIND","level":"10 m above ground","info":""}

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