NOAA URMA API (Unrestricted Mesoscale Analysis)

CEIL –Ceiling Height (m)

1 variant

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

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

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

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

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

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

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

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

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

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

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

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":""}`

Unrestricted Mesoscale Analysis (URMA)

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