Bundles
We have organized our Weather variables in bundles, each one grouping variables for a specific domain. The bundles currently available are:
Basic Bundle (basic)
|
Field Name |
Vertical Level |
Description |
Units |
|
Temperature |
2 meters AGL |
Air temperature at standard observation height (2 meters above the surface) |
K |
|
Relative humidity |
2 meters AGL |
The fractional ratio of the partial pressure of water vapor to the equilibrium vapor pressure at a given temperature, expressed as a percentage |
% |
|
Dewpoint temperature |
2 meters AGL |
Temperature at which a parcel of air cooled at constant pressure and specific humidity reaches saturation |
K |
|
u-wind component |
10 meters AGL |
The eastward component of the horizontal wind |
m/s |
|
v-wind component |
10 meters AGL |
The northward component of the horizontal wind |
m/s |
|
Mean sea-level pressure |
Sea level |
Air pressure adjusted to mean sea level |
Pa |
|
Accumulated precipitation |
Surface |
The total accumulated (liquid) precipitation occurring since the beginning of the forecast Read more about working with accumulated fields. |
kg/m2 |
|
Wind gust speed |
10 meters AGL |
Instantaneous wind gust (speed) |
m/s |
|
Maximum temperature |
2 meters AGL |
Maximum air temperature in the previous six hours |
K |
|
Minimum temperature |
2 meters AGL |
Minimum air temperature in the previous six hours |
K |
|
Cloud cover |
Whole atmosphere |
The percentage of the sky covered by clouds |
% |
|
Visibility |
Surface |
The horizontal visibility |
m |
This bundle is available at the file, point, and WMS API endpoints.
Maritime Bundle (maritime)
|
Field Name |
Vertical Level |
Description |
Units |
|
Sea Surface Temperature |
Sea level |
The temperature of the ocean surface |
K |
|
Ocean Currents (eastward component) |
Sea level |
The eastward component of the ocean current vector |
m/s |
|
Ocean Currents (northward component) |
Sea level |
The northward component of the ocean current vector |
m/s |
|
Significant Wave Height |
Sea level |
Wave heights of combined swell and wind waves |
m |
|
Mean Wave Direction |
Sea level |
Mean wave direction of combined swell and wind waves |
Degrees |
|
Mean Wave Period |
Sea level |
Mean wave period of combined swell and wind waves |
Seconds |
This bundle is available at the file, point, and WMS API endpoints.
Maritime Atmospheric Bundle (maritime-atmos)
|
Field Name |
Vertical Level |
Description |
Units |
|
u-wind component |
50 meters AGL |
The eastward component of the horizontal wind Download a sample of how to convert from u/v components to speed and direction. |
m/s |
|
v-wind component |
50 meters AGL |
The northward component of the horizontal wind |
m/s |
This bundle is available at the file, point, and WMS API endpoints.
Maritime Waves Bundle (maritime-wave)
|
Field Name |
Vertical Level |
Description |
Units |
|
Significant Wind Wave Height |
Sea level |
Wave heights of waves generated by local winds |
m |
|
Mean Wind Wave Direction |
Sea level |
Mean wave direction of waves generated by local winds |
Degrees |
|
Mean Wind Wave Period |
Sea level |
Mean wave period of waves generated by local winds |
Seconds |
|
Significant Total Swell Wave Height |
Sea level |
Wave heights of combined swell waves |
m |
|
Mean Total Swell Wave Direction |
Sea level |
Mean wave direction of combined swell waves |
Degrees |
|
Mean Total Swell Wave Period |
Sea level |
Mean wave period of combined swell waves |
Seconds |
This bundle is available at the file, point, and WMS API endpoints.
Thunderstorm Bundle (thunderstorm)
|
Field Name |
Vertical Level |
Description |
Units |
|
CAPE |
Whole atmosphere |
Convective Available Potential Energy |
J/kg |
|
CIN |
Whole atmosphere |
Convective Inhibition |
J/kg |
|
Lifted Index |
Whole atmosphere |
The temperature difference between the air lifted from the surface to 500 hPa and the environmental temperature at that level |
K |
|
Storm-relative helicity |
0-3 km |
A measure of the transfer of vorticity from the environment to an air parcel in convective motion from a frame of reference moving with a thunderstorm |
m2/s2 |
|
Storm motion (eastward component) |
0-6 km |
The eastward component of the storm-motion vector |
m/s |
|
Storm motion (northward component) |
0-6 km |
The northward component of the storm-motion vector |
m/s |
|
0-6 km shear vector (eastward component) |
0-6 km |
The eastward component of the deep-layer shear vector |
s−1 |
|
0-6 km shear vector (northward component) |
0-6 km |
The northward component of the deep-layer shear vector |
s−1 |
|
Precipitable Water |
Whole atmosphere |
The depth of water in a column of the atmosphere, if all the water in that column were precipitated as rain |
kg/m2 |
This bundle is available at the file API endpoint.
Upper Air Bundle (upper-air)
|
Field Name |
Vertical Level |
Description |
Units |
|
Geopotential height |
Isobaric levels |
The approximate height of a given point in the atmosphere above the surface of the earth accounting for variations in gravity |
gpm |
|
Temperature |
Isobaric levels |
Air temperature |
K |
|
u-wind component |
Isobaric levels |
The eastward component of the horizontal wind |
m/s |
|
v-wind component |
Isobaric levels |
The northward component of the horizontal wind |
m/s |
|
Relative humidity |
Isobaric levels |
The fractional ratio of the partial pressure of water vapor to the equilibrium vapor pressure at a given temperature expressed as a percentage |
% |
|
Vertical velocity |
Isobaric levels |
The component of the full velocity vector in the vertical direction |
m/s |
|
Absolute vorticity |
Isobaric levels |
The vertical component of the absolute vorticity vector measuring the local rotation of the atmosphere |
s−1 |
|
Cloud water mixing ratio |
Isobaric levels |
The ratio of the mass of non-precipitating liquid water to the mass of dry air in a unit volume of air |
kg/kg |
|
Cloud ice mixing ratio |
Isobaric levels |
The ratio of the mass of non-precipitating frozen water to the mass of dry air in a unit volume of air |
kg/kg |
This bundle is available at the file API endpoint. The following isobaric levels are available: 1000, 950, 925, 900, 850, 800, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20 hPa.
Aviation Bundle (aviation)
|
Field Name |
Vertical Level |
Description |
Units |
|
Temperature |
Flight levels |
Air temperature |
K |
|
Relative humidity |
Flight levels |
The fractional ratio of the partial pressure of water vapor to the equilibrium vapor pressure at a given temperature, expressed as a percentage |
% |
|
u-wind component |
Flight levels |
The eastward-component of the horizontal wind |
m/s |
|
v-wind component |
Flight levels |
The northward-component of the horizontal wind |
m/s |
|
Visibility |
Surface |
The horizontal visibility |
m |
|
Height |
Level of max. winds |
The height (above sea level) where the maximum wind speed is found |
gpm |
|
u-wind component |
Level of max. winds |
The eastward component of the horizontal wind |
m/s |
|
v-wind component |
Level of max. winds |
The northward component of the horizontal wind |
m/s |
|
Clear-air turbulence |
Flight levels |
Potential severity of turbulence associated with wind shear (not due to mountain waves or convection), using the EDR (Eddy Dissipation Rate). |
% |
|
Icing severity |
Flight levels |
Potential for aircraft icing (0-1) |
0 - 1 |
This bundle is available at the file API endpoint.
The flight levels currently available range from FL100 to FL450 (10,000 feet to 45,000 feet mean sea level), in 1000ft increments.
The altitudes in the files are shown in meters and correspond to the following values:
- 3048, 3352, 3657, 3962, 4267, 4572, 4876, 5181, 5486, 5791, 6096, 6400, 6705, 7010, 7315, 7620, 7924, 8229, 8534, 8839, 9144, 9448, 9753, 10058, 10363, 10668, 10972, 11277, 11582, 11887, 12192, 12496, 12801, 13106, 13411, 13716.
Agricultural Bundle (agricultural)
|
Field Name |
Vertical Level |
Description |
Units |
|
Skin (surface) temperature |
Surface |
Temperature at the interface between the air and the ground |
K |
|
Specific humidity |
2 meters AGL |
The ratio of the mass of water vapor to the total mass of an air parcel in a moist atmosphere taken at screen level |
kg/kg |
|
Soil moisture |
0-10 cm, 10-40 cm, 40-100 cm, 100-200 cm |
Volumetric soil moisture content, expressed as a fraction, for a given depth below the surface |
Fraction |
|
Soil temperature |
0-10 cm, 10-40 cm, 40-100 cm, 100-200 cm |
The temperature of the soil for a given depth below the surface |
K |
|
Latent heat flux |
Surface |
The exchange of heat between the surface and the air owing to evaporation (and sublimation) |
W/m2 |
|
Sensible heat flux |
Surface |
The exchange of heat between the surface and the air due to the turbulent motion of air |
W/m2 |
This bundle is available at the file and point API endpoints.
Solar Energy Bundle (solar-energy)
|
Field Name |
Vertical Level |
Description |
Units |
|
Incoming shortwave radiation (acc.) |
Surface |
Accumulated shortwave radiation directed at the surface from above, including direct and diffuse components Read more about working with accumulated fields. |
J/m2 |
|
Incoming longwave radiation (acc.) |
Surface |
Accumulated longwave radiation directed at the surface from above |
J/m2 |
|
Outgoing longwave radiation (acc.) |
Surface |
Accumulated longwave radiation directed (upwards) away from the surface |
J/m2 |
|
Outgoing shortwave radiation (acc.) |
Surface |
Accumulated shortwave radiation directed (upwards) away from the surface |
J/m2 |
|
Outgoing longwave radiation (acc.) |
Top of atmosphere |
Accumulated longwave radiation directed (upwards) away from the top of the atmosphere |
J/m2 |
This bundle is available at the file and point API endpoints.
Precipitation Bundle (precipitation)
|
Field Name |
Vertical Level |
Description |
Units |
|
Precipitation Type |
Surface |
The predominant precipitation type. Values are "no_precipitation", "rain", "snow", "freezing_rain", "mixed/ice" Note: At the file API, available as categorical masks for areas of each of the precipitation types |
- |
|
Snowfall Amount |
Surface |
The total accumulated snowfall occurring since the beginning of the forecast. Read more about working with accumulated fields. |
m* |
* Snowfall Amount is provided in Meters for the File API (GRIB2) data, but Centimeters in the Point API
This bundle is available at the file, point, and WMS API endpoints.
Wind Energy Bundle (wind-energy)
|
Field Name |
Vertical Level |
Description |
Units |
|
u-wind component |
80 meters AGL |
The eastward component of the horizontal wind Download a sample of how to convert from u/v components to speed and direction. |
m/s |
|
v-wind component |
80 meters AGL |
The northward component of the horizontal wind |
m/s |
|
u-wind component |
100 meters AGL |
The eastward component of the horizontal wind |
m/s |
|
v-wind component |
100 meters AGL |
The northward component of the horizontal wind |
m/s |
|
u-wind component |
120 meters AGL |
The eastward component of the horizontal wind |
m/s |
|
v-wind component |
120 meters AGL |
The northward component of the horizontal wind |
m/s |
|
Air Density |
80 meters AGL |
The air density at 80 m above ground level. Air density is the density of the atmosphere. It is a function of atmospheric pressure, temperature and humidity and decreases with increasing altitude. |
kg/m³ |
|
Air Density |
100 meters AGL |
The air density at 100 m above ground level. Air density is the density of the atmosphere. It is a function of atmospheric pressure, temperature and humidity and decreases with increasing altitude. |
kg/m³ |
|
Air Density |
120 meters AGL |
The air density at 120 m above ground level. Air density is the density of the atmosphere. It is a function of atmospheric pressure, temperature and humidity and decreases with increasing altitude. |
kg/m³ |
This bundle is available at the file and point API endpoints.
Point-optimized forecast variables
For the point-optimized forecasts, we offer the following list of weather variables:
|
Field Name |
Vertical Level |
Description |
Units |
|
Temperature |
2 meters AGL |
Air temperature at standard observation height (2 m above the surface) |
K |
|
Dewpoint temperature |
2 meters AGL |
Temperature at which a parcel of air cooled at constant pressure and specific humidity reaches saturation |
K |
|
Relative humidity |
2 meters AGL |
The fractional ratio of the partial pressure of water vapor to the equilibrium vapor pressure at a given temperature, expressed as a percentage |
% |
|
24-h Maximum temperature UTC |
2 meters AGL |
Maximum air temperature for the remainder of the current calendar day (day in UTC time - same across all stations) For example, at 18 UTC, the Maximum Temperature is predicted for the period between 19:00 and 23:59. |
K |
|
24-h Minimum temperature UTC |
2 meters AGL |
Minimum air temperature for the remainder of the current calendar day (day in UTC time - same across all stations) |
K |
|
24-h Maximum temperature local |
2 meters AGL |
Maximum air temperature for the remainder of the current calendar day (day in the station local time zone) |
K |
|
24-h Minimum temperature local |
2 meters AGL |
Minimum air temperature for the remainder of the current calendar day (day in the station local time zone) |
K |
|
Mean sea-level pressure |
Sea level |
Air pressure adjusted to mean sea level |
Pa |
|
Cloud ceiling |
Surface |
The height above the Earth's surface of the base of the lowest layer of cloud with a coverage of more than 50%. Data is provided in ranges For example, “0 to 800 m” or “No Ceiling” |
m (range) |
|
Total cloud cover |
Surface |
The percentage of the sky around the location covered by clouds |
% |
|
Visibility |
Surface |
The horizontal visibility |
m |
|
Probability of fog |
Surface |
The probability of fog |
% |
|
Probability of thunderstorm |
Surface |
The probability of thunderstorm |
% |
|
Wind speed |
10 meters AGL |
The wind speed at standard observation height (10 m above the surface) |
m/s |
|
Wind direction |
10 meters AGL |
The meteorological wind direction (90° corresponds to wind from east) |
degrees |
|
Eastward wind velocity |
10 meters AGL |
The eastward component of the horizontal wind. It is the horizontal speed of air moving towards the east |
m/s |
|
Northward wind velocity |
10 meters AGL |
The northward component of the horizontal wind. It is the horizontal speed of air moving towards the north |
m/s |
|
1-h Probability of precipitation |
Surface |
The probability of (liquid) precipitation in the next one hour |
% |
|
1-h Accumulated precipitation |
Surface |
The total accumulated (liquid) precipitation occurring in the next one hour |
mm |
|
3-h Probability of precipitation |
Surface |
The probability of (liquid) precipitation in the next three hours |
% |
|
3-h Accumulated precipitation |
Surface |
The total accumulated (liquid) precipitation occurring in the next three hours |
mm |
|
6-h Probability of precipitation |
Surface |
The probability of (liquid) precipitation in the next six hours |
% |
|
6-h Accumulated precipitation |
Surface |
The total accumulated (liquid) precipitation occurring in the next six hours |
mm |
|
24-h Probability of precipitation |
Surface |
The probability of (liquid) precipitation in the next 24 hours |
% |
|
Conditional probability of rain |
Surface |
Conditional probability of rain. Likelihood of receiving rain if precipitation were actually to occur. |
% |
|
Conditional probability of snow |
Surface |
Conditional probability of snow. Likelihood of receiving snow if precipitation were actually to occur. |
% |
|
Conditional probability of ice |
Surface |
Conditional probability of ice (freezing rain or sleet). Likelihood of receiving ice if precipitation were actually to occur. |
% |
Cloud Ceiling Notes
- The first is total_cloud_cover which is a percentage between 0 and 100.
- The second is ceiling which is an altitude range, with values like 944-1676 m
Cloud ceiling has two components: there must be a certain amount of clouds (broken or overcast coverage) and they must be below a certain level (typically 12,000 ft).
100% coverage of high, thin clouds (like you'd see outside an airplane window) won't give you a ceiling value but would be considered for the total_cloud_cover value.