GribStream

National Blend of Models (NBM) — Oceanic core grid

GribStream Code: nbmoc

Other NBM core grids: nbm, nbmak, nbmhi, nbmpr, nbmgu

NBM v5 status: NBM v5 is now operational in this dataset. In the GribStream archive, runs before 2026-05-05 12:00 UTC contain the previous operational NBM version; runs from 2026-05-05 12:00 UTC onward use NBM v5. Accumulation fields such as APCP, ASNOW, and FICEAC, where present, now continue through the expanded NBM v5 hourly range, then proceed with longer accumulation periods in /timeseries without gaps or duplicate windows.

Description

NBM (National Blend of Models) is NOAA’s flagship post-processing system for gridded forecasts. This dataset exposes the Oceanic NBM core grid through the GribStream API, enabling large-window extractions without downloading GRIB files.

The blending is performed with statistically sophisticated techniques such as Model Output Statistics (MOS), quantile mapping, and ensemble weighting, producing calibrated gridded fields that support decision making workflows.

Detail

Parameters

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Click a parameter to reveal variants in a compact table with ready-to-copy JSON selectors.

APTMP –Apparent Temperature (K)
1 variant
NOAA GRIB2 Table 4.2-0-0

Apparent temperature combines air temperature, humidity, and wind to estimate how hot or cold it feels to humans. It is useful for heat and cold stress assessments.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground 2h-264h 2026-05-05
{"name":"APTMP","level":"2 m above ground","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 50% level 2h-264h 2026-05-05
{"name":"DPT","level":"2 m above ground","info":"50% level"}
FRZSPR –Freezing Spray Indicator (boolean)
1 variant
NOAA GRIB2

Freezing spray indicator flags marine conditions favorable for ice accretion on vessels. It depends on wind, air temperature, and wave conditions.

  • Units: boolean.
Level Info Horizon Introduced Selector
surface 2h-264h 2024-04-15
{"name":"FRZSPR","level":"surface","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 50% level 2h-264h 2020-10-01
{"name":"GUST","level":"10 m above ground","info":"50% level"}
HTSGW –Significant Wave Height (m)
5 variants
NOAA GRIB2 Table 4.2-0-3

Significant wave height represents the average height of the highest third of waves. It is the standard metric for sea state and marine hazards.

  • Units: m.
Level Info Horizon Introduced Selector
surface 2h-240h 2020-10-01
{"name":"HTSGW","level":"surface","info":""}
surface 10% level 2h-240h 2023-01-16
{"name":"HTSGW","level":"surface","info":"10% level"}
surface 50% level 2h-240h 2023-01-16
{"name":"HTSGW","level":"surface","info":"50% level"}
surface 90% level 2h-240h 2023-01-16
{"name":"HTSGW","level":"surface","info":"90% level"}
surface ens std dev 2h-240h 2020-10-01
{"name":"HTSGW","level":"surface","info":"ens std dev"}
TCDC –Total Cloud Cover (percent)
2 variants
NOAA GRIB2 Table 4.2-0-6

Total cloud cover is the fraction of the grid cell covered by clouds at any level. It influences radiation, temperature, and visibility.

  • Units: percent.
  • Cloud fraction influences surface radiation and temperature.
Level Info Horizon Introduced Selector
surface 2h-264h 2026-05-05
{"name":"TCDC","level":"surface","info":""}
surface ens std dev 2h-264h 2026-05-05
{"name":"TCDC","level":"surface","info":"ens std dev"}
THUNC –Thunderstorm Probability (percent)
1 variant
NOAA GRIB2 Table 4.2-0-7

Thunderstorm probability gives the chance of thunderstorms during the valid period. It is used for convective hazard guidance.

  • Units: percent.
Level Info Horizon Introduced Selector
entire atmosphere 1h-36h 2023-01-16
{"name":"THUNC","level":"entire atmosphere","info":""}
TMP –Temperature (K)
2 variants
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 50% level 2h-264h 2020-10-01
{"name":"TMP","level":"2 m above ground","info":"50% level"}
surface 2h-264h 2020-10-01
{"name":"TMP","level":"surface","info":""}
TPWDIR –Total Precipitable Water Transport Direction (degrees)
1 variant
NOAA GRIB2 Table 4.2-0-1

Total precipitable water transport direction is the direction of column‑integrated moisture flux. It indicates moisture transport pathways.

  • Units: degrees.
Level Info Horizon Introduced Selector
10 m above ground 2h-167h 2024-05-14
{"name":"TPWDIR","level":"10 m above ground","info":""}
TPWSPD –Total Precipitable Water Transport Speed (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-1

Total precipitable water transport speed is the magnitude of column‑integrated moisture transport. It highlights atmospheric river strength.

  • Units: m/s.
Level Info Horizon Introduced Selector
10 m above ground 2h-167h 2024-05-14
{"name":"TPWSPD","level":"10 m above ground","info":""}
TSTM –Thunderstorm Indicator (boolean)
1 variant
NOAA GRIB2

Thunderstorm indicator flags the presence of thunderstorm conditions in the grid cell. It is used as a categorical hazard field.

  • Units: boolean.
Level Info Horizon Introduced Selector
surface probability forecast 1h-192h 2020-10-01
{"name":"TSTM","level":"surface","info":"probability forecast"}
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 50% level 2h-264h 2020-10-01
{"name":"VIS","level":"surface","info":"50% level"}
WDIR –Wind Direction (degrees)
6 variants
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 5h-264h 2020-10-01
{"name":"WDIR","level":"10 m above ground","info":""}
10 m above ground 50% level 5h-264h 2020-10-01
{"name":"WDIR","level":"10 m above ground","info":"50% level"}
10 m above ground 75% level 5h-264h 2020-10-01
{"name":"WDIR","level":"10 m above ground","info":"75% level"}
10 m above ground 90% level 5h-264h 2020-10-01
{"name":"WDIR","level":"10 m above ground","info":"90% level"}
30 m above ground 50% level 5h-264h 2020-10-01
{"name":"WDIR","level":"30 m above ground","info":"50% level"}
80 m above ground 50% level 5h-264h 2020-10-01
{"name":"WDIR","level":"80 m above ground","info":"50% level"}
WIND –Wind Speed (m/s)
8 variants
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 5h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":""}
10 m above ground 10% level 2h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":"10% level"}
10 m above ground 25% level 2h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":"25% level"}
10 m above ground 50% level 2h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":"50% level"}
10 m above ground 75% level 2h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":"75% level"}
10 m above ground 90% level 2h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":"90% level"}
30 m above ground 50% level 2h-264h 2020-10-01
{"name":"WIND","level":"30 m above ground","info":"50% level"}
80 m above ground 50% level 2h-264h 2020-10-01
{"name":"WIND","level":"80 m above ground","info":"50% level"}

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