GribStream

National Blend of Models (NBM) — Hawaii core grid

GribStream Code: nbmhi

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

Description

NBM (National Blend of Models) is NOAA’s flagship post-processing system for gridded forecasts across the United States. This dataset exposes the Hawaii NBM core grid through the same GribStream API used for CONUS and global models.

The blending is performed with statistically sophisticated techniques such as Model Output Statistics (MOS), quantile mapping, and ensemble weighting. Forecasts are bias-corrected against analyses such as URMA (where applicable), ensuring consistency and reliability.

Detail

Parameters

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

APCP –Accumulated Precipitation (kg/m^2)
2 variants
NOAA GRIB2 Table 4.2-0-1

Accumulated precipitation represents the total water-equivalent amount of rain and snow during the output period. It is a primary field for hydrologic impacts and event totals.

  • Units: kg/m^2.
  • Use with the model time interval to interpret totals and compare to gauges.
Level Info Horizon Introduced Selector
surface prob >0.254 1h-36h 2020-10-01
{"name":"APCP","level":"surface","info":"prob >0.254"}
surface 1h-36h 2020-10-01
{"name":"APCP","level":"surface","info":""}
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 1h-264h 2020-10-01
{"name":"APTMP","level":"2 m above ground","info":""}
CAPE –Convective Available Potential Energy (J/kg)
2 variants
NOAA GRIB2

Convective Available Potential Energy (CAPE) quantifies buoyant energy available to rising air parcels. Larger values generally imply stronger potential updrafts and greater convective intensity.

  • Units: J/kg.
  • Often used with CIN and lifting mechanisms to assess thunderstorm potential.
Level Info Horizon Introduced Selector
surface 1h-264h 2020-10-01
{"name":"CAPE","level":"surface","info":""}
surface ens std dev 1h-264h 2020-10-01
{"name":"CAPE","level":"surface","info":"ens std dev"}
CEIL –Ceiling Height (m)
2 variants
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 1h-78h 2020-10-01
{"name":"CEIL","level":"cloud ceiling","info":""}
cloud base 1h-84h 2020-10-01
{"name":"CEIL","level":"cloud base","info":""}
DIST –Distance to Feature (km)
1 variant
NOAA GRIB2

Distance to feature is the horizontal distance to the named hazard or boundary in the source product. It is used to map proximity to key features like fronts or hazards.

  • Units: km.
Level Info Horizon Introduced Selector
surface - 610 m above ground 1h-36h 2020-10-01
{"name":"DIST","level":"surface - 610 m above ground","info":""}
DPT –Dew Point Temperature (K)
2 variants
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 1h-264h 2020-10-01
{"name":"DPT","level":"2 m above ground","info":""}
2 m above ground ens std dev 1h-264h 2020-10-01
{"name":"DPT","level":"2 m above ground","info":"ens std dev"}
DSWRF –Downward Shortwave Radiation Flux (W/m^2)
1 variant
NOAA GRIB2 Table 4.2-0-4

Downward radiative flux represents incoming energy at the surface. It is a key driver of surface heating and cooling.

  • Units: W/m^2.
  • Shortwave affects surface heating; longwave affects radiative cooling.
Level Info Horizon Introduced Selector
surface 1h-264h 2020-10-01
{"name":"DSWRF","level":"surface","info":""}
ELLINX –Ellrod Index (unitless)
1 variant
NOAA GRIB2

Ellrod index is a diagnostic for clear-air turbulence based on deformation and vertical wind shear. Higher values indicate greater turbulence potential for aviation.

  • Units: unitless.
Level Info Horizon Introduced Selector
400-300 mb 1h-259h 2022-06-01
{"name":"ELLINX","level":"400-300 mb","info":""}
FOSINDX –Fosberg Fire Weather Index (unitless)
1 variant
NOAA GRIB2

Fosberg fire weather index combines temperature, humidity, and wind to estimate potential fire spread. Higher values indicate more favorable wildfire conditions.

  • Units: unitless.
Level Info Horizon Introduced Selector
surface 6h-264h 2020-10-01
{"name":"FOSINDX","level":"surface","info":""}
GUST –Wind Gust Speed (m/s)
2 variants
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 1h-264h 2020-10-01
{"name":"GUST","level":"10 m above ground","info":""}
10 m above ground ens std dev 1h-264h 2020-10-01
{"name":"GUST","level":"10 m above ground","info":"ens std dev"}
HINDEX –Heat Index (K)
1 variant
NOAA GRIB2 Table 4.2-0-1

Haines Index combines stability and moisture to estimate large fire growth potential. Higher values indicate drier, more unstable conditions favorable for fire behavior.

  • Units: K.
  • Typically used in wildfire forecasting and risk monitoring.
Level Info Horizon Introduced Selector
entire atmosphere (considered as a single layer) 6h-264h 2020-10-01
{"name":"HINDEX","level":"entire atmosphere (considered as a single layer)","info":""}
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 10% level 1h-240h 2023-01-16
{"name":"HTSGW","level":"surface","info":"10% level"}
surface 50% level 1h-240h 2023-01-16
{"name":"HTSGW","level":"surface","info":"50% level"}
surface 1h-240h 2020-10-01
{"name":"HTSGW","level":"surface","info":""}
surface 90% level 1h-240h 2023-01-16
{"name":"HTSGW","level":"surface","info":"90% level"}
surface ens std dev 1h-240h 2020-10-01
{"name":"HTSGW","level":"surface","info":"ens std dev"}
MAXREF –Maximum Radar Reflectivity (dBZ)
1 variant
NOAA GRIB2 Table 4.2-0-19

Hourly maximum simulated reflectivity at 1 km AGL captures the strongest modeled reflectivity near the surface. It is used to identify peak convective intensity and heavy precipitation cores.

  • Units: dBZ.
Level Info Horizon Introduced Selector
1000 m above ground 1h-36h 2020-10-01
{"name":"MAXREF","level":"1000 m above ground","info":""}
MAXRH –Maximum Relative Humidity (%)
1 variant
NOAA GRIB2 Table 4.2-0-1

Maximum relative humidity is the highest RH reached during the period. It can indicate peak cloud or fog potential.

  • Units: percent.
  • Higher values indicate more atmospheric moisture and greater cloud or precip potential.
Level Info Horizon Introduced Selector
2 m above ground 13h-264h 2020-10-01
{"name":"MAXRH","level":"2 m above ground","info":""}
MINRH –Minimum Relative Humidity (%)
1 variant
NOAA GRIB2 Table 4.2-0-1

Minimum relative humidity is the lowest RH reached during the period. It is used in fire‑weather and drying assessments.

  • Units: percent.
  • Higher values indicate more atmospheric moisture and greater cloud or precip potential.
Level Info Horizon Introduced Selector
2 m above ground 13h-264h 2020-10-01
{"name":"MINRH","level":"2 m above ground","info":""}
MIXHT –Mixing Height (m)
1 variant
NOAA GRIB2 Table 4.2-0-3

Mixing height is the depth of the well-mixed layer near the surface. It is widely used for dispersion, smoke, and air-quality applications.

  • Units: m.
Level Info Horizon Introduced Selector
entire atmosphere (considered as a single layer) 1h-264h 2020-10-01
{"name":"MIXHT","level":"entire atmosphere (considered as a single layer)","info":""}
PCPDUR –Precipitation Duration (hours)
1 variant
NOAA GRIB2 Table 4.2-0-1

Precipitation duration is the total time with measurable precipitation in the output period. It helps distinguish intermittent from persistent events.

  • Units: hours.
  • Accumulations represent water-equivalent depth over the output interval; rates describe intensity.
Level Info Horizon Introduced Selector
surface 12h-36h 2022-06-01
{"name":"PCPDUR","level":"surface","info":""}
RETOP –Radar Echo Top Height (m)
1 variant
NOAA GRIB2 Table 4.2-0-3

Echo top height is the altitude of the highest reflectivity in the column. It is a proxy for storm depth and convective vigor.

  • Units: m.
Level Info Horizon Introduced Selector
cloud top 1h-36h 2020-10-01
{"name":"RETOP","level":"cloud top","info":""}
RH –Relative Humidity (%)
1 variant
NOAA GRIB2 Table 4.2-0-1

Relative humidity describes how close the air is to saturation at the specified level. High values favor cloud formation.

  • Units: percent.
  • Higher values indicate more atmospheric moisture and greater cloud or precip potential.
Level Info Horizon Introduced Selector
2 m above ground 1h-264h 2020-10-01
{"name":"RH","level":"2 m above ground","info":""}
SNOWLVL –Snow Level (m)
8 variants
NOAA GRIB2 Table 4.2-0-1

Snow level is the approximate altitude where precipitation changes from rain to snow. It is useful for terrain and road-impact forecasting.

  • Units: m.
Level Info Horizon Introduced Selector
surface 5% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"5% level"}
0 m above mean sea level 1h-264h 2022-06-01
{"name":"SNOWLVL","level":"0 m above mean sea level","info":""}
surface 10% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"10% level"}
surface 25% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"25% level"}
surface 50% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"50% level"}
surface 75% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"75% level"}
surface 90% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"90% level"}
surface 95% level 1h-263h 2023-01-16
{"name":"SNOWLVL","level":"surface","info":"95% level"}
TCDC –Total Cloud Cover (%)
3 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 unknown derived fcst 37h-264h 2020-10-01
{"name":"TCDC","level":"surface","info":"unknown derived fcst"}
surface 1h-264h 2020-10-01
{"name":"TCDC","level":"surface","info":""}
surface ens std dev 1h-36h 2020-10-01
{"name":"TCDC","level":"surface","info":"ens std dev"}
THUNC –Thunderstorm Probability (%)
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":""}
TMAX –Maximum Temperature (K)
2 variants
NOAA GRIB2 Table 4.2-0-0

Maximum temperature is the highest temperature reached during the output period. It is commonly used for heat stress and daily extremes.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground 12h-264h 2020-10-01
{"name":"TMAX","level":"2 m above ground","info":""}
2 m above ground ens std dev 12h-264h 2020-10-01
{"name":"TMAX","level":"2 m above ground","info":"ens std dev"}
TMIN –Minimum Temperature (K)
2 variants
NOAA GRIB2 Table 4.2-0-0

Minimum temperature is the lowest temperature reached during the output period. It is commonly used for frost and cold-stress assessment.

  • Units: K.
Level Info Horizon Introduced Selector
2 m above ground 12h-264h 2020-10-01
{"name":"TMIN","level":"2 m above ground","info":""}
2 m above ground ens std dev 12h-264h 2020-10-01
{"name":"TMIN","level":"2 m above ground","info":"ens std dev"}
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 1h-264h 2020-10-01
{"name":"TMP","level":"2 m above ground","info":""}
2 m above ground ens std dev 1h-264h 2020-10-01
{"name":"TMP","level":"2 m above ground","info":"ens std dev"}
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 1h-167h 2024-04-16
{"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 1h-167h 2024-04-16
{"name":"TPWSPD","level":"10 m above ground","info":""}
TRWDIR –Tropical Wind Direction (degrees)
1 variant
NOAA GRIB2 Table 4.2-0-2

Tropical wind direction is the direction of the tropical wind vector used in cyclone guidance.

  • Units: degrees.
Level Info Horizon Introduced Selector
entire atmosphere (considered as a single layer) 1h-264h 2022-06-01
{"name":"TRWDIR","level":"entire atmosphere (considered as a single layer)","info":""}
TRWSPD –Tropical Wind Speed (m/s)
1 variant
NOAA GRIB2 Table 4.2-0-2

Tropical wind speed is the magnitude of the tropical wind vector. It is often used in cyclone diagnostics.

  • Units: m/s.
Level Info Horizon Introduced Selector
entire atmosphere (considered as a single layer) 1h-264h 2022-06-01
{"name":"TRWSPD","level":"entire atmosphere (considered as a single layer)","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"}
TURB –Turbulence Index (unitless)
1 variant
NOAA GRIB2 Table 4.2-0-19

Turbulence index is a diagnostic measure of aviation turbulence. Higher values indicate increased turbulence risk along flight routes.

  • Units: unitless.
Level Info Horizon Introduced Selector
surface - 1372 m above ground 1h-259h 2020-10-01
{"name":"TURB","level":"surface - 1372 m above ground","info":""}
VIL –Vertically Integrated Liquid (kg/m^2)
1 variant
NOAA GRIB2 Table 4.2-0-1

Vertically‑integrated liquid water is the total column liquid water content. It is used as a proxy for precipitation intensity and hail potential.

  • Units: kg/m^2.
Level Info Horizon Introduced Selector
entire atmosphere 1h-36h 2020-10-01
{"name":"VIL","level":"entire atmosphere","info":""}
VIS –Visibility (km)
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 1h-84h 2020-10-01
{"name":"VIS","level":"surface","info":""}
VRATE –Vertical Velocity (m/s)
1 variant
NOAA GRIB2

Vertical rate of change is a model diagnostic of vertical motion tendency for the represented variable. It helps identify regions of ascent or subsidence changes.

  • Units: 1/s.
Level Info Horizon Introduced Selector
entire atmosphere (considered as a single layer) 1h-264h 2020-10-01
{"name":"VRATE","level":"entire atmosphere (considered as a single layer)","info":""}
WDIR –Wind Direction (degrees)
4 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
surface - 610 m above ground 1h-36h 2020-10-01
{"name":"WDIR","level":"surface - 610 m above ground","info":""}
30 m above ground 1h-264h 2020-10-01
{"name":"WDIR","level":"30 m above ground","info":""}
80 m above ground 1h-264h 2020-10-01
{"name":"WDIR","level":"80 m above ground","info":""}
10 m above ground 1h-264h 2020-10-01
{"name":"WDIR","level":"10 m above ground","info":""}
WIND –Wind Speed (m/s)
5 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
surface - 610 m above ground 1h-36h 2020-10-01
{"name":"WIND","level":"surface - 610 m above ground","info":""}
30 m above ground 1h-264h 2020-10-01
{"name":"WIND","level":"30 m above ground","info":""}
80 m above ground 1h-264h 2020-10-01
{"name":"WIND","level":"80 m above ground","info":""}
10 m above ground 1h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":""}
10 m above ground ens std dev 1h-264h 2020-10-01
{"name":"WIND","level":"10 m above ground","info":"ens std dev"}

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