GribStream

National Blend of Models Parallel — Oceanic core grid

GribStream Code: nbmparoc

Other NBM parallel core grids: nbmpar, nbmparak, nbmparhi, nbmparpr, nbmpargu

Operational counterpart: nbmoc

Description

Experimental public parallel feed for NBM v5 on the oceanic core grid, kept separate from operational NBM Oceanic for marine validation workflows.

The upstream bucket is noaa-nbm-para-pds. GribStream keeps the parallel feed under dedicated dataset codes so you can compare it to the operational NBM family instead of swapping existing archives underneath current workflows.

NBM v5 is more than a parameter refresh. NOAA's July 15, 2025 change notice highlights one especially visible change for API users: most hourly guidance extends from 36 hours to 48 hours, which matters if you use NBM as an hourly time series rather than just a daily summary.

NOAA also revised the blend itself, including more quantile-mapped processing for key temperature, moisture, and precipitation guidance, a percentile-picking approach for deterministic wind and gusts, higher-resolution ECMWF and Canadian inputs, and ECAIFS as a new input for several core fields. See PNS 25-45, winter configuration notes, and NBM Versions.

For the Oceanic domain, NOAA's v5 notes call out probabilistic QM bias-corrected wind speed and gust guidance, updated bias-corrected temperature, dew point, and sky-cover products, and a significant-wave-height bias correction that moves to QM and a much larger input set.

Detail

Archive window: Last 5 days
Source: NOAA NBM parallel public bucket on AWS Open Data.
Coverage: Oceanic core grid.
Update cadence: Hourly cycles.
Lead time: 1-264 hours where published, with most hourly guidance extending through hour 48 in NBM v5.
Resolution: ~10 km.
Status: Public parallel feed currently serving NBM v5.
Experimental: This parallel dataset is experimental. Fields, cadence, and retention can change.
Technical references: PNS 25-45, Winter v5.0 configuration notes, NBM Versions.

Parameters

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

APTMP –Apparent Temperature (K)

1 variant

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	2026-04-15	`{"name":"APTMP","level":"2 m above ground","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`	`50% level`	2h-264h	2026-04-15	`{"name":"DPT","level":"2 m above ground","info":"50% level"}`

FRZSPR –Freezing Spray Indicator (boolean)

1 variant

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	2026-04-15	`{"name":"FRZSPR","level":"surface","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`	`50% level`	2h-264h	2026-04-15	`{"name":"GUST","level":"10 m above ground","info":"50% level"}`

PWAT –Precipitable Water (kg/m^2)

9 variants

Precipitable water is the total column water vapor from the surface to the top of the atmosphere. It is a key moisture indicator.

Units: kg/m^2.

Level	Info	Horizon	Introduced	Selector
`entire atmosphere (considered as a single layer)`		1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":""}`
`entire atmosphere (considered as a single layer)`	`10% level`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"10% level"}`
`entire atmosphere (considered as a single layer)`	`50% level`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"50% level"}`
`entire atmosphere (considered as a single layer)`	`90% level`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"90% level"}`
`entire atmosphere (considered as a single layer)`	`prob >12.7`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"prob >12.7"}`
`entire atmosphere (considered as a single layer)`	`prob >25.4`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"prob >25.4"}`
`entire atmosphere (considered as a single layer)`	`prob >38.1`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"prob >38.1"}`
`entire atmosphere (considered as a single layer)`	`prob >50.8`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"prob >50.8"}`
`entire atmosphere (considered as a single layer)`	`prob >63.5`	1h-264h	2026-04-15	`{"name":"PWAT","level":"entire atmosphere (considered as a single layer)","info":"prob >63.5"}`

TCDC –Total Cloud Cover (percent)

2 variants

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	2026-04-15	`{"name":"TCDC","level":"surface","info":""}`
`surface`	`ens std dev`	2h-264h	2026-04-15	`{"name":"TCDC","level":"surface","info":"ens std dev"}`

THUNC –Thunderstorm Probability (percent)

1 variant

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	2026-04-15	`{"name":"THUNC","level":"entire atmosphere","info":""}`

TMP –Temperature (K)

2 variants

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	2026-04-15	`{"name":"TMP","level":"2 m above ground","info":"50% level"}`
`surface`		2h-264h	2026-04-15	`{"name":"TMP","level":"surface","info":""}`

TPWDIR –Total Precipitable Water Transport Direction (degrees)

1 variant

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	2026-04-15	`{"name":"TPWDIR","level":"10 m above ground","info":""}`

TPWSPD –Total Precipitable Water Transport Speed (m/s)

1 variant

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	2026-04-15	`{"name":"TPWSPD","level":"10 m above ground","info":""}`

TSTM –Thunderstorm Indicator (boolean)

1 variant

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	2026-04-15	`{"name":"TSTM","level":"surface","info":"probability forecast"}`

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`	`50% level`	2h-264h	2026-04-15	`{"name":"VIS","level":"surface","info":"50% level"}`

WDIR –Wind Direction (degrees)

6 variants

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	2026-04-15	`{"name":"WDIR","level":"10 m above ground","info":""}`
`10 m above ground`	`50% level`	5h-264h	2026-04-15	`{"name":"WDIR","level":"10 m above ground","info":"50% level"}`
`10 m above ground`	`75% level`	5h-264h	2026-04-15	`{"name":"WDIR","level":"10 m above ground","info":"75% level"}`
`10 m above ground`	`90% level`	5h-264h	2026-04-15	`{"name":"WDIR","level":"10 m above ground","info":"90% level"}`
`30 m above ground`	`50% level`	5h-264h	2026-04-15	`{"name":"WDIR","level":"30 m above ground","info":"50% level"}`
`80 m above ground`	`50% level`	5h-264h	2026-04-15	`{"name":"WDIR","level":"80 m above ground","info":"50% level"}`

WIND –Wind Speed (m/s)

8 variants

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	2026-04-15	`{"name":"WIND","level":"10 m above ground","info":""}`
`10 m above ground`	`10% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"10 m above ground","info":"10% level"}`
`10 m above ground`	`25% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"10 m above ground","info":"25% level"}`
`10 m above ground`	`50% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"10 m above ground","info":"50% level"}`
`10 m above ground`	`75% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"10 m above ground","info":"75% level"}`
`10 m above ground`	`90% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"10 m above ground","info":"90% level"}`
`30 m above ground`	`50% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"30 m above ground","info":"50% level"}`
`80 m above ground`	`50% level`	2h-264h	2026-04-15	`{"name":"WIND","level":"80 m above ground","info":"50% level"}`

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