Severe wind probability (%).
GribStream
GribStream Code: spcwind4hr
Scheduled source retirement: NOAA plans to retire this HREF-based SPC product when SPC_POST v3 starts, on or after 14 October 2026 with the 12 UTC cycle. Significant weather can delay the change. SCN26-77.
Migration target: grefs · WINDPROB. The new products use different inputs and calibration. Select the replacement dataset and the appropriate probability period in your queries. Existing data expires under the current two-day retention policy.
SPC HREF calibrated severe wind probability estimates the chance of damaging convective wind over four-hour windows. It is designed for severe-thunderstorm risk, not ordinary gradient wind, so it is most useful when squall lines, bowing segments, downbursts, or organized convection are the concern.
SPC's calibrated severe-wind framework combines storm-scale HREF information with larger-scale environmental ingredients from ensemble guidance and relates those combinations to historical severe reports. That calibration helps turn raw storm attributes into an operational probability field that can be used for thresholds, ranking, and alert workflows.
This dataset is useful for utilities, transportation, event safety, emergency management, insurance exposure, and logistics applications where convective wind damage matters. Pair it with HRRR and HRRR sub-hourly for storm evolution, and with SPC Hail 4h and SPC Tornado 4h for broader severe-hazard context.
WINDPROBClick a parameter to reveal variants in a compact table with ready-to-copy JSON selectors.
Severe wind probability (%).
| Level | Info | Horizon | Introduced | Selector |
|---|---|---|---|---|
surface |
prob >0 |
4h-36h | 2 days ago |
{"name":"WINDPROB","level":"surface","info":"prob >0"}
|
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