Thunderstorm probability (%).
GribStream
spctstm1hr
SPC HREF 1-hour thunderstorm probability is short-fuse convective guidance from NOAA's Storm Prediction Center post-processing stream. It focuses on the probability of thunderstorm occurrence over the next hour, making it a useful dataset when a workflow needs rapid updates around developing convection rather than broad daily outlook categories.
The product is built from High-Resolution Ensemble Forecast information and SPC calibration methods. It is designed to turn storm-scale model signals into a direct probability field that can be queried by point or area. That makes it practical for outdoor-event operations, utility crews, aviation ramp planning, lightning-aware safety systems, transportation dispatch, and automated alert prioritization.
Use this one-hour dataset when timing matters. It complements the four-hour SPC thunderstorm and severe-weather probability datasets when you need a sharper near-term view, and it pairs naturally with HRRR, HRRR sub-hourly, and RAP for storm initiation and boundary monitoring.
TSTMThunderstorm probability (%).
| Level | Info | Horizon | Introduced | Selector |
|---|---|---|---|---|
surface |
prob >0 |
1h-48h | 2 days ago |
{"name":"TSTM","level":"surface","info":"prob >0"}
|