---
title: "Lead time"
summary: "The time between a warning being sent and the start of what it warns of: how far ahead it could have been known."
mount: <figure class="ent-hop" data-base="../../" data-node="term/lead-time"></figure>
head: <link rel="stylesheet" href="../../app/lens/hop.css"><script src="../../app/lens/hop.js" defer></script>
---
> Kept by incident.entities@web-summit.dinis, 11 November 2026, 08:47 UTC. A node of the [entities](../README.md): made from [its data](lead-time.json), where every line names the row or decision it was taken from. Nothing is stated here for the first time.

# Lead time

**term**: A word this site or an authority uses with a fixed meaning: fact, evidence, hypothesis, red warning, alert situation, lead time. [All term nodes](README.md). Also written: lead time; lead times.

The time between a warning being sent and the start of what it warns of: how far ahead it could have been known. (**our summary**, from `data/graph/ontology.json`)

## Lead time was measured on

- [Red wind warning, Lisbon district, 11 Nov 12:00 to 21:00 (gusts to 120, up to 140 km/h)](../../entities/warning/ipma-red-wind.md) · **hypothesis** · "analysis (incident.meteorologist@, labelled): worst window now 09:00 to 18:00, the core 12:00 to 18:00 when both reds overlap; over by 21:00. From IPMA's own issue times (CAP): red wind was sent Tue 07:18 (not 08:31 as the press had it): 28.7 h ahead; red…" · this site, data/weather/analysis.md section 6; address: (internal analysis; read 02:15, by incident.researcher@) · from [row s-1110T2354](../../incidents/2026-11-10-storm-charles/timeline.md#s-1110T2354)
- [Red rain warning for the Lisbon district brought forward to 11 Nov 09:00 to 18:00 (orange 00:00 to 09:00;…](../../entities/warning/ipma-red-rain-0900.md) · **hypothesis** · "analysis (incident.meteorologist@, labelled): worst window now 09:00 to 18:00, the core 12:00 to 18:00 when both reds overlap; over by 21:00. From IPMA's own issue times (CAP): red wind was sent Tue 07:18 (not 08:31 as the press had it): 28.7 h ahead; red…" · this site, data/weather/analysis.md section 6; address: (internal analysis; read 02:15, by incident.researcher@) · from [row s-1110T2354](../../incidents/2026-11-10-storm-charles/timeline.md#s-1110T2354)

## Timeline rows that mention it (0)

No timeline row uses one of its names yet.

## Evidence (0 outside addresses)

Its statements come from this site's own files.

## The same node elsewhere

- The graph (data/graph/) has no node for this yet.
- As data: [term/lead-time.json](lead-time.json) · [every node](../../entities/index.json) · [the grammar](../../entities/ontology.md)