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ICON Convection Forecast 🌙

Run: 26.10.2026 D2 09Z / RUC 11Z / EU 06Z

DWD · ECMWF · Open Flightmaps · CARTO / OSM · openAIP

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+0:00
0h 115h
CAPE
100-250 J/kg
250-500 J/kg
500-1000 J/kg
1000-1500 J/kg
1500-2000 J/kg
2000-2500 J/kg
2500-3000 J/kg
> 3000 J/kg

Attribution

Weather data: DWD (ICON-D2 & ICON-EU) · ECMWF (IFS & AIFS)
Base map: Open Flightmaps
Overview map: CARTO / OpenStreetMap
Obstacles: openAIP · CC BY-NC 4.0 (filtered)

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Convection (CAPE · CIN · Shear)

Three switchable layers for the thunderstorm picture — pick one with the Layer selector above the legend.

CAPE (Convective Available Potential Energy, J/kg) — the thunderstorm fuel. <100 = stable, 100–500 = isolated showers possible, 500–1,000 = ordinary summer storms, 1,000–2,000 = strong storms with hail risk, >2,000 = severe / supercell environment.

CIN (Convective Inhibition, J/kg) — the cap that holds storms down. CAPE alone doesn't fire storms; strong CIN can keep even 3,000 J/kg quiet until it erodes in the afternoon, then releases explosively. Low CAPE + near-zero CIN can still pop showers. Read CAPE and CIN together.

Shear (deep-layer bulk shear, kt) — the magnitude of the wind change between the surface (10 m) and ~500 hPa (≈FL180): |V₅₀₀ − V₁₀ₘ|. It is not a wind speed you fly in and not a surface gust — it's how much the wind veers/strengthens with height. Shear decides how storms organize and only matters where there's CAPE: 20–35 kt supports longer-lived multicell clusters, 35–40 kt organized storms, >40 kt rotating supercells. High shear with no CAPE is inert — always cross-check the CAPE layer at the same time and place.

Use the CAPE/CIN meteogram panel for hour-by-hour detail at a specific airfield.

Learn more about this map →