Route cross section

Sources & methods

Model

GFS (NOAA/NCEP), cycle 2026110218, +0 h, valid 2026-11-02 18:00Z — GFS 0.5°, 0.5° grid (30 NM), 60 points along the great circle.

Vertical

33 levels, every 500 m from the surface to 16 km, interpolated linearly in height between the model’s 21 pressure levels (1000–100 hPa). Temperatures in °C, wind in kt, altitudes in metres above MSL.

Derived here

Cloud is the model’s humidity and cloud water turned into oktas (Sundqvist), not observed layers. Icing and turbulence are indices built from temperature, humidity, wind shear and vertical velocity — proxies, not official diagnoses. Freezing level and tropopause come from the same column.

Terrain

SRTM through the AWS Terrain Tiles, 0.02° (≈2.2 km), Europe — read in row bands from R2, not the whole file.

SIGMET

ICAO OPMET advisories. The area comes from the feed’s polygon or, when the feed only carries text, from the advisory itself; levels are the ones it declares. 1 area cross this route at this hour; an undeclared top is drawn as FL0-? with a dashed border.

NOTAM

10 NOTAMs with a position and vertical limits within 5 NM of the corridor (FAA AIXM Q-line). A band is drawn only when the ceiling is really declared; the rest are marks on the surface.

What it is not

Nothing is extrapolated: a part of the route without model data is hatched, not filled. Outside Europe the 1.0° grid is too coarse for local terrain (a ridge two grid cells wide will not show). This is a briefing aid, not a flight-planning authority: check the official charts, TAFs and SIGMETs before flight.

Freshness

Four GFS cycles a day (00, 06, 12, 18 UTC), three-hour steps to +72 h. The stamp above is the cycle and validity this section was drawn from; a cached copy lives at the edge for 30 minutes.