Flying Outside the US
PlaneWX supports flights to and from international airports worldwide. Here's what to expect — and what to supplement — when planning a non-US flight.
What Works Everywhere
PlaneWX is built on the global ICAO airport system. Any four-letter ICAO code — whether it's EGLL, LFPG, MMMX, or YSSY — can be entered as a departure or arrival airport. The following capabilities work for all international airports:
METARs and TAFs
Aviation weather observations (METARs) and terminal forecasts (TAFs) are retrieved from NOAA's Aviation Weather Center, which aggregates ICAO-standard reports from airports worldwide. If an international airport files a TAF with ICAO, PlaneWX can read it.
ECMWF Model Winds & Extended Forecasts
For flights outside the continental US, PlaneWX uses ECMWF (European Centre for Medium-Range Weather Forecasts) as the primary global model — widely regarded as the world's most accurate medium-range model. ECMWF provides winds aloft, temperature, and icing guidance for any location on Earth. For European routes specifically, two additional high-resolution DWD models (ICON EU + ICON D2) are layered on top — see below.
International SIGMETs
SIGMET advisories for severe turbulence, severe icing, volcanic ash, and tropical cyclones are available worldwide through NOAA's international SIGMET feed. PlaneWX checks your route corridor against active SIGMETs and flags any that intersect your flight path.
Regulatory Context
When both your departure and arrival airports are outside FAA jurisdiction (i.e., not K-prefix, PA-prefix, PH-prefix, or US territories), PlaneWX automatically adds a regulatory context block to your briefing. This covers applicable standards such as EASA (Europe), Transport Canada, and general ICAO Annex 2 VFR minima — so you know which rule set applies, not just the weather.
Tropical Cyclone & Orographic Hazard Detection
For international routes, PlaneWX checks for active tropical cyclones within 500 NM of your flight path, and detects known orographic wind hazards — Föhn, Bora, Mistral, Tramontane, Chinook/mountain wave, and others — based on your departure or arrival region. These appear in your briefing when relevant.
International Navaid & GPS Fix Resolution
PlaneWX includes a worldwide navaid database covering VORs, NDBs, and DMEs sourced from OurAirports. For 5-letter GPS waypoint fixes (e.g., NEMOS, GEVEA, LUTIX), PlaneWX queries the AIRAC.net aviation data service and caches results locally. US navaids remain authoritative from FAA NASR data and are never overwritten by international sources.
What's Better for European Routes
European pilots flying in ICAO airspace get additional capabilities beyond the global baseline — including two high-resolution regional models and a dedicated route weather cross-section chart.
ICON EU + ICON D2 High-Resolution Models
For routes involving European airports, PlaneWX adds two models from Germany's national weather service (DWD): ICON EU (7 km, all of Europe) and ICON D2 (2 km, central Europe). These run alongside GFS and ECMWF, giving European briefings up to four independent icing models vs. two for other international routes. ICON D2's 2 km grid captures terrain-induced effects — Alpine lenticulars, Föhn winds, valley fog — that coarser global models can miss.
ICON EU
7 km · 4× daily · Europe + N. Africa
ICON D2
2 km · 8× daily · Central Europe
Route Weather Cross-Section (GRAMeT Chart)
European briefings automatically include an interactive GRAMeT cross-section chart — a vertical slice of the atmosphere along your exact route. It shows icing, cloud tops, turbulence, and temperature at every altitude from departure to destination, generated in real time by Autorouter using ICON EU, ICON D2, GFS, and ECMWF data. The chart is anchored to your actual departure time, cruise altitude, and ETE, so what you see is specific to your flight — not a generic area forecast.
The GRAMeT chart appears automatically in your briefing for European routes — no additional setup required.
Runway Condition Codes (RWYCC)
International airports using ICAO Annex 14 runway state reporting (embedded in METAR as an 8-digit runway state group) are parsed and translated into the standard RWYCC 0–6 scale:
| RWYCC | Condition | Braking Action |
|---|---|---|
| 6 | Dry | NIL concern |
| 5 | Wet / Good | Good |
| 4 | Wet / Good-to-Medium | Good to Medium |
| 3 | Slush / Medium | Medium |
| 2 | Ice / Medium-to-Poor | Medium to Poor |
| 1 | Ice / Poor | Poor |
| 0 | Ice / Nil | NIL braking — runway unusable |
When a SNOCLO (runway closure) condition is detected in the METAR, PlaneWX marks the briefing as a hard NO-GO.
Data Gaps & Limitations
PlaneWX is deeply optimized for the US national airspace. Outside the US, some products are not available or are less detailed:
No G-AIRMETs or WPC Products
Graphical AIRMETs (G-AIRMETs), Weather Prediction Center (WPC) discussions, and area forecasts are US-only products. They are automatically suppressed from your briefing when planning routes outside the continental US, so you won't see empty or misleading sections.
Proxy Weather Station Coverage
Many smaller international airports file METARs inconsistently or not at all. When a direct METAR isn't available, PlaneWX uses the nearest airport with weather service as a proxy — just as it does for small US fields. The briefing will note when proxy data is in use. Proxy weather may be less representative in mountainous or coastal terrain.
No NOTAMs
PlaneWX does not currently pull international NOTAMs. US domestic NOTAM integration is in development. Always check NOTAMs through your national AIS (e.g., EUROCONTROL NOTAMam, ICAO NOTAMsearch, or your country's AIS).
GO Score Calibration
The GO Score algorithm was developed and validated against thousands of US flights. While the underlying weather analysis applies globally, the score thresholds and penalty weights are calibrated for FAA airspace. Treat the international GO Score as a strong indicator, not a certified measurement.
No Airspace or Regulatory Filing Guidance
PlaneWX provides weather and risk analysis, not flight planning or regulatory compliance guidance. For international flights, consult your national AIP (Aeronautical Information Publication), your country's CAA/ANSP, and appropriate filing services (e.g., EUROCONTROL, Nav Canada, SENEAM).
Alaska, Hawaii & US Territories
Flights within Alaska (PA- prefix), Hawaii (PH- prefix), Puerto Rico (TJ/TI- prefix), and Guam/Pacific territories (PG/PW- prefix) are treated as US FAA jurisdiction. You'll get full US domestic analysis — G-AIRMETs, WPC products, and FAA regulatory context — without the international caveats. The regulatory context block only activates for routes entirely outside FAA-administered airspace.
Always Supplement with Local Sources
No matter how capable the tool, international aviation demands local knowledge. Before any international flight:
- Check NOTAMs through your national AIS portal or EUROCONTROL NOTAMam
- Review the AIP (Aeronautical Information Publication) for procedural requirements
- Obtain a briefing from the local MET office or ANSP when required by local regulations
- Confirm you have the correct charts, procedures, and radio frequencies for the foreign airspace
- Verify fuel, customs, and handling requirements at your destination
- Ensure your aircraft documentation and pilot certificates are valid for the country you're entering
Proxy Weather Stations
How PlaneWX fills in weather data for airports without direct METAR service.
Data Accuracy & Confidence
How we validate our forecasts and what the accuracy numbers mean for your planning.
Multi-Model Icing Analysis
How ICON EU, ICON D2, GFS, and ECMWF work together for European icing analysis.