The Suwałki Gap is the 65-kilometre land corridor linking Poland to Lithuania. It is the only land connection between the three Baltic states and the rest of the European Union — to its east is Belarus, to its west is the Russian exclave of Kaliningrad. For anyone monitoring the EU's eastern frontier, the gap is a compact geographic test case: two hostile borders, one narrow passage, and a wind field that frequently moves air from one side to the other.
This post walks through how to read the wind field across the gap in AirVeto, what the orange border segments mean, and — importantly — what this data does and does not tell you.
What you see on the map
Open AirVeto over Poland or Lithuania and you will see vector arrows drawn at a regular grid across the corridor. Each arrow encodes two values: direction (where the wind is going) and speed (arrow length, with a colour ramp from green to orange). The default altitude is 3,000 m — selectable up to 5,000 m for higher-layer analysis.
The wind vectors come from Open-Meteo, which blends the ECMWF and GFS global models and refreshes hourly. Over a mid-latitude corridor like the Suwałki Gap, model resolution is adequate for situational awareness, but it is not a nowcast — there is always some lag between the physical wind field and the rendered vectors.
What the orange borders mean
A border segment turns orange when the current wind vector is crossing into the EU across that segment, within 85° of the border-normal. In practical terms: if you see an orange segment on the Belarus side of Lithuania, wind is actively flowing from Belarus into Lithuania at the rendered altitude — right now.
A few properties worth internalising:
- It is a directional filter, not a forecast. Orange tells you the wind is currently inflowing. If the synoptic pattern shifts in six hours, the same segment may flip green. Re-check the map regularly when tracking an evolving situation.
- It is altitude-specific. Wind at 500 m and wind at 3,000 m can differ by tens of degrees in direction, especially around frontal passages. If you care about low-level drift (weather balloons, for example), switch to 500 m. If you care about mid-altitude transport, 3,000 m is reasonable.
- It does not imply that anything is actually crossing. Orange means the wind could carry airborne objects across. Whether anything is airborne is a separate question, answered by ADS-B for aircraft or by surveillance you do not have.
Where the gap behaves differently than you might expect
Two geographic details matter more than they first appear:
1. The gap is narrow enough that a single weather system dominates it. When a low pressure system passes over central Europe, the wind rotation is similar across the entire corridor. You rarely see the northern end and southern end in genuinely different regimes.
2. Kaliningrad's wind field is usually correlated with Poland's northeast. Because Kaliningrad is a small territory, its synoptic wind is effectively whatever is happening over the adjacent Polish-Lithuanian coast. If you want to reason about airborne movement from Kaliningrad, look at the Polish side of the gap rather than trying to read vectors inside the exclave itself.
What this is useful for
Concretely, we see the Suwałki Gap view used for:
- Contextualising reported incidents. When a drone or balloon incident is reported along the Polish-Belarusian or Lithuanian-Belarusian border, the first question for an analyst is "was the wind even pointing that way?" The map answers it in one glance. Recent examples reconstructed from the archive: the Vilnius Airport closure of 9–10 April 2026, the 28 January 2026 Vilnius incursion at 7 km with 55 km/h wind from the south, and the 7 February 2026 Druskininkai seven-balloon day directly on the gap's Lithuanian border.
- Forward-checking claims. Open-source claims about cross-border air activity sometimes rest on implicit assumptions about wind direction. Checking the rendered field at the claimed time and altitude is a 20-second sanity check.
- Spotting inflow windows. Extended periods where several consecutive border segments are orange represent "inflow windows" when cross-border drift is physically possible. These don't show up on a country-by-country weather app because none of them visualise the border crossing itself. The Suwałki Gap location hub links the current live view.
What this is not useful for
- Aviation or safety-critical decisions. The Open-Meteo model is a model. It has error bars. Do not plan a flight or an interdiction around it.
- Pinpoint trajectory prediction. We do not advertise an object-level Lagrangian integration. For specific trajectory work, use a proper dispersion model (HYSPLIT, FLEXPART) with the right meteorological inputs.
- Information about objects not on public feeds. If something is not transponding on ADS-B or AIS, it will not appear on AirVeto. The wind field is the only information we infer; everything else is what the public feeds report.
How to check yourself
Every claim above can be verified against the underlying sources:
- Wind vectors — cross-reference the Open-Meteo API directly at a coordinate of your choice.
- Aircraft positions — compare to the ADS-B receiver network (Flightradar24, ADSB.fi, or adsb-exchange).
- Baltic vessels — cross-check with the Digitraffic AIS feed for Finnish waters or with MarineTraffic.
- Satellite positions — compare SGP4 propagation from public TLE (CelesTrak) at a given epoch.
The goal of AirVeto is not to be the authoritative source for any of these feeds. It is to show them together, focused on the EU's eastern frontier, in one place — so the analyst's cognitive load is geographic composition, not data wrangling.
AirVeto is a live wind map for the EU's eastern frontier. Open the live map or read more on the About page.