Visiting from somewhere hot? Here’s what these numbers mean.
What’s a midge, and why does wind matter?
Midges are tiny biting insects that thrive in still, humid conditions typical of the Scottish summer. They can’t fly in wind above about 6mph. That’s why every forecast on this page starts with wind speed: if it’s breezy enough, midges can’t operate, and you’re clear to head outside.
What does SAFE / WARNING mean?
SAFE means wind is at or above the 6mph flight ceiling — midge activity is mechanically neutralised at that location. WARNING means wind is under 6mph or calm, and midges may be active there. Use the card colours as a quick scan: green-border cards are safe zones, amber-border cards need caution.
What’s the MPI number?
Midge Pressure Index — a 0–10 score combining wind, temperature, and humidity. Higher numbers mean more favourable midge conditions. You’ll see it in the detail panel if you click a location. On the matrix table, MPI is shown only for WARNING locations (wind under 6mph), where it actually tells a useful story.
What should I do at a WARNING location?
Timing helps. Midges are most active around dawn and dusk, and in sheltered spots with low air movement. If you’re heading into a WARNING zone, carry repellent, cover exposed skin, and aim for windier periods or open, exposed ridges where the breeze keeps them grounded. The “+3 Hours” toggle above can show you whether wind is expected to pick up later.