Paragliding Weather Forecast: The 15-Minute Pilot Briefing

A paragliding weather forecast answers five questions: how strong is the wind at flying height, how lively is the air, what are the clouds doing, is a front or rain on the way, and do the models agree? Work through them in that order and you have a complete pilot briefing in about 15 minutes. The reference numbers, as of July 2026: under 20 km/h (12 mph) suits beginners, around 30 km/h (18 mph) grounds most pilots, and gusts more than 10 km/h above the average are a red flag.

One rule outranks everything below. A forecast is decision support, never clearance to fly — when in doubt, don't launch.

Minute 0–3: wind — how strong is too strong?

Wind cancels more flights than anything else, so it goes first. Read two numbers: surface wind at the site, and wind at flying height — the 900 hPa level on most forecast pages, roughly 1,000 m above sea level. For higher alpine launches, add 850 hPa, about 1,500 m.

The gap between those two numbers is the classic trap. A sleepy 8 km/h in the valley means little if 900 hPa shows 35 km/h: you meet that upper wind within minutes of launching, and it churns the lee side of every ridge on the way up.

Why roughly 30 km/h grounds almost everyone: a paraglider flies at about 38 km/h at trim speed. In a 30 km/h headwind you advance at walking pace; anything stronger and you drift backwards, with the terrain — not you — choosing the landing.

Pilot level	Steady wind	Gusts	The usual call
Student or newly licensed	0–15 km/h (0–9 mph)	Within a few km/h of the mean	Fly under school or club supervision
Beginner, first seasons	Up to 20 km/h (~12 mph)	Less than 10 km/h above the mean	The comfort zone — stay conservative
Intermediate and up	20–25 km/h (12–16 mph)	Less than 10 km/h above the mean	Depends on site and wing; ask locals
Everyone	Around 30 km/h (18 mph) and above	Any	Most pilots stay on the ground

Then apply the gust rule: subtract the mean wind from the forecast gusts. A spread wider than 10 km/h means snappy, turbulent air near the ground — "14 gusting 27" reads mild on a phone screen and is anything but, because that spread is exactly what deflates wings close to terrain.

These are planning limits, not permissions. Your school's numbers, the site rules and the local club override this table every time.

Minute 3–6: thermals and stability

Lapse rate is a simple idea wearing jargon: how quickly the air cools as you climb through it. When it cools fast, warm bubbles keep rising — unstable air, strong thermals. When it cools slowly, or warms with height (an inversion), the air is stable and lift stays weak.

You rarely need the raw number, because soaring forecasts translate it into climb rates and usable height. What you must check is whether instability comes paired with moisture. That combination means overdevelopment: innocent morning cumulus that keep towering until they become afternoon thunderstorms. If the forecast flags overdevelopment or storm risk, plan to be packed up early — a storm's gust front strikes many kilometres ahead of the rain.

Thermals also follow a clock. Mornings are mild — the learning window. Between 13:00 and 15:00 the day peaks: strongest climbs, roughest air, best left to experienced pilots. Toward evening the air often smooths into the glass-off, a wide band of gentle lift as the day's heat releases.

Minute 6–8: what the clouds are telling you

Clouds are the part of the forecast you can see. Four signals cover most flying days:

• Friendly cumulus. Flat base, crisp white top, each one living 20–30 minutes — building while its thermal feeds it, fraying once the thermal dies. Scattered cumulus with plenty of blue between them mark a classic flying day.
• Cumulus turning dangerous. Towers growing taller than they are wide, bases darkening and spreading, hard cauliflower edges. That is congestus on its way to cumulonimbus — and if it is happening before noon, the whole afternoon is suspect.
• Lenticulars. Smooth, lens-shaped clouds hanging motionless over peaks mean mountain wave: powerful wind aloft, even when launch feels calm. A classic ground-the-gliders sign.
• Cirrus shields. A milky high veil cuts solar heating, and thermals wither beneath it. Thickening cirrus is also often the first calling card of an approaching front — tomorrow may be worse than today.

Minute 8–10: fronts and pressure

Nobody flies through a front; the wind shift and squalls make that decision for you. The subtle trap is the day after a cold front. Post-frontal days — north flow in the Alps — look magnificent: scrubbed blue sky, endless visibility. But the air behind the front stays fast-moving and cold, so the gradient wind is strong and the thermals rip.

Strong but rowdy is the honest label for those days. Give the air a day to settle, or pick a sheltered site with local advice.

High pressure is the friendliest pattern, with one catch. A high that sits for days builds an inversion, a warm lid overhead: the air below turns hazy and stable, and thermals hit the lid and stop. Expect smooth flying, modest climbs and summits that stay out of reach.

Minute 10–11: the rain rule

Wet wing, no flight — the simplest rule in the sport. Water adds weight and disturbs the airflow across the leading edge, and a rain-soaked paraglider can slip into a deep stall: still inflated, descending steeply. Showers also push gust fronts and cold sinking air ahead of themselves.

So the rule extends forward in time. Don't launch with rain approaching, and if showers are forecast for the afternoon, set a hard land-by time in the morning. Drizzle counts.

Minute 11–13: which weather model should you trust?

A weather model chops the atmosphere into grid boxes and computes each one, so box size decides what the model can see. Global models — ECMWF, GFS, the Met Office global model at about 10 km in mid-latitudes — average an entire massif into a couple of boxes. They are excellent for the multi-day trend and blind to your valley wind.

High-resolution regional models shrink the box to terrain scale: AROME at 1.3 km over France (Météo-France), ICON-D2 at 2.2 km over Germany, Austria and Switzerland (DWD), UKV at 1.5 km over the UK and Ireland (Met Office), and HRRR at 3 km across the US (NOAA). At that scale a model starts to resolve what pilots actually fly in — valley breezes, ridge acceleration, convergence lines. Their limit is reach: they run a day or two ahead, after which you fall back on the global trend.

The professional habit is comparing at least two independent models. Agreement is confidence: if AROME and ICON-D2 both put 15 km/h north-west on your site at 14:00, believe it. If one says 12 and the other says 28, the honest forecast is undecided — plan two options for the day.

That comparison step is the one OutDare automates. Each of its 13,900+ sites carries a 7-day forecast built on the high-resolution model for its region — AROME in France, ICON-D2 in the DACH countries, UKV in the UK, MET Nordic in Scandinavia, HRRR in the US — with a model-agreement confidence score, so you can see at a glance whether the models are telling the same story about your site or arguing.

Minute 13–15: the local reality check

No grid box, not even 1.3 km, contains your launch. Models miss the gully that funnels the breeze, the valley wind that switches at midday, the rotor behind the spine. That knowledge only lives locally, so the last minutes of the briefing happen outside the apps:

1. Check live wind stations and webcams near the site, not just the model output.
2. Ask the local club or school. One sentence from a local — "it switches south after one o'clock" — outweighs an hour of model reading. Federation weather pages, like the DHV's pilot weather service in Germany, add a flying-specific read of the day.
3. On launch, stand still and watch: the windsock for a few full minutes, the sky against what the forecast promised, the other wings already in the air.

Then the standing rule that ties the whole briefing together: if the sky or the windsock disagrees with the forecast, believe the sky. A forecast is a hypothesis; the site is the evidence. The same routine scales up when you are checking conditions before an Alps trip — run the briefing per site, not per region.

One last honest word. This method tells you when not to fly; it does not teach you to fly in what remains. Real weather judgment is learned at school, on the hill with certified instructors — FFVL in France, DHV in Germany, BHPA in the UK, USHPA in the US — who show you what each line of the forecast feels like in the air.

Until the numbers and the sky both say yes, the day is a no. When in doubt, don't launch — the sky will still be there tomorrow.