Skydiving Weather Guide

How Windy Is Too Windy to Skydive?

There's no single number for everyone. It depends on who's jumping and on the dropzone.

• Solo students: USPA's Basic Safety Requirements cap ground wind for solo students at 14 mph. Many schools set their student limits lower.
• Tandems: limits come from the tandem system manufacturer and the DZ's own rules.
• Licensed jumpers: USPA doesn't set a ground wind limit. Your DZ's rules and your own personal limits apply. Set those limits on a calm day, not while you're standing in the loading area.

Gusts matter as much as the average. 12 mph steady is a very different day from 8 gusting 20. A big gap between the steady wind and the gusts means bumpy, unpredictable air right where you're flaring.

Winds aloft matter too. Strong upper winds push you a long way in freefall, make the spot more critical, and mean groups need more time between exits on jump run. If you open in the wrong place on a big upper-wind day, you may not make it back.

Weather Decision Framework (Go or No-Go)

When the weather is borderline, break the decision into four questions:

• Trend: Is it getting better, staying the same, or getting worse before your load goes?
• Confidence: Do the METAR, TAF, models, and radar agree with each other, or are they telling different stories?
• Consequence: If you're wrong, is it a long walk back, or a hard landing that could get you hurt?
• Alternatives: Can you wait a load, do a simpler jump, use a bigger landing area, or sit this one out?

If you're newer to the sport, keep your personal limits conservative and don't be shy about asking an instructor or experienced jumper what they think before you get on the plane.

Wind Structure by Altitude

The wind on the ground, the wind where you fly your canopy, and the wind in freefall are often blowing different directions at different speeds. Each layer affects a different part of the jump.

• Surface layer: sets your landing direction, how bumpy final will be, and where turbulence forms behind hangars and trees.
• Canopy layer: decides how far you drift under canopy, how fast your downwind leg is, and where you need to set up your pattern.
• Upper layer: decides where the plane should drop you and how far you move in freefall.

When the wind direction changes a lot with altitude, you won't drift in a straight line. A spot that works for a belly group can be wrong for a freefly group or a tandem, because they spend different amounts of time in each layer and open at different altitudes.

Thermal Turbulence and Rotor

Thermal Turbulence

Thermals are rising bubbles/columns of warm air and are usually strongest during sun-driven heating cycles. They can produce abrupt vertical and lateral changes under canopy, especially over mixed terrain (asphalt, fields, buildings, and dry patches).

A canopy can feel floaty in the thermal core, then lose lift after crossing the edge into sinking air. That "pop up then sink" transition is one of the classic thermal-turbulence surprises on final.

Mechanical Turbulence and Rotor

Flow over and around terrain or obstacles can create wake turbulence and rotor on the lee side. This is common near hangars, tree lines, ridges, and large structures and can persist downwind.

What this means under canopy

• Expect the canopy to get knocked around more, and be ready to correct quickly.
• Give other canopies more room, keep your landing plan simple, and make your decisions before you get low.
• Hot summer afternoons are usually the bumpiest part of the day.

Gust Fronts, Outflow, and Storm Influence

Thunderstorms push out a wall of cold air called an outflow boundary or gust front. It can bring sudden wind shifts and strong gusts miles away from the rain.

• A storm in the distance can send dangerous wind to the DZ long before any rain arrives.
• When the gust front passes, the landing direction you planned can be wrong within a minute.
• If radar or warnings show storms heading your way, hold the loads until they pass.

Wind Shear and Directional Change

Wind shear is a significant change in wind speed and/or direction over a short distance. Under canopy, you feel it as a sudden change in groundspeed or a push off your heading, often during opening or low in the pattern.

• Compare the surface wind to the 3,000 ft wind. A big change in direction between them is a clue.
• A sudden speed change can make you overshoot or come up short on final, or turn faster than you expect.
• Ask the pilot and watch earlier loads. They'll often see shear before any forecast shows it.

Dust Devils and Dirt Devils

Dust devils are spinning columns of rising air that form over hot, dry ground, usually on sunny days with fairly light wind. Most are small and only last a minute or two, but they can still collapse a canopy close to the ground.

• Most common in the hottest part of the afternoon over dirt, dry grass, and pavement.
• Look for spinning dust, leaves or debris lifting off the ground, or windsocks pointing different ways.
• If you see one near the landing area, hold until they stop forming.

Collapses, Surges, and Deformation Risk

In turbulent air, a ram-air canopy can surge forward, rock, turn on its own, or partly collapse for a moment. Up high that's usually just uncomfortable. Close to the ground there's no time to recover.

• The air downwind of hangars, tree lines, and buildings is the usual place for collapses and surges.
• Big gusts make final approach unstable and make it hard to time your flare.
• Jumping earlier or later in the day avoids the worst of the afternoon thermals.

On bumpy days, keep your landing simple, fly a predictable pattern, and stay away from obstacles. If you haven't taken a canopy course, it's the single best thing you can do to handle these days well. They teach you what turbulence feels like and how to fly through it. Find one through USPA.

Weather Checks Before You Board

• Check how old the data is. A 3-hour-old observation isn't today's wind.
• Compare what's happening now (METAR, windsock) with what's forecast.
• Look at the wind and gusts again right before you board, not just at the morning briefing.
• Have a backup plan: wait a load, do a simpler jump, change your landing plan, or sit it out.
• If a storm, a new alert, or a pilot report changes the picture, talk it through again.

Students and newer jumpers: ask questions, and if the weather feels off, it's always OK to sit a load down.

Use With winDZaloft Tools

• Main weather dashboard for layer-by-layer winds and source comparison.
• Jump Run and Drift Calculator for drift and exit separation.
• Wing Loading Calculator to check your wing loading.

Trusted References

Sources used for this page, if you want to go deeper.