Thermalling is the skill that separates pilots who fly for hours from pilots who sled. Here is how to find thermals, enter them, center them, and climb efficiently - with the techniques that actually work.
Thermalling Is the Whole Sport
If you cannot thermal, paragliding is a 15-minute sled ride from launch to LZ. If you can thermal, the same launch becomes a 3-hour cross-country flight. The skill of finding and using thermals is what separates pilots who go places from pilots who do not.
This guide covers the full thermalling stack: what thermals are, how to find them, how to enter them, how to center the core, how to climb efficiently, and how to actually develop the skill. The tactics here come from 25+ years of teaching pilots in the most consistent thermal conditions in the Americas.
What a Thermal Actually Is
A thermal is a column or bubble of warm air rising through cooler surrounding air. The sun heats the ground unevenly - dark surfaces, exposed rock, plowed fields, parking lots, and south-facing slopes heat faster than grass, water, or shaded terrain. The air directly above the warmer surface heats by conduction, becomes less dense than the surrounding air, and rises.
Thermals can be:
- Bubbles: Discrete pockets of rising air, common in early morning or in light conditions.
- Columns: Continuous chimneys of rising air with a steady source on the ground.
- Streets: Lines of thermals organized by wind, often marked by rows of cumulus clouds.
From the pilot's perspective, the difference between bubbles and columns matters. Bubbles you ride up briefly and lose; columns you can stay in for thousands of feet.
Visual Cues for Finding Thermals
Thermals are invisible, but their effects are not. Experienced pilots find thermals by reading multiple cues simultaneously:
Cumulus clouds
Cumulus (puffy white clouds with flat bottoms) form where thermals rise to dewpoint. The cloud sits roughly above the thermal's source on the ground. A growing cumulus is being fed; a dying one is shutting off.
Read clouds by:
- Cloud age: Sharp, white edges = active. Soft, fuzzy edges = dying.
- Cloud base height: Higher cloudbase = stronger thermals.
- Cloud distribution: Cumulus in lines indicates organized convection (street day).
Ground features
Even on blue-sky days (no cumulus), the ground tells you where thermals trigger:
- Rock outcrops: Heat fast, generate strong thermals.
- Plowed fields: Dark soil heats well, produces consistent thermals.
- Parking lots and roads: Asphalt is among the strongest thermal generators.
- South-facing slopes (Northern Hemisphere): Direct sun exposure all day.
- Wind convergence zones: Where two air masses meet, lift forms.
- Lakeshores and water boundaries: Differential heating between water and land creates predictable lift patterns.
Birds and other pilots
Soaring birds - hawks, eagles, vultures - are far better at finding thermals than humans. Watch them. If a bird is circling, there is lift.
Other paragliders are equally informative. A pilot who is climbing has found a thermal. Fly to that lift and join the gaggle (with proper etiquette - more on that below).
Wing feedback
The wing tells you about lift before you consciously notice it:
- Brake pressure increases: Wing flying through rising air loads up.
- Wing pitches back: The wing slows briefly as it enters lift.
- Wing rolls toward lift: Asymmetric lift tilts the wing toward the side of stronger rising air.
- Vario beeps: The audible feedback of climb rate. This is your most direct cue once you are inside lift.
Entering a Thermal
The transition from gliding to thermalling is where most pilots lose the lift. The wing hits the thermal, the pilot reacts late or wrong, and the wing flies back out.
The entry sequence
- Feel the lift. Wing surges, brakes load up, vario beeps.
- Identify which side has stronger lift. Did the wing roll left or right? That tells you which way to turn.
- Bank into the lift immediately. Use weight shift plus brake on the lift side. A 30 to 45-degree bank is appropriate for most thermals.
- Tighten as needed. If the climb rate stays strong as you turn, the bank is right. If you fly out of lift, tighten the turn.
- Settle in. Once you are climbing consistently, hold your bank, watch the vario, and adjust as the lift changes.
Common entry mistakes
- Turning too late: The wing has already flown out the back of the thermal before the pilot reacts.
- Turning the wrong way: Misreading which side had stronger lift, banking away from the core.
- Bank too shallow: The turn radius is bigger than the thermal, so you keep flying out.
- Bank too steep: Lose altitude in tight turns when the thermal is actually wide and flat.
- Hesitation: The pilot questions whether it is "really" a thermal. By the time they decide, the wing is back in sink.
Centering the Core
You are now in a thermal turning in circles. The next skill is staying in the strongest lift - the "core" - rather than orbiting around the edges.
Reading climb rate through the circle
As you turn, your vario reads different climb rates at different points in the circle. The point where lift is strongest is where the core sits relative to your turn.
- Strong lift at the back of your turn (you just passed through it): The core is behind you. Tighten your turn or reverse the turn for a moment to bring you back into it.
- Strong lift at the front of your turn (you are flying into it): The core is ahead. Open your bank slightly to extend toward it.
- Strong lift on the inside of your turn: Your circle is too wide. Tighten the bank.
- Strong lift on the outside of your turn: Your circle is too tight or you are wrong-side. Open the bank or reverse direction.
The "shift the circle" technique
Once you identify where the core is relative to your turn, you do not stop turning - you shift the entire circle toward the lift.
If the strongest lift is at the back of your turn (3 o'clock position if you are turning right), you shift the circle by:
- Continuing your turn at current bank for one revolution.
- Identifying where the strongest lift is now.
- If still off-center, opening the bank briefly when you are flying away from the core (extends you in that direction), then tightening when flying back through the core.
- Repeating until the lift is consistent through the entire circle.
This sounds complicated reading it. In practice, with radio coaching, it takes a few thermals to start clicking. Without coaching, it takes hundreds of thermals.
Bank Angle and Thermal Size
Different thermals require different bank angles:
- Small, strong thermals (under 100 meters diameter): 45 to 60 degree bank. Tight turns to stay in the small core.
- Medium thermals (100 to 200 meters): 30 to 45 degree bank.
- Large thermals (over 200 meters): 20 to 35 degree bank. Wider turns.
- Weak, broken lift: 15 to 25 degree bank, often called "figure-8 thermalling" - working back and forth through patchy lift.
The principle is to match your turn radius to the thermal's diameter. Too tight in a wide thermal wastes altitude. Too flat in a small thermal flies you out.
Reading Lift Through the Climb
A thermal is not uniform from base to top. Climb rate varies as you ascend. Strong pilots read these changes and adjust:
- Strengthening climb: The thermal is well-organized and feeding strongly. Stay in it.
- Weakening climb: You are reaching the top, the thermal is dying, or you are drifting out of the core. Investigate, adjust, or leave.
- Pulsing lift: Strong, weak, strong, weak. Often indicates a wind-deformed thermal or convergence. Adjust circle position.
- Sudden zero: You have flown out of the lift. Open the turn briefly, find the lift again, re-center.
Drift and Wind
Thermals drift downwind as they rise. A thermal that triggered 1km upwind is overhead now and will be 1km downwind in a few minutes. The trigger on the ground is often the most important reference for finding the next thermal - the air above is constantly moving.
In strong wind, you may need to crab into the wind while thermalling to stay over the trigger. In light wind, drift is minimal and you can climb in a steady column.
Reading drift is one of the most useful XC skills. Once you can predict where the next thermal will be based on the trigger you just used, your cross-country range expands dramatically. This is exactly what we teach in our XC clinic.
Thermalling With Other Pilots
Multi-pilot thermals (gaggles) are common at popular sites. Etiquette and right-of-way rules:
- The first pilot in the thermal sets the turn direction. Everyone else turns the same way.
- Right of way is by altitude: Lower pilot has right of way.
- Maintain visual on every pilot you are sharing the thermal with. Do not lose track of anyone above or below you.
- Adjust your turn to maintain spacing: Open the bank slightly to give space to a pilot below; tighten if a pilot above is converging.
- Leave the thermal cleanly: Roll out of your turn predictably, do not cut across other pilots.
Bad gaggle behavior is how mid-air collisions happen. Most pilots who fly busy sites learn this etiquette quickly because the consequences are immediate.
When to Leave a Thermal
Climbing is good. Climbing forever is not the goal. Knowing when to leave is its own skill:
- Cloudbase reached: You cannot legally climb into the cloud. Time to leave for the next one.
- Climb rate has dropped significantly: A thermal that was 4 m/s and is now 1 m/s might be dying. Check whether to push through to top or leave for fresher lift.
- You see a stronger thermal nearby: Pilots climbing faster nearby probably found a better core. Consider transitioning.
- You have enough altitude for your goal: If you are XC-ing to a destination, you might not need to top out. Leave when you have enough.
- The gaggle is too crowded: Sometimes a thermal becomes more dangerous than productive.
How to Actually Develop Thermalling Skill
You cannot learn thermalling from articles. You learn it through:
- Time in thermals. The single biggest variable. Pilots who spend 50 hours in thermals thermal better than pilots who spend 5.
- Coaching. Someone who can see what your wing is doing and tell you what to fix in real time. Radio-guided instruction compresses years of trial-and-error into weeks.
- Vario logging and review. Looking at your tracks after a flight shows you patterns you cannot feel in the air. Where did you fly through cores? Where did you fall out? Where did you climb fastest?
- Consistency. Flying the same site over multiple days lets you build pattern recognition - "this is where the morning thermals always trigger" - that takes years to develop at a site you fly twice a year.
The Best Way to Learn Thermalling Fast
Most US pilots learn thermalling slowly because they fly inconsistent home sites in unpredictable conditions, with no coaching, and few flights per week. Five years to develop solid thermalling is normal under those constraints.
The fastest way to learn thermalling is to combine three things: a site with consistent thermal cycles, daily flying for a week or more, and radio coaching from an instructor who can see your wing and call your turns.
This is exactly what our thermalling clinic in Valle de Bravo is built around. The Hair Dryer thermal cycle fires at 10 AM almost every day. The thermals are moderate-strength, well-organized, and forgiving. Damien is on the radio coaching every climb. By the end of a 5-day clinic, most pilots leave climbing more consistently than they did after years at home.
Read more about why Valle de Bravo is the best place in the Americas to learn thermalling, or see what to expect as a P2 pilot in our guide for P2 pilots flying Valle de Bravo.
Common Thermalling Questions Pilots Ask Damien
"Why can't I find thermals at my home site?" Most home sites have weak or scattered thermals. Travel to a strong site for two weeks. Your thermal-finding instinct calibrates to whatever conditions you fly most. Strong consistent thermals teach you what to feel for; weak scattered thermals do not.
"Should I get a better vario?" Probably not. A $200 vario beeps when you go up. Fancy varios add features that matter at the P3+ level (airspace, route planning, wind direction) but do not improve your thermalling skill. Spend the money on a clinic instead.
"How do I know which way to turn when I hit lift?" Watch the wing tips. If the right tip rises and the left drops, lift is on the right side. If both rise evenly, you are entering centered - turn either way. Weight-shift plus brake commits the turn fast.
"Should I follow other pilots into thermals?" Yes, especially when you are learning. A pilot climbing consistently has found lift. Join from below or beside, follow the gaggle direction, and use them as a reference for where the core is.
Ready to Develop Real Thermalling Skill?
If you are stuck thermalling at your home site, the answer is almost never "more time at home." The answer is to find a site with the right conditions and the right instruction, and put in concentrated time.
Our thermalling clinic in Valle de Bravo is built specifically for pilots who want to break through this skill. Five days of multi-flight days, daily ground school, evening flight reviews, and radio-guided coaching in the most consistent thermal conditions in the Americas.
Have questions about your thermalling progression, whether you are ready for a clinic, or how to plan your trip? Reach out to Damien for honest guidance based on 25+ years of teaching thermalling to pilots at every level.