Wind Shear and Microbursts
Recognizing the invisible killer and surviving an encounter
No Aircraft Can Out-Perform a Severe Microburst
A microburst can produce downdrafts exceeding 6,000 fpm—more than any aircraft can outclimb. The only defense is avoidance. If you encounter a microburst at low altitude, survival depends on luck and immediate, aggressive recovery technique.
Understanding Wind Shear
Wind shear is any rapid change in wind velocity—speed, direction, or both—over a short distance. When you fly through wind shear, your aircraft's indicated airspeed changes suddenly because the air mass around you has different motion than the air you just left. This creates immediate changes in lift and can drive you toward the ground.
Wind shear is most dangerous near the ground where you have no altitude to recover. During approach, an aircraft configured for landing with gear and flaps down has limited energy available. A sudden loss of airspeed can push the aircraft below the approach path with insufficient power to recover before impact.
Anatomy of a Microburst
4,000-6,000+ fpm
increases lift
ZONE
decreases lift
The deadly sequence on approach:
- 1. Aircraft enters headwind outflow—airspeed increases, aircraft balloons above glidepath. Pilot reduces power to correct.
- 2. Aircraft enters downdraft core—rapid descent rate, altitude loss despite pitch-up.
- 3. Aircraft exits into tailwind outflow—airspeed drops 30-50 knots instantly, approaching stall with insufficient altitude to recover.
The pilot who reduced power in step 1 (a normal reaction) has made the situation worse. By the time they recognize the microburst in step 2-3, recovery may be impossible.
Recognition Cues
Visual Indicators
- • Localized dust/debris cloud on surface
- • Rain shaft curving outward near ground
- • Virga (precipitation not reaching ground)
- • Ring of dust spreading from a point
- • Trees/grass suddenly bending outward
- • Nearby thunderstorm or heavy rain
Flight Deck Indicators
- • Sudden airspeed increase then rapid decrease
- • Excessive sink rate despite pitch-up
- • Indicated airspeed/groundspeed divergence
- • GPWS/TAWS "WINDSHEAR" alert
- • Predictive windshear system warning
- • ATC reports from preceding aircraft
METAR Wind Shear Reports
KDFW 161853Z 18012G25KT 10SM FEW045CB SCT250 32/19 A2987 RMK AO2 WS020/18045KT
WS020/18045KT means wind shear at 2,000 feet AGL with wind from 180° at 45 knots. This indicates significantly different wind than the surface observation (180° at 12G25), warning of shear on approach/departure.
Wind Shear Recovery Procedure
Immediate Actions - MEMORIZE
-
1
THRUST/POWER - MAXIMUM
Firewall the throttle(s). Do not hesitate.
-
2
PITCH - 15° NOSE UP (initial)
Rotate to escape attitude. Adjust as needed to arrest descent.
-
3
SPEEDBRAKES/SPOILERS - RETRACT
Any drag reduction helps. Check these are stowed.
-
4
CONFIGURATION - DO NOT CHANGE
Leave gear and flaps as they are. Changing takes time and attention.
-
5
STICK SHAKER - FLY THROUGH IF NECESSARY
Accept stall warning to maintain escape pitch. Controlled flight into terrain is worse than a stall warning.
This recovery is aggressive for a reason. Studies show pilots who hesitate or make half-measures don't survive microbursts. The goal is to fly out of the shear as quickly as possible, trading airspeed for altitude if necessary.
Avoidance Strategies
If thunderstorms are within 15 nm of the airport, wait for them to pass.
Low Level Windshear Alert System provides surface-based detection at major airports.
Half the gust factor (e.g., if wind is 15G25, add 5 knots to approach speed).
ATC can tell you about ride quality on approach—ask specifically.
If anything seems wrong on approach, execute missed approach immediately.
Key Takeaways
- Wind shear kills because it's invisible and strikes at low altitude
- Microbursts produce unsurvivable downdrafts—avoidance is the only defense
- Recovery: MAX power, 15° pitch, retract spoilers, don't reconfigure, accept stick shaker
- Stay away from airports when thunderstorms are within 15 nm
Adds essential categorization of wind shear types that pilots need to understand for proper recognition
Types of Wind Shear
Horizontal Wind Shear
Changes in wind speed or direction along a horizontal plane. Common during frontal passage, around jet streams, and near thunderstorms. Creates sudden airspeed changes that affect lift and aircraft control.
- Frontal boundaries
- Temperature inversions
- Terrain effects
Vertical Wind Shear
Rapid changes in wind velocity with altitude. Most dangerous during takeoff and landing when altitude is limited. Microbursts produce the most severe vertical wind shear.
- Microbursts and downbursts
- Orographic lifting
- Thermal boundaries
Critical addition covering how pilots can actually recognize wind shear before and during encounters, addressing a major gap in the original content
Recognition Techniques and Warning Signs
Visual Clues
Look for virga (precipitation not reaching ground), dust clouds, and ring-shaped dust patterns beneath thunderstorms. These indicate potential microburst activity.
Instrument Indications
During wind shear encounter, watch for rapid, unexplained changes in airspeed indicator, sudden altitude deviations despite steady pitch attitude, and unusual power requirements to maintain desired flight path. Modern aircraft may have wind shear detection systems that provide aural and visual warnings.
Weather Conditions Favoring Wind Shear
- Thunderstorms within 5 miles of airport
- Temperature differences greater than 10°C across short distances
- Strong low-level jets (winds >50 knots below 2,000 feet)
- Frontal passages with significant pressure changes
- Temperature inversions with wind direction changes
Essential procedural information that pilots need for actual wind shear encounters, directly addressing the 'Recovery' portion of the article title
Wind Shear Recovery Procedures
Immediate Action Items
- Disconnect autopilot immediately - Manual control is essential
- Apply maximum available power - Don't worry about engine limitations
- Rotate toward initial target pitch attitude - Usually 15° nose up for transport aircraft
- Monitor airspeed trend, not absolute value - Focus on stopping airspeed decay
- Accept altitude loss - Trading altitude for airspeed may be necessary
Key Recovery Principles
The goal is to minimize altitude loss while maintaining flying airspeed. During performance-decreasing shear (typical on approach), aggressive power application combined with optimal pitch attitude maximizes your chances of flying through the shear layer.
"Pitch attitude, power, and patience"—the three P's of wind shear recovery. Maintain precise control inputs and resist the urge to over-control based on momentary instrument readings.