KJFK EGLL

John F Kennedy International Airport London Heathrow Airport
Route Information
Departure

KJFK (JFK)

Distance

5,539.7 km (2,991.2 nautical miles)

Arrival

EGLL (LHR)

Flight Time

415 minutes (6h 55m)

Flight Profile

Cruise Altitude: 39,000 ft (Flight Level 390)

Route calculated using great circle navigation

Turbulence Comfort Along Route Comfort View
Comfort Score: Combines turbulence probability (GTG forecast) with intensity (ZTI analysis). High scores indicate both high probability AND high intensity turbulence.
Smooth
Comfortable
Noticeable
Uncomfortable
Formula: (Probability × Intensity)
Flight Smoothness Score
8.7 /10
Smoothness
Smooth Flight
48%
Smooth
51%
Light
1%
Moderate
AI-Powered Flight Briefing
📊 11,000 data points analyzed
Advanced AI-Powered Flight Briefing
Your Flight

We analysed more than 11,000 data points along your route from John F Kennedy International Airport, New York to London Heathrow Airport, London.

Your Journey Beta

4 hours 35 minutes into the flight: Some moderate bumps expected.
The crew may adjust altitude or ask you to stay seated during these sections.
The rest of the flight should be smooth.

Your route takes you over the Appalachian Mountains and crossing the North Atlantic Ocean – these areas can sometimes cause light turbulence.

Smooth Flight

We're expecting smooth conditions throughout your flight. You can sit back and relax.

Takeoff

Takeoff should feel smooth with possible light bumps, with calm conditions around the airport.

Winds Aloft

Winds at cruising altitude are about 47 knots. These winds are favorable and may get you there up to 13 minutes early.

Landing

Landing should feel smooth with typical approach conditions.

You're in Safe Hands

If you feel nervous at any point, remember that turbulence is expected, safe, and part of normal flying. The crew is monitoring everything, and the aircraft is built to handle far more than anything you will feel. Have a safe and calm flight.

Relaxation Exercises
Live data from ECMWF global forecast models • 12 atmospheric pressure levels analyzed • Updated every 6 hours
Most Common
LIGHT
51% of your flight
Peak Intensity
MODERATE
Brief sections only
Route Breakdown (112 zones)
Moderate
1 zones (1%)
Light
57 zones (51%)
Smooth
54 zones (48%)
Forecast Valid: Jul 18, 06:00 UTC (Generated: Jul 18, 06:00 UTC)
Flight Timeline 6h 55min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Light
1:30-2:00
Light
2:00-2:30
Smooth
2:30-3:00
Light
3:00-3:30
Light
3:30-4:00
Light
4:00-4:29
Light
4:29-4:58
Moderate
4:58-5:27
Smooth
5:27-5:56
Light
5:56-6:25
Smooth
Landing
Smooth
Smooth
Light
Moderate
Severe
Longer bars indicate higher turbulence intensity. Values shown are the maximum for each time segment.
Turbulence Metrics ZTI and EDR
Comparing Two Turbulence Metrics:
  • ZTI (ZeroTurb Index): Our proprietary composite metric (0.0-1.0 scale)
  • EDR (Eddy Dissipation Rate): ICAO/WMO official standard (m^(2/3)/s scale)
ZTI Scale (Custom)
Smooth
<0.2
Light
0.2-0.5
Moderate
0.5-0.75
Severe
>0.75
EDR Scale (ICAO)
Smooth
<0.1
Light
0.1-0.4
Moderate
0.4-0.7
Severe
>0.7

Detailed Analysis Below: While flights generally follow these patterns, our advanced turbulence prediction system analyzes real-time weather data, atmospheric conditions, and pilot reports to provide you with precise, route-specific forecasts. Review the detailed metrics and interactive maps below for a comprehensive understanding of expected conditions along your flight path.

How Aircraft Size Affects Your Comfort

Did you know that the size of your aircraft can affect how turbulence feels? Larger, wide-body aircraft have more mass and inertia, which means they absorb turbulent air movements more smoothly. Smaller regional jets and turboprops are lighter, so passengers may feel more noticeable movement during the same turbulence conditions.

Important: All commercial aircraft, regardless of size, are designed and certified to safely handle even severe turbulence. The difference is only in passenger comfort - not safety.

Learn more about how aircraft size affects your turbulence experience
Technical Forecast Details Advanced Analysis

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Comprehensive Flight Profile Altitude • Wind • Turbulence

Flight Altitude Profile
  • X-axis: Distance along route (km)
  • Y-axis (left): Aircraft altitude (feet)
  • Blue = Climb phase
  • Green = Cruise phase
  • Orange = Descent phase
Pilot Reports (PIREPs)

Real turbulence reports from pilots who recently flew near your route:

  • Green = Smooth (no turbulence)
  • Yellow = Light turbulence
  • Orange = Moderate turbulence
  • Red = Severe turbulence
Wind Speed
  • Y-axis (right): Wind speed in knots
  • Sudden wind changes often indicate turbulence
  • Hover over points to see wind direction
AI Comfort Forecast
  • Y-axis (right): Comfort Score (0-70)
  • <1 = Smooth (cyan)
  • 1-25 = Light (green)
  • 25-50 = Moderate (orange)
  • >50 = Severe (red)
Tip: Look for areas where multiple indicators coincide (e.g., pilot reports + AI forecast + wind changes) to identify the most likely turbulence zones.
Aurora Status: Aurora forecast unavailable (Kp Index: 0)
Global Winds Forecast ECMWF Open Data Worldwide Coverage
Route-Specific Forecast: Wind data calculated at 112 waypoints along your flight path using high-resolution ECMWF global weather model (0.25° grid, ~25km resolution).
Minimum Winds
5 kt
5 mph
Average Winds
47 kt
55 mph
Maximum Winds
100 kt
115 mph
Valid: Jul 18, 09:00 UTC
Source: European Centre for Medium-Range Weather Forecasts
Flight Planning: Headwinds increase flight time and fuel consumption. Tailwinds decrease both. Strong crosswinds may affect takeoff/landing at airports.
Wind Impact Analysis GOOD
Wind Assessment: Favorable tailwinds (15 kt avg) provide good conditions for this flight. Light crosswinds averaging 39 kt - minimal impact
Route Wind Breakdown
Tailwinds
25 zones (22%)
Crosswinds
86 zones (77%)
Minimal headwinds/tailwinds - typical flight time expected
Flight Time Impact
15 kt
Avg Tailwind
-13 min
Time Impact
Faster than normal ✓
Wind Range:
• Max Tailwind: 52 kt
• Max Headwind: 38 kt
• Max Crosswind: 91 kt
Wind Speed Along Route ECMWF Forecast
ZeroTurb Index (ZTI) Analysis Custom Algorithm
What is ZTI? Our proprietary ZeroTurb Index combines three meteorological indicators to give you a comprehensive turbulence probability (0.0-1.0 scale). The chart below shows how each component contributes to the overall ZTI along your route:
  • Richardson Number (Ri): Atmospheric stability - lower values indicate CAT risk
  • Wind Shear Index (WSI): Rate of wind speed/direction changes
  • Temperature Gradient Index (TGI): Frontal boundary strength
  • ZTI (Composite): Proprietary composite of the three indices above
ZTI Thresholds: Smooth: 0.0-0.2 Light: 0.2-0.5 Moderate: 0.5-0.75 Severe: 0.75-1.0
Scientific GTG Analysis NOAA Standards
For Aviation Professionals: This section shows turbulence zones using conservative NOAA GTG thresholds. These scientific thresholds are more cautious than the user-friendly "Comfort View" above, which better represents typical passenger experience.

Note: Modern aircraft are designed to handle moderate turbulence effortlessly. What scientific models classify as "moderate" often goes unnoticed by passengers due to advanced flight control systems and aircraft structural design. Most commercial flights encounter some level of atmospheric turbulence that the aircraft manages automatically.
Zone Distribution (Scientific Thresholds)
28%
Smooth (<15%)
31 zones
19%
Light (15-30%)
21 zones
53%
Moderate (30-50%)
59 zones
1%
Severe (≥50% prob)
1 zones
Threshold Comparison
Category Comfort View Scientific (NOAA)
Smooth <20% probability <15% probability
Light 20-50% 15-30%
Moderate 50-75% 30-50%
Severe ≥75% ≥50%
Turbulence Probability Along Route GTG Forecast
Low (0-30%)
Light or no turbulence
Medium (30-50%)
Moderate turbulence likely
High (50-70%)
Moderate-severe expected
Extreme (70-100%)
Severe turbulence
Active Turbulence Warnings (AIRSIGMETs) Loading...
Pilot Reports (PIREPs) - 101 Reports
What are PIREPs? Pilot Reports (PIREPs) are real-time observations from pilots flying the route. They provide the most accurate turbulence information available.
Time (UTC) Intensity Altitude Aircraft Report
Airport Forecasts (TAF) - Next 24-30 Hours
Departure: KJFK
Valid: Jul 18 06:00 - Jul 19 12:00 UTC
06:00 - 13:00 UTC
Wind: 170° at 4 kt
Visibility: 6 SM
Weather: FU
Clouds: BKN 25000 ft
06:00 - 13:00 UTC
Wind: 170° at 4 kt
Visibility: 6 SM
Weather: FU
Clouds: BKN 25000 ft
FM 13:00 - 15:00 UTC
Wind: 200° at 10 kt
Visibility: 6 SM
Weather: FU
Clouds: OVC 15000 ft
FM 13:00 - 15:00 UTC
Wind: 200° at 10 kt
Visibility: 6 SM
Weather: FU
Clouds: OVC 15000 ft
FM 15:00 - 18:00 UTC
Wind: 190° at 12 kt
Visibility: 6 SM
Weather: FU VCSH
Clouds: SCT 1500 ft, OVC 7000 ft
TEMPO 15:00 - 18:00 UTC
Visibility: 3 SM
Weather: SHRA
Clouds: BKN 1500 ft, OVC 7000 ft
FM 15:00 - 18:00 UTC
Wind: 190° at 12 kt
Visibility: 6 SM
Weather: FU VCSH
Clouds: SCT 1500 ft, OVC 7000 ft
TEMPO 15:00 - 18:00 UTC
Visibility: 3 SM
Weather: SHRA
Clouds: BKN 1500 ft, OVC 7000 ft
FM 18:00 - 23:00 UTC
Wind: 190° at 14 kt
Visibility: 6+ SM
Weather: VCSH
Clouds: SCT 1500 ft, OVC 7000 ft
FM 18:00 - 23:00 UTC
Wind: 190° at 14 kt
Visibility: 6+ SM
Weather: VCSH
Clouds: SCT 1500 ft, OVC 7000 ft
TEMPO 19:00 - 23:00 UTC
Visibility: 2 SM
Weather: TSRA BR
Clouds: BKN 1500 ft, OVC 5000 ft (CB)
TEMPO 19:00 - 23:00 UTC
Visibility: 2 SM
Weather: TSRA BR
Clouds: BKN 1500 ft, OVC 5000 ft (CB)
FM 23:00 - 03:00 UTC
Wind: 200° at 14 kt gusting to 22 kt
Visibility: 5 SM
Weather: -SHRA
Clouds: BKN 1500 ft, OVC 5000 ft
TEMPO 23:00 - 03:00 UTC
Visibility: 2 SM
Weather: TSRA BR
Clouds: BKN 900 ft, OVC 5000 ft (CB)
FM 23:00 - 03:00 UTC
Wind: 200° at 14 kt gusting to 22 kt
Visibility: 5 SM
Weather: -SHRA
Clouds: BKN 1500 ft, OVC 5000 ft
TEMPO 23:00 - 03:00 UTC
Visibility: 2 SM
Weather: TSRA BR
Clouds: BKN 900 ft, OVC 5000 ft (CB)
FM 03:00 - 07:00 UTC
Wind: 240° at 12 kt
Visibility: 4 SM
Weather: SHRA
Clouds: BKN 2500 ft, OVC 5000 ft
FM 03:00 - 07:00 UTC
Wind: 240° at 12 kt
Visibility: 4 SM
Weather: SHRA
Clouds: BKN 2500 ft, OVC 5000 ft
FM 07:00 - 12:00 UTC
Wind: 280° at 12 kt
Visibility: 6+ SM
Clouds: SCT 4000 ft, BKN 10000 ft
FM 07:00 - 12:00 UTC
Wind: 280° at 12 kt
Visibility: 6+ SM
Clouds: SCT 4000 ft, BKN 10000 ft
Raw TAF: 
TAF KJFK 180530Z 1806/1912 17004KT 6SM FU BKN250 FM181300 20010KT 6SM FU OVC150 FM181500 19012KT 6SM FU VCSH SCT015 OVC070 TEMPO 1815/1818 3SM SHRA BKN015 OVC070 FM181800 19014KT P6SM VCSH SCT015 OVC070 TEMPO 1819/1823 2SM TSRA BR BKN015 OVC050CB FM182300 20014G22KT 5SM -SHRA BKN015 OVC050 TEMPO 1823/1903 2SM TSRA BR BKN009 OVC050CB FM190300 24012KT 4SM SHRA BKN025 OVC050 FM190700 28012KT P6SM SCT040 BKN100
Arrival: EGLL
Forecast Valid: Jul 18 06:00 - Jul 19 12:00 UTC
06:00 - 12:00 UTC
Wind: 40° at 10 kt
Visibility: 6+
Clouds: FEW at 3000 ft
06:00 - 12:00 UTC
Wind: 40° at 10 kt
Visibility: 6+
Clouds: FEW at 3000 ft
TEMPO PROB 40% 00:00 - 08:00 UTC
Wind: 340° at 6 kt
TEMPO PROB 40% 00:00 - 08:00 UTC
Wind: 340° at 6 kt
Raw TAF: 
TAF EGLL 180500Z 1806/1912 04010KT 9999 FEW030 PROB40 TEMPO 1900/1908 34006KT
About TAF: Terminal Area Forecasts (TAF) provide detailed 24-30 hour weather forecasts for airports, including wind, visibility, cloud ceiling, and weather phenomena. Updated every 6 hours by NOAA Aviation Weather Center.
Current Airport Weather (METAR)
Departure: KJFK
Temperature: 22°C (71°F) | Dewpoint: 20°C
Wind: 190° at 7 kt
Visibility: 4 SM
Sky: BKN25000 OVC30000 (Base: 25000 ft)
Flight Category: MVFR
Altimeter: 1016.00 inHg (1016 mb)
Observed: Jul 18 07:51 UTC
Raw METAR: 
METAR KJFK 180751Z 19007KT 4SM FU BKN250 OVC300 22/20 A3000 RMK AO2 SLP159 FU OVC300 T02170200 $
Arrival: EGLL
Temperature: 17°C (62°F) | Dewpoint: 11°C
Wind: 10° at 6 kt
Sky: SCT2100 (Base: 2100 ft)
Flight Category: VFR
Altimeter: 1020.00 inHg
Observed: Jul 18 07:50 UTC
Raw METAR: 
METAR EGLL 180750Z AUTO 01006KT 310V050 9999 SCT021 17/11 Q1020
About METAR: Meteorological Aerodrome Reports (METAR) provide current weather observations from airports, including temperature, wind, visibility, clouds, and atmospheric pressure. Updated hourly by NOAA Aviation Weather Center. Flight Categories: VFR (Good), MVFR (Marginal), IFR (Instrument Flight Rules), LIFR (Low Instrument Flight Rules).
Route Segment Analysis

The route has been divided into segments of approximately 500km each for detailed analysis.

Route Map With GTG Forecast Overlay
Data Sources & Our Approach
ZeroTurb's Custom Algorithm: Unlike generic turbulence forecasts, we've developed a proprietary ZeroTurb Index (ZTI) algorithm that combines three meteorological indices weighted by their predictive accuracy. This gives you transparent, passenger-focused turbulence probability (0.0-1.0 scale) instead of vague categories. Our approach processes raw ECMWF atmospheric data through custom calculations to detect Clear-Air Turbulence (CAT), wind shear zones, and frontal boundaries that cause bumpy rides.

This forecast integrates data from:

Disclaimer: This forecast is for informational purposes only. Always consult official aviation weather sources and follow ATC guidance.

How accurate are turbulence alerts? Alerts are based on updated forecast models and pilot reports, and can change as departure approaches.

Flight Insights & Recommendations

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