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

440 minutes (7h 20m)

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
8.2 /10
Smoothness
Smooth Flight
30%
Smooth
69%
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

6 hours 40 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 85 knots. These winds are favorable and may get you there up to 51 minutes early.

Landing

Landing should feel a bit bumpy on descent 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
69% of your flight
Peak Intensity
MODERATE
Brief sections only
Route Breakdown (112 zones)
Moderate
1 zones (1%)
Light
77 zones (69%)
Smooth
34 zones (30%)
Forecast Valid: Oct 13, 18:00 UTC (Generated: Oct 13, 18:00 UTC)
Flight Timeline 7h 20min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Light
1:30-2:00
Light
2:00-2:29
Smooth
2:29-2:58
Light
2:58-3:27
Light
3:27-3:56
Light
3:56-4:25
Light
4:25-4:54
Light
4:54-5:23
Light
5:23-5:52
Light
5:52-6:21
Light
6:21-6:50
Moderate
Landing
Light
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 forecast combines ECMWF and NOAA weather data, atmospheric conditions, and pilot reports to build a route-specific picture, updated every 6 hours. 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
50 kt
57 mph
Average Winds
85 kt
97 mph
Maximum Winds
112 kt
128 mph
Valid: Oct 13, 21:00 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 EXCELLENT
Wind Assessment: Strong tailwinds (66 kt avg) will significantly reduce flight time and improve fuel efficiency. Moderate crosswinds averaging 41 kt - normal for cruise altitude
Route Wind Breakdown
Tailwinds
70 zones (62%)
Crosswinds
41 zones (37%)
Strong tailwinds averaging 66 kt - faster flight, better fuel efficiency!
Flight Time Impact
66 kt
Avg Tailwind
-51 min
Time Impact
Faster than normal ✓
Wind Range:
• Max Tailwind: 108 kt
• Max Headwind: 0 kt
• Max Crosswind: 94 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)
7%
Smooth (<15%)
8 zones
6%
Light (15-30%)
7 zones
84%
Moderate (30-50%)
94 zones
3%
Severe (≥50% prob)
3 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 SIGMETs (Turbulence Warnings) 1 Warning
SIGMETs are official warnings about significant turbulence that may affect flight safety. Always consult official aviation weather briefings before flight.
SIGMET KKCI Severe Convective
Altitude Range: 0 - 40,000 ft (FL000 - FL400)
Valid: Oct 13, 19:55 UTC - 21:55 UTC
Movement: W (270°) at 40 kt (~46 mph)
Raw SIGMET: WSUS31 KKCI 131955 MKCE WST 131955 CONVECTIVE SIGMET 35E VALID UNTIL 2155Z MA NH VT NY FROM 50NNE MPV-50NNE BDL-20ENE HNK-40NW SYR-20W MSS-50NNE MPV AREA TS MOV FROM 27040KT. TOPS TO FL400.
Active Turbulence Warnings (AIRSIGMETs) Loading...
Pilot Reports (PIREPs) - 100 Reports
What are PIREPs? Pilot Reports (PIREPs) are real-time observations from pilots flying the route. They are direct, first-hand reports of actual conditions aloft.
Time (UTC) Intensity Altitude Aircraft Report
Airport Forecasts (TAF) - Next 24-30 Hours
Departure: KJFK
Valid: Oct 13 18:00 - Oct 15 00:00 UTC
18:00 - 23:00 UTC
Wind: 170° at 11 kt
Visibility: 6+ SM
Clouds: SCT 3000 ft, BKN 20000 ft
FM 23:00 - 10:00 UTC
Wind: 200° at 10 kt
Visibility: 6+ SM
Clouds: SCT 25000 ft
FM 10:00 - 15:00 UTC
Wind: 240° at 8 kt
Visibility: 6+ SM
Clouds: FEW 25000 ft
FM 15:00 - 22:00 UTC
Wind: 270° at 13 kt gusting to 19 kt
Visibility: 6+ SM
Clouds: SCT 3500 ft, SCT 12000 ft
FM 22:00 - 00:00 UTC
Wind: 310° at 12 kt
Visibility: 6+ SM
Clouds: SCT 3500 ft, BKN 12000 ft
Raw TAF: 
TAF KJFK 131720Z 1318/1424 17011KT P6SM SCT030 BKN200 FM132300 20010KT P6SM SCT250 FM141000 24008KT P6SM FEW250 FM141500 27013G19KT P6SM SCT035 SCT120 FM142200 31012KT P6SM SCT035 BKN120
Arrival: EGLL
Forecast Valid: Oct 13 18:00 - Oct 15 00:00 UTC
18:00 - 00:00 UTC
Wind: 260° at 9 kt
Visibility: 6+
Clouds: FEW at 4000 ft
PROB PROB 30% 04:00 - 08:00 UTC
Visibility: 3.73
Raw TAF: 
TAF EGLL 131652Z 1318/1424 26009KT 9999 FEW040 PROB30 1404/1408 6000
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: 19°C (66°F) | Dewpoint: 17°C
Wind: 170° at 13 kt gusting to 19 kt
Sky: FEW1600 FEW3000 SCT22000 (Base: 1600 ft)
Flight Category: VFR
Altimeter: 1012.60 inHg (1012 mb)
Observed: Oct 13 20:51 UTC
Raw METAR: 
METAR KJFK 132051Z 17013G19KT 10SM FEW016 FEW030 SCT220 19/17 A2990 RMK AO2 SLP125 T01940167 56022
Arrival: EGLL
Temperature: 14°C (57°F) | Dewpoint: 10°C
Wind: 270° at 10 kt
Sky: CLR
Flight Category: VFR
Altimeter: 1026.00 inHg
Observed: Oct 13 20:50 UTC
Raw METAR: 
METAR EGLL 132050Z AUTO 27010KT 9999 NCD 14/10 Q1026
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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