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
8.3 /10
Smoothness
Smooth Flight
35%
Smooth
64%
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

2 hours 20 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 58 knots. These winds are favorable and may get you there up to 40 minutes early.

Landing

Landing should feel smooth with possible light bumps 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
64% of your flight
Peak Intensity
MODERATE
Brief sections only
Route Breakdown (112 zones)
Moderate
1 zones (1%)
Light
72 zones (64%)
Smooth
39 zones (35%)
Forecast Valid: Apr 17, 18:00 UTC (Generated: Apr 17, 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
Moderate
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
Smooth
5:52-6:21
Light
6:21-6:50
Light
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 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
25 kt
28 mph
Average Winds
58 kt
67 mph
Maximum Winds
100 kt
115 mph
Valid: Apr 18, 00:00 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 (50 kt avg) will significantly reduce flight time and improve fuel efficiency. Light crosswinds averaging 26 kt - minimal impact
Route Wind Breakdown
Tailwinds
89 zones (79%)
Crosswinds
22 zones (20%)
Moderate tailwinds averaging 50 kt - good conditions for this route
Flight Time Impact
50 kt
Avg Tailwind
-40 min
Time Impact
Faster than normal ✓
Wind Range:
• Max Tailwind: 86 kt
• Max Headwind: 0 kt
• Max Crosswind: 58 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)
10%
Smooth (<15%)
11 zones
7%
Light (15-30%)
8 zones
83%
Moderate (30-50%)
93 zones
0%
Severe (≥50% prob)
0 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...
Lightning Activity (Last Hour) Low Activity

6

Total Strikes

15 min ago

Latest Strike

Decreased

Activity Level

1 hour

Time Window
Lightning strikes near your route indicate convective activity (thunderstorms). Areas with lightning typically have severe turbulence, icing, hail, and strong winds. Avoid these areas by at least 20 nautical miles.
Pilot Reports (PIREPs) - 70 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: Apr 17 20:00 - Apr 19 00:00 UTC
20:00 - 21:00 UTC
Wind: 230° at 8 kt
Visibility: 6+ SM
Weather: VCSH
Clouds: BKN 6000 ft
PROB PROB 30% 20:00 - 21:00 UTC
Wind: 350° at 11 kt gusting to 25 kt
Visibility: 3 SM
Weather: TSRA BR
Clouds: BKN 3500 ft (CB)
FM 21:00 - 01:00 UTC
Wind: 350° at 8 kt
Visibility: 6+ SM
Clouds: BKN 6000 ft
PROB PROB 30% 21:00 - 22:00 UTC
Visibility: 6 SM
Weather: -SHRA
FM 01:00 - 15:00 UTC
Wind: 80° at 7 kt
Visibility: 6+ SM
Clouds: SCT 1500 ft, SCT 7000 ft
TEMPO 02:00 - 06:00 UTC
Clouds: BKN 1500 ft
FM 15:00 - 18:00 UTC
Wind: 120° at 6 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, SCT 5000 ft
FM 18:00 - 00:00 UTC
Wind: 140° at 10 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, SCT 5000 ft
Raw TAF: 
TAF KJFK 171956Z 1720/1824 23008KT P6SM VCSH BKN060 PROB30 1720/1721 35011G25KT 3SM TSRA BR BKN035CB FM172100 35008KT P6SM BKN060 PROB30 1721/1722 6SM -SHRA FM180100 08007KT P6SM SCT015 SCT070 TEMPO 1802/1806 BKN015 FM181500 12006KT P6SM SCT025 SCT050 FM181800 14010KT P6SM SCT025 SCT050
Arrival: EGLL
Forecast Valid: Apr 17 18:00 - Apr 19 00:00 UTC
18:00 - 00:00 UTC
Wind: 230° at 12 kt
Visibility: 6+
Clouds: SCT at 3500 ft
TEMPO 18:00 - 02:00 UTC
Visibility: 4.35
Weather: RA SHRA
Clouds: BKN at 1400 ft
TEMPO PROB 30% 18:00 - 02:00 UTC
Clouds: BKN at 900 ft
18:00 - 00:00 UTC
Wind: 230° at 12 kt
Visibility: 6+
Clouds: SCT at 3500 ft
TEMPO 18:00 - 02:00 UTC
Visibility: 4.35
Weather: RA SHRA
Clouds: BKN at 1400 ft
TEMPO PROB 30% 18:00 - 02:00 UTC
Clouds: BKN at 900 ft
PROB PROB 30% 02:00 - 07:00 UTC
Visibility: 4.97
PROB PROB 30% 02:00 - 07:00 UTC
Visibility: 4.97
TEMPO PROB 30% 16:00 - 20:00 UTC
Visibility: 3.73
Weather: SHRA
TEMPO PROB 30% 16:00 - 20:00 UTC
Visibility: 3.73
Weather: SHRA
Raw TAF: 
TAF EGLL 171655Z 1718/1824 23012KT 9999 SCT035 TEMPO 1718/1802 7000 RA SHRA BKN014 PROB30 TEMPO 1718/1802 BKN009 PROB30 1802/1807 8000 PROB30 TEMPO 1816/1820 6000 SHRA
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: 24°C (75°F) | Dewpoint: 13°C
Wind: 330° at 11 kt
Sky: FEW4000 BKN15000 BKN25000 (Base: 4000 ft)
Flight Category: VFR
Altimeter: 1011.90 inHg (1012 mb)
Observed: Apr 17 21:51 UTC
Raw METAR: 
METAR KJFK 172151Z 33011KT 10SM FEW040 BKN150 BKN250 24/13 A2988 RMK AO2 WSHFT 2118 SLP117 VCSH N-NE T02390128
Arrival: EGLL
Temperature: 13°C (55°F) | Dewpoint: 9°C
Wind: 240° at 8 kt
Sky: BKN1500 BKN3800 (Base: 1500 ft)
Flight Category: MVFR
Altimeter: 1020.00 inHg
Observed: Apr 17 22:20 UTC
Raw METAR: 
METAR EGLL 172220Z AUTO 24008KT 9999 BKN015 BKN038 13/09 Q1020 TEMPO BKN014
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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