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
8.3 /10
Smoothness
Smooth Flight
33%
Smooth
66%
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

1 hour 15 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 60 knots. These winds are favorable and may get you there up to 42 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
66% of your flight
Peak Intensity
MODERATE
Brief sections only
Route Breakdown (112 zones)
Moderate
1 zones (1%)
Light
74 zones (66%)
Smooth
37 zones (33%)
Forecast Valid: Aug 31, 12:00 UTC (Generated: Aug 31, 12:00 UTC)
Flight Timeline 6h 55min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Moderate
1:30-2:00
Light
2:00-2:30
Light
2:30-3:00
Light
3:00-3:30
Light
3:30-4:00
Light
4:00-4:29
Light
4:29-4:58
Light
4:58-5:27
Light
5:27-5:56
Light
5:56-6:25
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 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
38 kt
44 mph
Average Winds
60 kt
69 mph
Maximum Winds
84 kt
97 mph
Valid: Aug 31, 15:00 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 (53 kt avg) will significantly reduce flight time and improve fuel efficiency. Light crosswinds averaging 17 kt - minimal impact
Route Wind Breakdown
Tailwinds
92 zones (82%)
Crosswinds
19 zones (17%)
Strong tailwinds averaging 53 kt - faster flight, better fuel efficiency!
Flight Time Impact
53 kt
Avg Tailwind
-42 min
Time Impact
Faster than normal ✓
Wind Range:
• Max Tailwind: 84 kt
• Max Headwind: 0 kt
• Max Crosswind: 76 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)
3%
Smooth (<15%)
3 zones
2%
Light (15-30%)
2 zones
96%
Moderate (30-50%)
107 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

2

Total Strikes

40 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) - 48 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: Aug 31 09:00 - Sep 01 12:00 UTC
09:00 - 12:00 UTC
Wind: 10° at 7 kt
Visibility: 6+ SM
Clouds: FEW 3500 ft, BKN 5000 ft
09:00 - 12:00 UTC
Wind: 10° at 7 kt
Visibility: 6+ SM
Clouds: FEW 3500 ft, BKN 5000 ft
FM 12:00 - 14:00 UTC
Wind: 50° at 6 kt
Visibility: 6+ SM
Clouds: BKN 5000 ft
FM 12:00 - 14:00 UTC
Wind: 50° at 6 kt
Visibility: 6+ SM
Clouds: BKN 5000 ft
FM 14:00 - 17:00 UTC
Wind: 60° at 6 kt
Visibility: 6+ SM
Clouds: BKN 5000 ft
FM 14:00 - 17:00 UTC
Wind: 60° at 6 kt
Visibility: 6+ SM
Clouds: BKN 5000 ft
FM 17:00 - 05:00 UTC
Wind: 160° at 7 kt
Visibility: 6+ SM
Clouds: OVC 5000 ft
FM 17:00 - 05:00 UTC
Wind: 160° at 7 kt
Visibility: 6+ SM
Clouds: OVC 5000 ft
PROB PROB 30% 01:00 - 05:00 UTC
Visibility: 4 SM
Weather: SHRA
Clouds: OVC 2500 ft
PROB PROB 30% 01:00 - 05:00 UTC
Visibility: 4 SM
Weather: SHRA
Clouds: OVC 2500 ft
FM 05:00 - 12:00 UTC
Wind: 210° at 6 kt
Visibility: 4 SM
Weather: SHRA
Clouds: OVC 2500 ft, SCT 1500 ft
FM 05:00 - 12:00 UTC
Wind: 210° at 6 kt
Visibility: 4 SM
Weather: SHRA
Clouds: OVC 2500 ft, SCT 1500 ft
Raw TAF: 
TAF KJFK 310837Z 3109/0112 01007KT P6SM FEW035 BKN050 FM311200 05006KT P6SM BKN050 FM311400 06006KT P6SM BKN050 FM311700 16007KT P6SM OVC050 PROB30 0101/0105 4SM SHRA OVC025 FM010500 21006KT 4SM SHRA SCT015 OVC025
Arrival: EGLL
Forecast Valid: Aug 31 06:00 - Sep 01 12:00 UTC
06:00 - 00:00 UTC
Wind: 270° at 13 kt
Visibility: 6+
Clouds: BKN at 3500 ft
TEMPO PROB 30% 06:00 - 10:00 UTC
Wind: 260° at 15 kt gusting to 25 kt
Visibility: 4.97
Weather: -SHRA
Clouds: BKN at 1000 ft
06:00 - 00:00 UTC
Wind: 270° at 13 kt
Visibility: 6+
Clouds: BKN at 3500 ft
TEMPO PROB 30% 06:00 - 10:00 UTC
Wind: 260° at 15 kt gusting to 25 kt
Visibility: 4.97
Weather: -SHRA
Clouds: BKN at 1000 ft
TEMPO PROB 30% 10:00 - 16:00 UTC
Wind: 260° at 15 kt gusting to 25 kt
Visibility: 3.11
Weather: SHRA
TEMPO PROB 30% 10:00 - 16:00 UTC
Wind: 260° at 15 kt gusting to 25 kt
Visibility: 3.11
Weather: SHRA
BECMG 00:00 - 12:00 UTC
Wind: 210° at 4 kt
Visibility: 6+
Clouds: BKN at 3500 ft
BECMG 00:00 - 12:00 UTC
Wind: 210° at 4 kt
Visibility: 6+
Clouds: BKN at 3500 ft
Raw TAF: 
TAF EGLL 310458Z 3106/0112 27013KT 9999 BKN035 PROB30 TEMPO 3106/3110 26015G25KT 8000 -SHRA BKN010 PROB30 TEMPO 3110/3116 26015G25KT 5000 SHRA BECMG 0100/0103 21004KT
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: 17°C
Wind: 30° at 5 kt
Sky: SCT6000 BKN13000 BKN25000 (Base: 6000 ft)
Flight Category: VFR
Altimeter: 1020.70 inHg (1020 mb)
Observed: Aug 31 13:51 UTC
Raw METAR: 
METAR KJFK 311351Z 03005KT 10SM SCT060 BKN130 BKN250 22/17 A3014 RMK SLP204 T02220167
Arrival: EGLL
Temperature: 24°C (75°F) | Dewpoint: 12°C
Wind: 270° at 16 kt
Sky: FEW4400 (Base: 4400 ft)
Flight Category: VFR
Altimeter: 1013.00 inHg
Observed: Aug 31 14:20 UTC
Raw METAR: 
METAR EGLL 311420Z AUTO 27016KT 250V320 9999 FEW044/// //////CB 24/12 Q1013
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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