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

475 minutes (7h 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
8.2 /10
Smoothness
Smooth Flight
29%
Smooth
71%
Light
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

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 64 knots. These winds are favorable and may get you there up to 43 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
71% of your flight
Peak Intensity
LIGHT
Comfortable flight expected
Route Breakdown (112 zones)
Light
80 zones (71%)
Smooth
32 zones (29%)
Forecast Valid: Mar 03, 18:00 UTC (Generated: Mar 03, 18:00 UTC)
Flight Timeline 7h 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
Light
2:30-3:00
Light
3:00-3:30
Light
3:30-4:00
Light
4:00-4:30
Light
4:30-5:00
Light
5:00-5:29
Light
5:29-5:58
Light
5:58-6:27
Light
6:27-6:56
Light
6:56-7:25
Smooth
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.

Wide-Body Aircraft (Large)

Large, twin-aisle aircraft like this generally provide the smoothest ride through turbulence due to their size, weight, and advanced stabilization systems.

Safety First: All commercial aircraft, regardless of size, are engineered and certified to safely handle turbulence. The difference is primarily in passenger comfort - larger aircraft provide a smoother feeling ride, but all aircraft are equally safe.

Important: Aircraft information is based on historical flight data and may not reflect the current assignment. Airlines may change aircraft types based on operational needs. Always verify with your airline for the most current aircraft information.
Learn more about aircraft size and comfort
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
9 kt
11 mph
Average Winds
64 kt
74 mph
Maximum Winds
101 kt
117 mph
Valid: Mar 03, 18:00 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 (54 kt avg) will significantly reduce flight time and improve fuel efficiency. Light crosswinds averaging 31 kt - minimal impact
Route Wind Breakdown
Tailwinds
91 zones (81%)
Crosswinds
20 zones (18%)
Strong tailwinds averaging 54 kt - faster flight, better fuel efficiency!
Flight Time Impact
54 kt
Avg Tailwind
-43 min
Time Impact
Faster than normal ✓
Wind Range:
• Max Tailwind: 81 kt
• Max Headwind: 0 kt
• Max Crosswind: 81 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
4%
Light (15-30%)
5 zones
86%
Moderate (30-50%)
96 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...
Pilot Reports (PIREPs) - 54 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: Mar 03 18:00 - Mar 05 00:00 UTC
18:00 - 23:00 UTC
Wind: 90° at 5 kt
Visibility: 2 SM
Weather: -RA BR
Clouds: OVC 800 ft
18:00 - 23:00 UTC
Wind: 90° at 5 kt
Visibility: 2 SM
Weather: -RA BR
Clouds: OVC 800 ft
TEMPO 19:00 - 23:00 UTC
Weather: RA BR
Clouds: OVC 400 ft
TEMPO 19:00 - 23:00 UTC
Weather: RA BR
Clouds: OVC 400 ft
FM 23:00 - 01:00 UTC
Wind: 110° at 5 kt
Visibility: 1.5 SM
Weather: -RA BR
Clouds: OVC 400 ft
FM 23:00 - 01:00 UTC
Wind: 110° at 5 kt
Visibility: 1.5 SM
Weather: -RA BR
Clouds: OVC 400 ft
FM 01:00 - 09:00 UTC
Visibility: 2 SM
Weather: -RA BR
Clouds: OVC 300 ft
FM 01:00 - 09:00 UTC
Visibility: 2 SM
Weather: -RA BR
Clouds: OVC 300 ft
FM 09:00 - 13:00 UTC
Wind: 270° at 4 kt
Visibility: 2 SM
Weather: BR
Clouds: OVC 600 ft
FM 09:00 - 13:00 UTC
Wind: 270° at 4 kt
Visibility: 2 SM
Weather: BR
Clouds: OVC 600 ft
FM 13:00 - 16:00 UTC
Wind: 320° at 6 kt
Visibility: 4 SM
Weather: BR
Clouds: FEW 600 ft, BKN 1500 ft
FM 13:00 - 16:00 UTC
Wind: 320° at 6 kt
Visibility: 4 SM
Weather: BR
Clouds: FEW 600 ft, BKN 1500 ft
FM 16:00 - 00:00 UTC
Wind: 360° at 5 kt
Visibility: 6+ SM
Clouds: FEW 2000 ft, SCT 25000 ft
FM 16:00 - 00:00 UTC
Wind: 360° at 5 kt
Visibility: 6+ SM
Clouds: FEW 2000 ft, SCT 25000 ft
Raw TAF: 
TAF KJFK 031739Z 0318/0424 09005KT 2SM -RA BR OVC008 TEMPO 0319/0323 RA BR OVC004 FM032300 11005KT 1 1/2SM -RA BR OVC004 FM040100 VRB05KT 2SM -RA BR OVC003 FM040900 27004KT 2SM BR OVC006 FM041300 32006KT 4SM BR FEW006 BKN015 FM041600 36005KT P6SM FEW020 SCT250
Arrival: EGLL
Forecast Valid: Mar 03 18:00 - Mar 05 00:00 UTC
18:00 - 00:00 UTC
Wind: 80° at 7 kt
Visibility: 6+
Clouds: FEW at 4000 ft
18:00 - 00:00 UTC
Wind: 80° at 7 kt
Visibility: 6+
Clouds: FEW at 4000 ft
TEMPO PROB 30% 23:00 - 01:00 UTC
Clouds: BKN at 1000 ft
TEMPO PROB 30% 23:00 - 01:00 UTC
Clouds: BKN at 1000 ft
TEMPO 01:00 - 10:00 UTC
Visibility: 3.73
Clouds: BKN at 600 ft
TEMPO 01:00 - 10:00 UTC
Visibility: 3.73
Clouds: BKN at 600 ft
TEMPO PROB 30% 03:00 - 09:00 UTC
Visibility: 1.86
Weather: -DZ BR
Clouds: BKN at 300 ft
TEMPO PROB 30% 03:00 - 09:00 UTC
Visibility: 1.86
Weather: -DZ BR
Clouds: BKN at 300 ft
TEMPO PROB 30% 10:00 - 12:00 UTC
Clouds: BKN at 900 ft
TEMPO PROB 30% 10:00 - 12:00 UTC
Clouds: BKN at 900 ft
Raw TAF: 
TAF EGLL 031653Z 0318/0424 08007KT 9999 FEW040 PROB30 TEMPO 0323/0401 BKN010 TEMPO 0401/0410 6000 BKN006 PROB30 TEMPO 0403/0409 3000 -DZ BR BKN003 PROB30 TEMPO 0410/0412 BKN009
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: 2°C (35°F) | Dewpoint: 2°C
Wind: 70° at 7 kt
Visibility: 3 SM
Sky: BKN500 BKN1700 OVC2200 (Base: 500 ft)
Flight Category: IFR
Altimeter: 1029.90 inHg (1030 mb)
Observed: Mar 03 19:51 UTC
Raw METAR: 
METAR KJFK 031951Z 07007KT 3SM -RA BR BKN005 BKN017 OVC022 02/02 A3041 RMK AO2 SFC VIS 4 SLP295 P0003 T00220017
Arrival: EGLL
Temperature: 9°C (48°F) | Dewpoint: 4°C
Wind: 100° at 7 kt
Sky: CLR
Flight Category: VFR
Altimeter: 1028.00 inHg
Observed: Mar 03 19:20 UTC
Raw METAR: 
METAR EGLL 031920Z COR AUTO 10007KT 9999 NCD 09/04 Q1028 NOSIG
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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