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

420 minutes (7h 0m)

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
7.9 /10
Smoothness
Mostly Smooth
24%
Smooth
69%
Light
7%
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

3 hours 15 minutes, 3 hours 40 minutes, and 5 hours 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.

Mostly Smooth

Overall conditions look mostly smooth with occasional light bumps. Nothing to worry about.

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
8 zones (7%)
Light
77 zones (69%)
Smooth
27 zones (24%)
Forecast Valid: Jan 17, 06:00 UTC (Generated: Jan 17, 06:00 UTC)
Flight Timeline 7h 00min
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
Moderate
3:00-3:30
Moderate
3:30-4:00
Moderate
4:00-4:30
Light
4:30-5:00
Moderate
5:00-5:30
Light
5:30-6:00
Light
6:00-6:30
Smooth
Landing
Moderate
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.

Narrow-Body Aircraft (Medium)

Single-aisle mainline jets like this offer a comfortable ride. While you may feel turbulence more than on wide-body aircraft, they are engineered to handle it smoothly.

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
10 kt
12 mph
Average Winds
85 kt
98 mph
Maximum Winds
158 kt
181 mph
Valid: Jan 17, 12:00 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 46 kt - normal for cruise altitude
Route Wind Breakdown
Tailwinds
74 zones (66%)
Crosswinds
37 zones (33%)
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: 112 kt
• Max Headwind: 0 kt
• Max Crosswind: 140 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)
12%
Smooth (<15%)
14 zones
9%
Light (15-30%)
10 zones
77%
Moderate (30-50%)
86 zones
2%
Severe (≥50% prob)
2 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) - 73 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: Jan 17 09:00 - Jan 18 12:00 UTC
09:00 - 12:00 UTC
Wind: 210° at 12 kt
Visibility: 6+ SM
Clouds: FEW 5000 ft, BKN 8000 ft
PROB PROB 30% 09:00 - 12:00 UTC
Visibility: 6 SM
Weather: -SN BR
Clouds: BKN 3000 ft, SCT 2500 ft
09:00 - 12:00 UTC
Wind: 210° at 12 kt
Visibility: 6+ SM
Clouds: BKN 8000 ft, FEW 5000 ft
PROB PROB 30% 09:00 - 12:00 UTC
Visibility: 6 SM
Weather: -SN BR
Clouds: SCT 2500 ft, BKN 3000 ft
09:00 - 12:00 UTC
Wind: 210° at 12 kt
Visibility: 6+ SM
Clouds: FEW 5000 ft, BKN 8000 ft
PROB PROB 30% 09:00 - 12:00 UTC
Visibility: 6 SM
Weather: -SN BR
Clouds: BKN 3000 ft, SCT 2500 ft
FM 12:00 - 15:00 UTC
Wind: 200° at 10 kt
Visibility: 6+ SM
Clouds: BKN 5000 ft, SCT 2500 ft
FM 12:00 - 15:00 UTC
Wind: 200° at 10 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, BKN 5000 ft
FM 12:00 - 15:00 UTC
Wind: 200° at 10 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, BKN 5000 ft
FM 15:00 - 21:00 UTC
Wind: 220° at 11 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, OVC 3500 ft
FM 15:00 - 21:00 UTC
Wind: 220° at 11 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, OVC 3500 ft
FM 15:00 - 21:00 UTC
Wind: 220° at 11 kt
Visibility: 6+ SM
Clouds: SCT 2500 ft, OVC 3500 ft
TEMPO 17:00 - 21:00 UTC
Visibility: 6 SM
Weather: -RA -SN BR
Clouds: BKN 2000 ft
TEMPO 17:00 - 21:00 UTC
Visibility: 6 SM
Weather: -RA -SN BR
Clouds: BKN 2000 ft
TEMPO 17:00 - 21:00 UTC
Visibility: 6 SM
Weather: -RA -SN BR
Clouds: BKN 2000 ft
FM 21:00 - 02:00 UTC
Wind: 240° at 12 kt
Visibility: 6+ SM
Clouds: BKN 3500 ft, SCT 2500 ft
FM 21:00 - 02:00 UTC
Wind: 240° at 12 kt
Visibility: 6+ SM
Clouds: BKN 3500 ft, SCT 2500 ft
FM 21:00 - 02:00 UTC
Wind: 240° at 12 kt
Visibility: 6+ SM
Clouds: BKN 3500 ft, SCT 2500 ft
FM 02:00 - 10:00 UTC
Wind: 260° at 8 kt
Visibility: 6+ SM
Clouds: BKN 25000 ft, SCT 15000 ft
FM 02:00 - 10:00 UTC
Wind: 260° at 8 kt
Visibility: 6+ SM
Clouds: BKN 25000 ft, SCT 15000 ft
FM 02:00 - 10:00 UTC
Wind: 260° at 8 kt
Visibility: 6+ SM
Clouds: BKN 25000 ft, SCT 15000 ft
FM 10:00 - 12:00 UTC
Visibility: 6+ SM
Clouds: BKN 10000 ft
FM 10:00 - 12:00 UTC
Visibility: 6+ SM
Clouds: BKN 10000 ft
FM 10:00 - 12:00 UTC
Visibility: 6+ SM
Clouds: BKN 10000 ft
Raw TAF: 
TAF KJFK 170831Z 1709/1812 21012KT P6SM FEW050 BKN080 PROB30 1709/1712 6SM -SN BR SCT025 BKN030 FM171200 20010KT P6SM SCT025 BKN050 FM171500 22011KT P6SM SCT025 OVC035 TEMPO 1717/1721 6SM -RASN BR BKN020 FM172100 24012KT P6SM SCT025 BKN035 FM180200 26008KT P6SM SCT150 BKN250 FM181000 VRB05KT P6SM BKN100
Arrival: EGLL
Forecast Valid: Jan 17 06:00 - Jan 18 12:00 UTC
06:00 - 22:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: SCT at 3000 ft
TEMPO 06:00 - 11:00 UTC
Clouds: BKN at 1200 ft
TEMPO PROB 30% 06:00 - 10:00 UTC
Visibility: 3.11
Weather: -RA -DZ RA
Clouds: BKN at 600 ft
06:00 - 22:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: SCT at 3000 ft
TEMPO 06:00 - 11:00 UTC
Clouds: BKN at 1200 ft
TEMPO PROB 30% 06:00 - 10:00 UTC
Visibility: 3.11
Weather: -RA -DZ RA
Clouds: BKN at 600 ft
06:00 - 22:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: SCT at 3000 ft
TEMPO 06:00 - 11:00 UTC
Clouds: BKN at 1200 ft
TEMPO PROB 30% 06:00 - 10:00 UTC
Visibility: 3.11
Weather: -RA -DZ RA
Clouds: BKN at 600 ft
TEMPO PROB 30% 10:00 - 16:00 UTC
Visibility: 4.35
Weather: SHRA
Clouds: SCT at 800 ft BKN at 1200 ft
TEMPO PROB 30% 10:00 - 16:00 UTC
Visibility: 4.35
Weather: SHRA
Clouds: SCT at 800 ft BKN at 1200 ft
TEMPO PROB 30% 10:00 - 16:00 UTC
Visibility: 4.35
Weather: SHRA
Clouds: BKN at 1200 ft SCT at 800 ft
TEMPO PROB 30% 17:00 - 22:00 UTC
Visibility: 4.97
Clouds: BKN at 800 ft
TEMPO PROB 30% 17:00 - 22:00 UTC
Visibility: 4.97
Clouds: BKN at 800 ft
TEMPO PROB 30% 17:00 - 22:00 UTC
Visibility: 4.97
Clouds: BKN at 800 ft
BECMG 22:00 - 09:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: BKN at 600 ft
TEMPO 22:00 - 04:00 UTC
Visibility: 4.35
BECMG 22:00 - 09:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: BKN at 600 ft
TEMPO 22:00 - 04:00 UTC
Visibility: 4.35
BECMG 22:00 - 09:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: BKN at 600 ft
TEMPO 22:00 - 04:00 UTC
Visibility: 4.35
TEMPO PROB 30% 23:00 - 10:00 UTC
Visibility: 1.86
Weather: BR -DZ
TEMPO PROB 30% 23:00 - 10:00 UTC
Visibility: 1.86
Weather: BR -DZ
TEMPO PROB 30% 23:00 - 10:00 UTC
Visibility: 1.86
Weather: BR -DZ
TEMPO 00:00 - 09:00 UTC
Clouds: BKN at 400 ft
TEMPO 00:00 - 09:00 UTC
Clouds: BKN at 400 ft
TEMPO 00:00 - 09:00 UTC
Clouds: BKN at 400 ft
TEMPO 04:00 - 12:00 UTC
Visibility: 3.73
Weather: -RA -DZ
TEMPO 04:00 - 12:00 UTC
Visibility: 3.73
Weather: -RA -DZ
TEMPO 04:00 - 12:00 UTC
Visibility: 3.73
Weather: -RA -DZ
BECMG 09:00 - 12:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: SCT at 2500 ft
BECMG 09:00 - 12:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: SCT at 2500 ft
BECMG 09:00 - 12:00 UTC
Wind: 150° at 7 kt
Visibility: 6+
Clouds: SCT at 2500 ft
Raw TAF: 
TAF EGLL 170454Z 1706/1812 15007KT 9999 SCT030 TEMPO 1706/1711 BKN012 PROB30 TEMPO 1706/1710 5000 -RADZ RA BKN006 PROB30 TEMPO 1710/1716 7000 SHRA SCT008 BKN012 PROB30 TEMPO 1717/1722 8000 BKN008 BECMG 1722/1801 BKN006 TEMPO 1722/1804 7000 PROB30 TEMPO 1723/1810 3000 BR -DZ TEMPO 1800/1809 BKN004 TEMPO 1804/1812 6000 -RADZ BECMG 1809/1812 SCT025
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: -6°C
Wind: 250° at 3 kt
Sky: SCT5000 BKN7000 (Base: 5000 ft)
Flight Category: VFR
Altimeter: 1018.70 inHg (1018 mb)
Observed: Jan 17 09:51 UTC
Raw METAR: 
METAR KJFK 170951Z 25003KT 10SM SCT050 BKN070 02/M06 A3008 RMK AO2 SLP185 T00171056 $
Arrival: EGLL
Temperature: 9°C (48°F) | Dewpoint: 7°C
Wind: 150° at 7 kt
Sky: BKN1300 (Base: 1300 ft)
Flight Category: MVFR
Altimeter: 1014.00 inHg
Observed: Jan 17 10:20 UTC
Raw METAR: 
METAR EGLL 171020Z AUTO 15007KT 9999 BKN013/// //////TCU 09/07 Q1014 TEMPO FEW013
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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