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
8.1 /10
Smoothness
Smooth Flight
29%
Smooth
68%
Light
4%
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 and 3 hours 45 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 a bit bumpy initially, with calm conditions around the airport.

Winds Aloft

Winds at cruising altitude are about 48 knots. These winds are favorable and may get you there up to 27 minutes early.

Landing

Landing should feel smooth 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
68% of your flight
Peak Intensity
MODERATE
Brief sections only
Route Breakdown (112 zones)
Moderate
4 zones (4%)
Light
76 zones (68%)
Smooth
32 zones (29%)
Forecast Valid: Jul 17, 00:00 UTC (Generated: Jul 17, 00:00 UTC)
Flight Timeline 7h 20min
Maximum turbulence expected per segment
Takeoff
Moderate
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
Moderate
3:56-4:25
Light
4:25-4:54
Smooth
4:54-5:23
Light
5:23-5:52
Light
5:52-6:21
Light
6:21-6:50
Light
Landing
Smooth
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
2 kt
2 mph
Average Winds
48 kt
55 mph
Maximum Winds
111 kt
128 mph
Valid: Jul 17, 03:00 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 GOOD
Wind Assessment: Favorable tailwinds (33 kt avg) provide good conditions for this flight. Light crosswinds averaging 30 kt - minimal impact
Route Wind Breakdown
Tailwinds
61 zones (54%)
Headwinds
2 zones (2%)
Crosswinds
48 zones (43%)
Moderate tailwinds averaging 33 kt - good conditions for this route
Flight Time Impact
33 kt
Avg Tailwind
-27 min
Time Impact
Faster than normal ✓
Wind Range:
• Max Tailwind: 74 kt
• Max Headwind: 8 kt
• Max Crosswind: 84 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)
20%
Smooth (<15%)
22 zones
8%
Light (15-30%)
9 zones
71%
Moderate (30-50%)
79 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 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 - 45,000 ft (FL000 - FL450)
Valid: Jul 17, 00:55 UTC - 02:55 UTC
Movement: NW (300°) at 30 kt (~34 mph)
Raw SIGMET: WSUS31 KKCI 170055 SIGE CONVECTIVE SIGMET 6E VALID UNTIL 0255Z NJ AND MA RI DE NJ NY CSTL WTRS FROM 30SSW JFK-150S ACK-140ESE SIE-20W SIE-30SSW JFK AREA SEV TS MOV FROM 30030KT. TOPS ABV FL450. HAIL TO 0.75 IN...WIND GUSTS TO 50KT POSS. OUTLOOK VALID 170255-170655 AREA 1...FROM 140ESE ACK-190SE ACK-80SE SBY-40NE RIC-30W EMI-140ESE ACK WST ISSUANCES POSS. REFER TO MOST RECENT ACUS01 KWNS FROM STORM PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS. AREA 2...FROM 40SW GIJ-30SSE APE-60ESE PBI-50NNE EYW-100SSE CEW-VUZ-40SW GIJ WST ISSUANCES POSS. REFER TO MOST RECENT ACUS01 KWNS FROM STORM PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS.
Active Turbulence Warnings (AIRSIGMETs) Loading...
Pilot Reports (PIREPs) - 134 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: Jul 17 00:00 - Jul 18 06:00 UTC
00:00 - 06:00 UTC
Wind: 320° at 9 kt
Visibility: 3 SM
Weather: FU
Clouds: SCT 3000 ft, OVC 25000 ft
TEMPO 00:00 - 04:00 UTC
Visibility: 2 SM
Weather: FU
Clouds: BKN 3000 ft
FM 06:00 - 13:00 UTC
Wind: 340° at 6 kt
Visibility: 5 SM
Weather: FU
Clouds: BKN 25000 ft
FM 13:00 - 18:00 UTC
Wind: 340° at 8 kt
Visibility: 6+ SM
Clouds: SCT 25000 ft
FM 18:00 - 00:00 UTC
Wind: 210° at 11 kt
Visibility: 6+ SM
Clouds: FEW 5000 ft, SCT 25000 ft
FM 00:00 - 06:00 UTC
Wind: 200° at 8 kt
Visibility: 5 SM
Weather: FU
Clouds: SCT 25000 ft
Raw TAF: 
TAF KJFK 162332Z 1700/1806 32009KT 3SM FU SCT030 OVC250 TEMPO 1700/1704 2SM FU BKN030 FM170600 34006KT 5SM FU BKN250 FM171300 34008KT P6SM SCT250 FM171800 21011KT P6SM FEW050 SCT250 FM180000 20008KT 5SM FU SCT250
Arrival: EGLL
Forecast Valid: Jul 17 00:00 - Jul 18 06:00 UTC
00:00 - 11:00 UTC
Wind: 30° at 5 kt
Visibility: 6+
Weather: NSW
Clouds: NSC
TEMPO PROB 30% 03:00 - 08:00 UTC
Clouds: BKN at 600 ft
BECMG 11:00 - 19:00 UTC
Wind: 330° at 10 kt
Visibility: 6+
Weather: NSW
Clouds: NSC
BECMG 19:00 - 06:00 UTC
Wind: 70° at 10 kt
Visibility: 6+
Weather: NSW
Clouds: NSC
Raw TAF: 
TAF EGLL 162255Z 1700/1806 03005KT CAVOK PROB30 TEMPO 1703/1708 BKN006 BECMG 1711/1714 33010KT BECMG 1719/1722 07010KT
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: 29°C (84°F) | Dewpoint: 12°C
Wind: 310° at 10 kt
Visibility: 2 SM
Sky: BKN3300 OVC5500 (Base: 3300 ft)
Flight Category: IFR
Altimeter: 1012.30 inHg (1012 mb)
Observed: Jul 17 00:51 UTC
Raw METAR: 
METAR KJFK 170051Z 31010KT 2SM FU BKN033 OVC055 29/12 A2989 RMK AO2 SFC VIS 3 SLP120 FU BKN033 T02890122 $
Arrival: EGLL
Temperature: 20°C (68°F) | Dewpoint: 11°C
Wind: 30° at 4 kt
Sky: CLR
Flight Category: VFR
Altimeter: 1017.00 inHg
Observed: Jul 16 23:50 UTC
Raw METAR: 
METAR EGLL 162350Z AUTO 03004KT 330V060 9999 NCD 20/11 Q1017
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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