Hong Kong → San Francisco Turbulence Forecast
General route view · UA878 · United Airlines · Live tracking: FlightAware
✓ Mostly Calm
15:00
Almost entirely calm; a brief bump or two — uncomfortable, never dangerous.
→ What is turbulence?What is turbulence?
4 min · Learn
Turbulence from a pilot's view
4 min · Learn
Recognizing the flight panic loop
5 min · Learn
How dangerous is turbulence, really? 43 years of data
6 min · Learn
What's in the pilot briefing? What you don't see
5 min · Learn
What is the jet stream, and why do you feel it at cruise?
5 min · Learn
24 hours before your flight
5 min · Guides
What to do during turbulence: 4 steps
4 min · Guides
My first flight: a step-by-step guide for first-timers
7 min · Guides
General route view · UA878 · United Airlines · Live tracking: FlightAware
15:00
Almost entirely calm; a brief bump or two — uncomfortable, never dangerous.
→ What is turbulence?TAKEOFF
Smooth
First 20 min
CRUISE
Brief
14h 20m
LANDING
Smooth
Last 20 min
Hong Kong → San Francisco route, 11,128 km. Crosses the South China Sea, the Indian subcontinent, and the Arabian Peninsula. Winter jet stream may cause light bumps at cruise altitude; summer is typically smooth.
Is turbulence dangerous?
Modern aircraft are engineered to handle even the heaviest turbulence. Turbulence is uncomfortable, but not a structural threat. Pilots can change altitude or routing to find calmer air.
Which times of day are smoothest?
Early morning and night flights tend to be smoother — thermal currents from solar heating can cause mild bumps on afternoon departures.
Why are there light bumps at cruise altitude?
At cruise altitude (around 10-12 km), wind shear from the jet stream can produce brief clear-air turbulence. It usually lasts a few minutes; the pilot turns on the seatbelt sign, sometimes adjusts routing.
How reliable is this forecast?
The forecast is computed from the winds of the same global weather model airlines use for flight planning. No weather forecast is 100%; treat this as direction, not a guarantee.
How do pilots know about turbulence ahead of time?
Before each flight, pilots get a wind map briefing, ICAO SIGMET (significant meteorological advisories), and pilot reports (PIREPs) from other aircraft. In flight, they stay in active contact with ATC and nearby aircraft.
Learn
What is turbulence?
4 min
Learn
Turbulence from a pilot's view
4 min
Learn
Recognizing the flight panic loop
5 min
Learn
How dangerous is turbulence, really? 43 years of data
6 min
Learn
What's in the pilot briefing? What you don't see
5 min
Learn
What is the jet stream, and why do you feel it at cruise?
5 min
Guides
24 hours before your flight
5 min
Guides
What to do during turbulence: 4 steps
4 min
Guides
My first flight: a step-by-step guide for first-timers
7 min
Data: global weather model (ECMWF) · Generated Sat 10:16