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Washington, United States
DCA (Washington, United States) sits at 38.85°N, 77.04°W, 15 ft elevation — coastal with the Appalachians nearby.
Major airport serving Washington, United States.
Computed from DCA's geography and climate
Washington sits squarely under the mid-latitude-latitude jet, north of which most long-haul corridors run. Clear-air turbulence (CAT) at cruise is the most common source of bumps on departures from here, especially during December–February when the jet is at its strongest. The Appalachians sit upwind of DCA on prevailing flow days, generating mountain-wave turbulence that can extend several hundred kilometres downwind at cruise level. The lee-wave risk is highest when December–February winds at FL300 cross the Appalachians at near-perpendicular angles. Warm-season convection (June–August) drives the dominant turbulence pattern from DCA — afternoon thunderstorm cells are routed around but their wake turbulence and gust fronts can still affect arrivals and departures. DCA's coastal position means departures often transit from the cool marine boundary layer into warmer continental air within minutes of takeoff — a brief but reliable bumpy transition on warm-season afternoons when the sea breeze is set up.
Standard Instrument Departures (SIDs) often route around terrain; on strong-wind days, low-level turbulence in the lee of the hills is common in the first few thousand feet.
Winter (December–February) brings the strongest jet-stream activity — that's when long-haul departures most often log clear-air turbulence at cruise. Summer (June–August) is peak thunderstorm season — convective turbulence is the dominant warm-season risk. Mountain-wave activity near the Appalachians peaks in the cold season when upper-level winds blow hardest across the range.
Get a real-time turbulence forecast for any scheduled flight out of Ronald Reagan Washington National Airport, with live wind, jet-stream analysis and pilot reports.
Ronald Reagan Washington National Airport is best described as a jet-stream + mountain-wave corridor. Washington sits squarely under the mid-latitude-latitude jet, north of which most long-haul corridors run. Clear-air turbulence (CAT) at cruise is the most common source of bumps on departures from here, especially during December–February when the jet is at its strongest. The Appalachians sit upwind of DCA on prevailing flow days, generating mountain-wave turbulence that can extend several hundred kilometres downwind at cruise level. The lee-wave risk is highest when December–February winds at FL300 cross the Appalachians at near-perpendicular angles. Warm-season convection (June–August) drives the dominant turbulence pattern from DCA — afternoon thunderstorm cells are routed around but their wake turbulence and gust fronts can still affect arrivals and departures. DCA's coastal position means departures often transit from the cool marine boundary layer into warmer continental air within minutes of takeoff — a brief but reliable bumpy transition on warm-season afternoons when the sea breeze is set up.
Winter (December–February) brings the strongest jet-stream activity — that's when long-haul departures most often log clear-air turbulence at cruise. Summer (June–August) is peak thunderstorm season — convective turbulence is the dominant warm-season risk. Mountain-wave activity near the Appalachians peaks in the cold season when upper-level winds blow hardest across the range. Peak turbulence window: November–February (strong jet). Typically calmest: May–September.
Yes — the Appalachians lie close enough to generate mountain-wave turbulence on days with strong upper-level winds. These waves can propagate hundreds of kilometres downwind, so they sometimes affect cruise even after you've left the immediate area.
We combine live NOAA Aviation Weather Center data (PIREPs, SIGMETs, AIRMETs) with physics-based Ellrod and Richardson-number calculations derived from Open-Meteo pressure-level wind and temperature data. If a source is unavailable for a waypoint we show an em dash rather than invent a number.
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