[{"data":1,"prerenderedAt":470},["ShallowReactive",2],{"learn-\u002Flearn\u002Fsea-and-land-breezes":3,"learn-nav-\u002Flearn\u002Fsea-and-land-breezes":438},{"id":4,"title":5,"body":6,"date":370,"dateModified":371,"description":372,"draft":373,"extension":374,"faqs":375,"howTo":371,"keyTakeaways":385,"meta":391,"metaDescription":392,"navigation":393,"path":394,"quiz":395,"seo":421,"series":371,"seriesOrder":371,"sources":422,"stem":435,"topic":436,"__hash__":437},"learn\u002Flearn\u002Fsea-and-land-breezes.md","Sea and land breezes",{"type":7,"value":8,"toc":356},"minimark",[9,13,19,24,40,44,87,91,122,126,163,167,201,205,228,232,254,258,272,303,307,341,345],[10,11,12],"p",{},"Spend a summer day at a coastal airfield and you will feel the wind swing onshore by the afternoon and then fall away and reverse overnight. That daily rhythm is the sea and land breeze, a local circulation driven by nothing more than the different way land and water respond to the sun. It is small in scale but real in its effect on a coastal aerodrome.",[14,15,16],"blockquote",{},[10,17,18],{},"This is general educational information, not operational, legal, or regulatory advice. Rules differ by authority and change over time. Always verify against current official sources and follow your operator's approved procedures.",[20,21,23],"h2",{"id":22},"the-cause-land-and-sea-heat-differently","The cause: land and sea heat differently",[10,25,26,27,31,32,35,36,39],{},"The whole phenomenon comes from one fact: ",[28,29,30],"strong",{},"land heats and cools much faster than water",". The sun warms a land surface quickly, and that surface warms the air above it; water, with its huge thermal inertia and its ability to mix and to let light penetrate, warms far more slowly and stays a more even temperature. At night the reverse holds: the land ",[28,33,34],{},"cools"," quickly while the sea holds its warmth. That difference in temperature between the air over the land and the air over the sea is the engine of the breeze, and because the sun drives it, the circulation runs on a ",[28,37,38],{},"daily (diurnal)"," cycle.",[20,41,43],{"id":42},"the-sea-breeze","The sea breeze",[10,45,46,47,50,51,54,55,58,59,62,63,66,67,70,71,74,75,78,79,82,83,86],{},"By ",[28,48,49],{},"day",", the land warms faster, so the air over the land becomes ",[28,52,53],{},"warm and rises",". Rising air leaves slightly ",[28,56,57],{},"lower pressure"," near the surface over the land, and the cooler, denser air sitting over the sea ",[28,60,61],{},"flows in"," to fill the gap. That inflow, from ",[28,64,65],{},"sea to land",", is the ",[28,68,69],{},"sea breeze",": an ",[28,72,73],{},"onshore"," wind. It does not appear at dawn; it builds as the land heats through the morning, is usually ",[28,76,77],{},"strongest in the afternoon",", and can reach ",[28,80,81],{},"tens of kilometres inland"," by late in the day. The air it brings is ",[28,84,85],{},"cooler and moister"," than the air it replaces, which is why a hot coastal afternoon can suddenly turn fresh when the sea breeze sets in.",[20,88,90],{"id":89},"the-sea-breeze-front","The sea-breeze front",[10,92,93,94,97,98,101,102,105,106,109,110,113,114,117,118,121],{},"As the cool marine air pushes inland, it meets the ",[28,95,96],{},"warmer air over the land",", and the boundary between them is the ",[28,99,100],{},"sea-breeze front",". It behaves like a miniature cold front: the cool, dense sea air ",[28,103,104],{},"undercuts"," the warm inland air and lifts it, so the front is often marked by a ",[28,107,108],{},"wind shift",", a ",[28,111,112],{},"line of cumulus"," cloud, and sometimes ",[28,115,116],{},"showers"," triggered by the lifting. Inland, the convergence along the front can be enough to ",[28,119,120],{},"set off convection"," on a warm, unstable day. For a pilot this matters because the front is a moving line where the wind, the cloud and the turbulence all change, and it can pass over an inland aerodrome during the afternoon.",[20,123,125],{"id":124},"the-land-breeze","The land breeze",[10,127,128,129,132,133,136,137,140,141,144,145,66,148,70,151,154,155,158,159,162],{},"At ",[28,130,131],{},"night",", the cycle reverses. The land ",[28,134,135],{},"cools faster"," than the sea, so now the air over the ",[28,138,139],{},"warmer sea"," rises, and cooler air ",[28,142,143],{},"flows out from the land"," to replace it. That outflow, from ",[28,146,147],{},"land to sea",[28,149,150],{},"land breeze",[28,152,153],{},"offshore"," wind, usually developing overnight and into the early morning. The land breeze is generally ",[28,156,157],{},"weaker"," than the sea breeze, because the night-time temperature difference between land and sea is ",[28,160,161],{},"smaller"," than the strong daytime contrast. It is the gentler, quieter half of the daily cycle, but it is real, and it explains why an offshore breeze often greets an early start at the coast.",[20,164,166],{"id":165},"what-it-means-for-a-coastal-aerodrome","What it means for a coastal aerodrome",[10,168,169,170,173,174,177,178,181,182,187,188,191,192,196,197,200],{},"The practical upshot for flying is that at a coastal aerodrome the ",[28,171,172],{},"wind can reverse"," between day and night, swinging onshore with the afternoon sea breeze and offshore with the overnight land breeze. That changes the ",[28,175,176],{},"runway in use"," and the ",[28,179,180],{},"crosswind"," through the day, so the ",[183,184,186],"a",{"href":185},"\u002Flearn\u002Fcrosswind-components","crosswind component"," you plan for the morning may not be the one you meet in the afternoon. The sea breeze can also ",[28,189,190],{},"advect sea fog"," inland off a cold sea, bringing low visibility that our guide to ",[183,193,195],{"href":194},"\u002Flearn\u002Ffog-mist-and-the-dewpoint-spread","fog, mist and the dewpoint spread"," explains, and the sea-breeze front can bring gusts, a wind shift on approach, and inland convection. None of this is dramatic individually, but together it makes a coastal aerodrome's weather notably ",[28,198,199],{},"time-of-day dependent",".",[20,202,204],{"id":203},"when-the-sea-breeze-is-strongest","When the sea breeze is strongest",[10,206,207,208,211,212,215,216,219,220,223,224,227],{},"The sea breeze is not the same strength every day, and a few conditions favour a vigorous one. A ",[28,209,210],{},"clear, sunny day"," heats the land hard and builds a big land-sea temperature contrast, the engine of the breeze, so the strongest sea breezes come on warm, sunny afternoons, often in ",[28,213,214],{},"spring and summer"," when the sea is still relatively cool. A ",[28,217,218],{},"light gradient wind",", the broad-scale wind set by the pressure systems, lets the local breeze dominate; a strong gradient wind can overwhelm it or, depending on direction, either ",[28,221,222],{},"reinforce"," an onshore flow or ",[28,225,226],{},"hold the sea breeze offshore"," so it never comes in. So when you read a calm, sunny forecast at the coast, expect a sea breeze to build; when the gradient wind is strong, the local breeze may be masked.",[20,229,231],{"id":230},"a-family-of-local-winds","A family of local winds",[10,233,234,235,238,239,242,243,246,247,242,250,253],{},"The sea and land breeze is one member of a larger family of ",[28,236,237],{},"thermally driven local winds"," that come from the same idea, surfaces heating and cooling at different rates. In hilly country, ",[28,240,241],{},"anabatic"," winds flow ",[28,244,245],{},"up"," sunlit slopes by day as the slope heats the air against it, and ",[28,248,249],{},"katabatic",[28,251,252],{},"down"," slopes and valleys by night as the cooled, denser air drains downhill, often pooling cold air and fog in the valley floor. Like the sea breeze, these are gentle, predictable and tied to the time of day, and they matter at aerodromes set among hills or in valleys for the same reasons: a wind that changes with the sun. Recognising the sea breeze as one of this family makes the whole set easier to anticipate.",[20,255,257],{"id":256},"a-worked-example","A worked example",[10,259,260,261,264,265,267,268,271],{},"You are planning two flights from a coastal airfield, one mid-morning and one late afternoon. At ",[28,262,263],{},"dawn"," there is a light ",[28,266,153],{}," land breeze, the tail end of the night-time circulation. By ",[28,269,270],{},"mid-morning"," it has died away to near calm as the land warms and the system turns over.",[10,273,46,274,277,278,280,281,283,284,286,287,289,290,292,293,295,296,299,300,302],{},[28,275,276],{},"early afternoon"," the ",[28,279,69],{}," has set in: a steady ",[28,282,73],{}," wind, cooler and fresher, that has backed or veered the surface wind to blow in from the sea and freshened to a useful strength. The ",[28,285,176],{}," has changed to face it, and your ",[28,288,180],{}," for the afternoon flight is different from the morning's, so you re-check it. Inland, a ",[28,291,112],{}," marks the ",[28,294,100],{}," advancing across the countryside, with a wind shift and a few showers along it that you note for the inland leg. By ",[28,297,298],{},"evening",", as the land cools, the sea breeze fades and, overnight, the gentle ",[28,301,150],{}," returns. One airfield, one day, and the wind told the time.",[20,304,306],{"id":305},"common-pitfalls","Common pitfalls",[308,309,310,317,323,329,335],"ul",{},[311,312,313,316],"li",{},[28,314,315],{},"Assuming the morning wind holds all day."," A sea breeze can set in by afternoon and change the runway and crosswind.",[311,318,319,322],{},[28,320,321],{},"Forgetting the front."," The sea-breeze front brings a wind shift, cumulus and sometimes showers, and can trigger inland convection.",[311,324,325,328],{},[28,326,327],{},"Overlooking advected sea fog."," A sea breeze off a cold sea can carry low visibility inland.",[311,330,331,334],{},[28,332,333],{},"Expecting a strong land breeze."," It is the weaker half of the cycle, driven by a smaller night-time temperature difference.",[311,336,337,340],{},[28,338,339],{},"Treating it as only a coastal curiosity."," The sea breeze can reach well inland and affect aerodromes some distance from the coast.",[20,342,344],{"id":343},"in-pilot-efb","In Pilot EFB",[10,346,347,348,352,353,355],{},"Pilot EFB is a study and planning companion that helps you anticipate local effects like the sea breeze behind a forecast, alongside the decoded ",[183,349,351],{"href":350},"\u002Flearn\u002Fhow-to-read-a-metar","METAR",", your ",[183,354,180],{"href":185}," notes and the rest of your briefing in one offline-first place. A briefing you have already pulled stays readable away from a signal, and pulling fresh weather needs a connection. Pilot EFB does not forecast the weather and is not a certified Electronic Flight Bag, so treat it as a study and planning aid and brief from your official source of record.",{"title":357,"searchDepth":358,"depth":358,"links":359},"",2,[360,361,362,363,364,365,366,367,368,369],{"id":22,"depth":358,"text":23},{"id":42,"depth":358,"text":43},{"id":89,"depth":358,"text":90},{"id":124,"depth":358,"text":125},{"id":165,"depth":358,"text":166},{"id":203,"depth":358,"text":204},{"id":230,"depth":358,"text":231},{"id":256,"depth":358,"text":257},{"id":305,"depth":358,"text":306},{"id":343,"depth":358,"text":344},"2026-05-23",null,"Why coastal winds reverse between day and night, how a sea breeze and a sea-breeze front form, and what the diurnal circulation means for a coastal aerodrome.",false,"md",[376,379,382],{"q":377,"a":378},"What causes a sea breeze?","Differential heating. During the day the land heats up faster than the sea, so the air over the land warms and rises, lowering the pressure there, and cooler air flows in from the sea to replace it. That inflow from sea to land is the sea breeze. It is an onshore wind that builds through the day, typically strongest in the afternoon, and it can push tens of kilometres inland.",{"q":380,"a":381},"How is a land breeze different from a sea breeze?","A land breeze is the night-time reversal. After dark the land cools faster than the sea, so the air over the now-warmer sea rises and cooler air flows out from the land to take its place, giving an offshore wind. A land breeze is generally weaker than a sea breeze, because the temperature difference between land and sea is smaller at night than the strong daytime contrast that drives the sea breeze.",{"q":383,"a":384},"Why does a sea-breeze front matter to a pilot?","Where the cool marine air of a sea breeze pushes inland and meets the warmer air over the land, a boundary called the sea-breeze front can form, often marked by a wind shift, a line of cumulus cloud and sometimes triggered showers. At a coastal aerodrome it can mean the wind direction and crosswind change during the day, and inland it can set off convection, so it is worth anticipating rather than being surprised by.",[386,387,388,389,390],"By day the land heats faster than the sea, drawing in a cooler onshore sea breeze that builds through the afternoon.","By night the land cools faster, giving a weaker offshore land breeze.","Where the sea breeze pushes inland it can form a sea-breeze front, with a wind shift, a line of cumulus and sometimes showers.","At a coastal aerodrome the wind, and the runway in use, can reverse between day and night.","It is one of a family of thermally driven local winds, alongside anabatic and katabatic slope winds.",{},"Why coastal winds reverse between day and night, how a sea breeze and sea-breeze front form, and what they mean for a coastal aerodrome.",true,"\u002Flearn\u002Fsea-and-land-breezes",[396,405,413],{"q":397,"options":398,"answer":403,"explanation":404},"During the day, which way does a sea breeze blow?",[399,400,401,402],"From the land out to the sea","From the sea in toward the land","Straight up","Parallel to the coast only",1,"By day the land heats faster than the sea, the air over the land rises, and cooler air flows in from the sea, so the sea breeze is an onshore wind, from the sea toward the land.",{"q":406,"options":407,"answer":403,"explanation":412},"Why is a land breeze usually weaker than a sea breeze?",[408,409,410,411],"Because it blows at a higher altitude","Because the land-sea temperature difference is smaller at night than during the day","Because the sea is always calm at night","Because it only happens in winter","The land breeze is driven by a smaller temperature contrast, the modest night-time difference between the cooling land and the warmer sea, so it is generally weaker than the strongly heated daytime sea breeze.",{"q":414,"options":415,"answer":403,"explanation":420},"What can mark a sea-breeze front where it pushes inland?",[416,417,418,419],"A drop in the tide","A wind shift, a line of cumulus and sometimes triggered showers","A rise in atmospheric pressure everywhere","A total absence of wind","Where the cool marine air of a sea breeze meets warmer inland air, the sea-breeze front can form, often marked by a wind shift, a line of cumulus cloud and sometimes showers triggered by the lifting along it.",{"title":5,"description":372},[423,426,429,432],{"label":424,"url":425},"FAA Aviation Weather Handbook (FAA-H-8083-28)","https:\u002F\u002Fwww.faa.gov\u002Fregulationspolicies\u002Fhandbooksmanuals\u002Faviation\u002Ffaa-h-8083-28-aviation-weather-handbook",{"label":427,"url":428},"UK Met Office: sea breezes","https:\u002F\u002Fwww.metoffice.gov.uk\u002Fweather\u002Flearn-about\u002Fweather\u002Ftypes-of-weather\u002Fwind\u002Ftypes-of-wind",{"label":430,"url":431},"NOAA JetStream: the sea breeze and land breeze","https:\u002F\u002Fwww.noaa.gov\u002Fjetstream\u002Focean\u002Fsea-breeze",{"label":433,"url":434},"ICAO Doc 8896: Manual of Aeronautical Meteorological Practice","https:\u002F\u002Fstore.icao.int\u002Fen\u002Fmanual-of-aeronautical-meteorological-practice-doc-8896","learn\u002Fsea-and-land-breezes","Weather","j9AupHijLmaCO74GThqVXkQ1Y5KKudE_jrP9_fGApf8",{"related":439,"newer":456,"older":464,"series":371},[440,446,451],{"path":441,"title":442,"description":443,"date":444,"topic":436,"draft":373,"minutes":445,"series":371,"seriesOrder":371},"\u002Flearn\u002Ftemperature-inversions-and-stable-air","Temperature inversions and stable air","What a temperature inversion is, how it makes the air stable, and why that explains haze, fog, smooth rides, trapped pollution, low cloud and wind shear.","2026-06-12",4,{"path":447,"title":448,"description":449,"date":450,"topic":436,"draft":373,"minutes":445,"series":371,"seriesOrder":371},"\u002Flearn\u002Fmountain-waves-and-rotor","Mountain waves and rotor","How stable air over high ground sets up mountain waves and the violent rotor beneath, the cloud signs that reveal them, and why they deserve respect.","2026-06-09",{"path":452,"title":453,"description":454,"date":450,"topic":436,"draft":373,"minutes":455,"series":371,"seriesOrder":371},"\u002Flearn\u002Fpressure-systems-highs-and-lows","Pressure systems: highs, lows, ridges and troughs","What highs, lows, ridges and troughs are, the weather each brings, which way the wind circulates around them, and how to read them on a pressure chart.",7,{"path":457,"title":458,"description":459,"date":460,"topic":461,"draft":373,"minutes":445,"series":462,"seriesOrder":463},"\u002Flearn\u002Fstabilised-approaches-and-cdfa","Stabilised approaches and CDFA","Why a continuous descent final approach beats dive-and-drive, what a stabilised approach means, and where the 1000 ft and 500 ft gate heights come from.","2026-05-24","Operations","fly-an-instrument-approach",6,{"path":465,"title":466,"description":467,"date":468,"topic":469,"draft":373,"minutes":445,"series":371,"seriesOrder":371},"\u002Flearn\u002Fdecoding-the-icao-flight-plan","Decoding the ICAO flight plan","A field-by-field decode of the ICAO flight plan: Item 10 equipment and capabilities, Item 18 other information, and the codes that trip filers up.","2026-05-22","Briefing",1782839404346]