[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-669372-105":59,"doc-detail-669372-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","weather-charts-current-weather-products-observations-forecast-charts","Weather Charts - Current Weather Products - Observations & Forecast Charts","","Weather Charts summarizes current weather products used for aviation planning and short-term decision-making. It explains observations tools including surface analysis charts and constant pressure charts, detailing what each chart depicts (sea level pressure, fronts, winds, temperatures, dew points, sky cover, and tropical waves). It covers forecast chart types, issuance timing, validity windows, and how to read key symbols such as high/low centers, pressure trends, and front movement indicators, plus altitude-to-mb context for 3D interpretation.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/weather-charts-current-weather-products-observations-forecast-charts/669372/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/weather-charts-current-weather-products-observations-forecast-charts/669372.png","ImageObject",300,407,{"name":92,"@type":93},"CatatanPagi","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-02","2026-11-01",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the main purpose of surface analysis charts for users?","Question",{"text":112,"@type":113},"Surface analysis charts show the overall “big picture” to help plan flights around weather (WX) by depicting sea level pressure, highs/lows, ridges/troughs, fronts, boundaries, and an overview of winds, temperatures, and dew points.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How often are surface analysis charts issued, and how long are they valid?",{"text":117,"@type":113},"Surface analysis charts are issued every 3 hours and are valid for 6 hours.",{"name":119,"@type":110,"acceptedAnswer":120},"What do constant pressure charts add beyond surface analysis charts?",{"text":121,"@type":113},"Constant pressure charts provide a 3D view at different pressure levels using balloon-gathered data, showing winds and temperatures and helping identify risks such as jetstream or freezing conditions.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},669372,1793550691,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},962090894170,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","Weather Charts  \nCurrent Weather Products  \n• Observations  \n– Surface Analysis Charts  \n– Constant Pressure Charts  \n– Weather Depiction Charts  \n– Lifted Index Charts  \n– Radar Summary Charts  \n• Forecast Charts  \n– Short Range Surface Prognostic Chart  \n– Low level Significant Weather Prognostic Chart  \n2  \nSurface Analysis Chart  \n• Shows the “big picture” – helps plan flights around WX  \n• Depicts  \n– Sea level pressure  \n– Position of highs, lows, ridges and troughs  \n– Position of fronts  \n– Position of boundaries  \n– Overview of winds, temperatures and dew points  \n• Issued every 3 hours  \n• Valid for 6 hours  \n• Available at: [http://www.hpc.ncep.noaa.gov/html/sfc2.shtml](http://www.hpc.ncep.noaa.gov/html/sfc2.shtml)  \n3  \nSurface Analysis Chart  \nCold front – Pips show direction of movement  \nWarm front  \nstationary front  \nData  \nHigh -Number adjacent is central pressure  \nLow  \nSea Level Pressure  \n–4mb interval lines  \n-Line below \\# is pressure trend  \nTemp  \nDew Point  \nWind  \nSea Level pressure (first 10 or 9 digits omitted) or ceiling height  \nSky cover – If station symbol is square then automated data was used  \nTropical wave  \n4  \nSurface Analysis Chart  \n5  \nSurface Analysis Chart  \n6  \nSurface Analysis Chart  \n7  \nSurface Analysis Chart  \n8  \nConstant Pressure Charts  \n• Similar to the surface analysis chart but at different pressure levels (altitudes will vary)  \n– 850 MB chart ≈ 5,000’  \n– 700 MB chart ≈ 10,000’  \n– 500 MB chart ≈ 18,000’  \n• Provides a 3D view of large areas – interpolate between charts  \n• Data gathered through balloons  \n• Shows winds and temps – can identify jetstream / freezing risks for example  \n• Charts available at: [http://aviationweather.gov/std_brief/](http://aviationweather.gov/std_brief/)  \n9  \nConstant Pressure Charts  \nIssue date/ time  \nX Marks high/low center  \nWind  \nLevel   \nSome charts also show:  \nisotherms – areas of equal temperature – bold dashed line  \nisotachs – constant wind speed areas – short fine dashed line with   K  \nContour line area of = height in meters (850 MB omits 1 before and 700 omits 2 or 3 before – which ever makes the number closer to  \n3,000 meters) e.g. 309 = 3309 meters or 10,754’ – Look at gradients -wind speed proportional to gradients (close = high winds) . Contours can be interpreted in the same manner as isobars on the surface chart (e.g. high altitude=high pressure area)  \n10","cbCainn6WqYoxFNz","https://ap.wps.com/l/cbCainn6WqYoxFNz","pdf",5750714,41,"English","# Weather Charts\n## Current Weather Products\n### Observations\n### Forecast Charts\n# Surface Analysis Chart\n## Key elements and interpretation\n# Constant Pressure Charts\n## Altitude mapping and guidance","[{\"question\":\"What is the main purpose of surface analysis charts for users?\",\"answer\":\"Surface analysis charts show the overall “big picture” to help plan flights around weather (WX) by depicting sea level pressure, highs/lows, ridges/troughs, fronts, boundaries, and an overview of winds, temperatures, and dew points.\"},{\"question\":\"How often are surface analysis charts issued, and how long are they valid?\",\"answer\":\"Surface analysis charts are issued every 3 hours and are valid for 6 hours.\"},{\"question\":\"What do constant pressure charts add beyond surface analysis charts?\",\"answer\":\"Constant pressure charts provide a 3D view at different pressure levels using balloon-gathered data, showing winds and temperatures and helping identify risks such as jetstream or freezing conditions.\"}]","Weather Charts - Current Weather Products - Observations & Forecast Charts | PDF",103]