Weather
🌬 KANP Weather Hub
The live go/no-go picture for Lee Airport — wind compass and runway crosswind analysis, hour-by-hour flight-window scoring, METARs from the nearby fields, KMTN/KBWI/KDCA TAFs decoded, and radar.
Open the hub🌀 DC Forecast Discussion
The NWS forecast discussion for the DC area, decoded — a live map of the air masses, fronts and pressure systems driving the forecast, plus a change log showing how the forecasters' reasoning evolved between issuances.
Open the discussion🌡 Skew-T Explorer
Forecast soundings for any US airport on an interactive Skew-T log-p diagram, plus real SPC balloon soundings with explain-on-hover — CAPE, cloud bases, freezing level, and how balloon data becomes the forecast.
Open the explorer🧊 The Air Above
The forecast as a rotatable 3-D block of sky over the Chesapeake — every cloud deck at its modeled altitude, winds aloft as level-by-level arrows or an animated three-dimensional flow, the freezing surface tilting with the air mass, rain columns, and live radar draped on the ground. Spin it, then slide through the next two days.
Spin the sky📚 Weather Almanac
The site's own weather archive, explorable — a calendar of every archived day colored by flight category, the METARs, TAFs, alerts and forecast discussions behind it, how each day's forecast drifted before it verified, and season-long temperature trends.
Open the almanac🗺 Surface Analysis
WPC's fronts, troughs, highs and lows drawn from the coded bulletin on a dark map, every 3 hours — scrub through months of archived analyses, trails of the last 12 h, low tracks, station plots at zoom, a KNAK barograph, and the nearest front to KANP with its motion.
Open the analysis🎯 Forecast Verification
GFS/NAM MOS, TAFs and the NWS grid vs METAR — flight category, IFR, wind, temperature, PoP, by lead time.
Open the scorecardAtmosphere & Performance
🎈 Air Lab
Interactive simulations of density altitude, true airspeed, ground speed and atmospheric stability — pull the levers and watch the performance numbers move.
Open the lab🌀 Pressure Systems
Highs and lows you can drag, and the wind between them from pressure gradient, Coriolis and friction — set latitude and surface friction, drop air parcels from rest, then spin the same field in 3-D to see inflow, rising air and outflow aloft.
Open the systems⛈ Thunderstorm Lab
A live cloud model: edit the sounding, light a warm bubble and watch the updraft, hail, cold pool and anvil form — charge separates on graupel–ice collisions, leaders find the ground, thunder arrives at the speed of sound. A molecule-scale microscope follows any point in the storm.
Open the lab🌬 Wind Tunnel
A flow solver running live in the browser around a wing you can pitch, camber, thicken and flap — smoke rakes, the pressure field, lift and drag as they happen, Cp along the chord, the separation point walking forward, the buffet at stall, and a sweep that plots the lift curve.
Open the tunnelCockpit & Procedures
🛫 Procedure Explorer
Every coded US SID, STAR and instrument approach. Draw one on the sectional, TAC or IFR chart with its altitudes in 3D, the leg table and the FAA plate; query and rank all 16,000 nationwide by kind, state, descent angle, climb gradient and leg types; and see what each AIRAC cycle added, withdrew and changed, leg by leg.
Open the explorer📋 NOTAM Hub
Every active NOTAM in the country, archived hourly and counted — by keyword, state, facility and age; runway closures, TFRs, GPS interference and permanent NOTAMs; what came in and what left today; and any facility's list on demand.
Open the hubStudy & Reference
🧭 Aviation Knowledge Map
An expandable concept graph of the whole airplane knowledge web — aerodynamics, systems, weather, navigation, airspace, regs and more — with the cross-links between them. Browse it as a graph or a readable outline, and tick off the concepts you can teach.
Open the map✈ Aircraft Compare
The master spec table for any airplane — 81 measurements per type, side by side, with the ratios worked out and every silhouette generated from the numbers and drawn to one scale. CRJ against ERJ against 777, or a Skyhawk against a 777-9.
Open the table📡 US NAS Radar
Every FAA terminal and en route surveillance radar, the 45 TDWRs and the WSR-88D network on one map with nominal range rings, filters by kind, a site table, and the radars whose range reaches KANP.
Open the mapUnfinished projects
🌤 METAR Sky
The current METAR drawn as a living scene — sun and moon where they really are, cloud decks at their reported bases, rain, snow, fog and lightning, a windsock flying the actual wind. Decode the raw report group by group, preview TAF periods, or paste any METAR and watch it painted.
Open the sky🛡 The DC SFRA
Washington's Special Flight Rules Area, explained from inside the ring — the SFRA, FRZ and prohibited areas drawn to scale on a click-anywhere map, the rules in plain English, and a decision tree that walks any flight to its exact procedure.
Open the explainer