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🌤 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 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 almanacAtmosphere & 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 labCockpit & Procedures
🛫 Procedure Explorer
Overlay any US SID, STAR or instrument approach on the sectional, TAC or IFR chart. Pick transitions one at a time, animate the flow, see the altitudes in 3D, read the leg-by-leg table, and pull up the official FAA plate — including charts the CIFP never codes.
Open the explorer🛡 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 explainerStudy & 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