Automated station with precip discriminator; Sea Level Pressure: 1013.1 hPa; Exact Temp: 22.2°C, Dew: 16.1°C
⚓ Runway Crosswind & Density Altitude
Runway OrientationRunway 22 (220°)
Wind Angle Difference20° Right
Headwind Component14 kt Headwind
Crosswind Component5 kt (Gust: 8 kt)
Pressure Altitude13 ft MSL
Density Altitude830 ft MSL
2204
🕑 Terminal Aerodrome Forecast (TAF) Periods
Base Period09/12:00Z to 10/18:00Z
Wind 240° at 14 knots gusting 22 knots, visibility greater than 6 statute miles, broken clouds at 4,000 ft, overcast at 8,000 ft.
FROM 09/18:00ZContinuing through forecast end
Wind shifting to 260° at 12 knots, visibility greater than 6 miles, scattered clouds at 6,000 ft.
Understanding Aviation Flight Categories
The Federal Aviation Administration (FAA) and National Weather Service categorize aerodrome meteorological conditions into four flight categories. These determine required pilot ratings, flight plan filings, and minimum fuel reserves:
Category
Ceiling (AGL)
Visibility
Operating Rules
VFR
Greater than 3,000 ft
Greater than 5 statute miles
Visual Flight Rules; visual separation permitted
MVFR
1,000 to 3,000 ft
3 to 5 statute miles
Marginal VFR; caution recommended for student pilots
IFR
500 to under 1,000 ft
1 to under 3 statute miles
Instrument Flight Rules; ATC clearance required
LIFR
Less than 500 ft
Less than 1 statute mile
Low IFR; precision approaches and low minimums apply
Type & Station: Four-letter ICAO station indicator (e.g., KJFK or EGLL).
Date & Zulu Time: Six digits followed by 'Z' (e.g., 091451Z is the 9th day of the month at 14:51 UTC).
Wind: 3-digit true heading and speed in knots (e.g., 24015G23KT indicates 240 degrees at 15 knots with 23-knot gusts).
Visibility: In statute miles followed by 'SM' (e.g., 10SM or 1/2SM).
Weather Phenom: Contractions like TSRA (thunderstorm with rain), BR (mist), or FG (fog).
Sky Condition: Layer coverage and altitude in hundreds of feet (e.g., BKN045 = Broken at 4,500 ft).
Temperature & Dew Point: In Celsius separated by a slash (e.g., 22/16; sub-zero prefixed with 'M' like M02/M08).
Altimeter: Prefix 'A' followed by inches of mercury in hundredths (e.g., A2992 = 29.92 inHg). European reports use 'Q' and hectopascals (e.g., Q1013).
Density Altitude & Aircraft Takeoff Performance
Density Altitude is pressure altitude corrected for non-standard temperature. High density altitude significantly degrades aircraft performance by reducing aerodynamic lift over the wings, decreasing propeller efficiency, and diminishing engine power output. In hot, high-elevation conditions, a plane requires significantly longer takeoff ground rolls and exhibits reduced climb gradients.
Frequently Asked Questions
What is the difference between a METAR and a TAF?
A METAR is an observation of actual current surface weather conditions at an airport, recorded once every hour or as a special SPECI. A TAF is a terminal aerodrome forecast predicting expected meteorological conditions over a 24- to 30-hour window.
What determines a cloud "ceiling"?
By aviation definition, a ceiling is the height above ground level (AGL) of the lowest layer of clouds reported as either Broken (BKN, 5/8 to 7/8 coverage) or Overcast (OVC, 8/8 coverage). Few (FEW) and Scattered (SCT) do not constitute a ceiling.
Why does this tool compute runway crosswind?
Every aircraft has a published maximum demonstrated crosswind velocity. If the crosswind component exceeds pilot personal minimums or manufacturer recommendations, landing on that specific runway may be hazardous or prohibited.
Aviation weather reports use dense alphanumeric shorthand (METAR and TAF) that can be difficult for student pilots, flight sim enthusiasts, and general aviation pilots to interpret quickly under pressure. This tool provides immediate plain-English translation, density altitude calculations, and runway crosswind component checks completely client-side without delays or paywalls.
When to use it
Use this tool during pre-flight planning review, flight simulation sessions (MSFS, X-Plane), pilot ground school study, or whenever you need to check surface winds, runway components, and visual flight rules minimums at any airport.
Common questions
What is the difference between VFR, MVFR, IFR, and LIFR?
Visual Flight Rules (VFR) requires ceiling greater than 3,000 feet AGL and visibility greater than 5 statute miles. Marginal VFR (MVFR) indicates ceiling 1,000 to 3,000 feet or visibility 3 to 5 miles. Instrument Flight Rules (IFR) is ceiling 500 to under 1,000 feet or visibility 1 to under 3 miles. Low IFR (LIFR) means ceiling below 500 feet or visibility under 1 mile.
How are crosswind and headwind components calculated?
The tool computes the angular difference between wind direction and runway heading: Headwind = Wind Speed × cos(Angle), and Crosswind = Wind Speed × sin(Angle). This helps pilots evaluate aircraft maximum demonstrated crosswind limits.
Is this tool suitable for official FAA pre-flight briefings?
No. This tool is designed exclusively for flight simulation, educational study, and quick informational reference. Official pilot weather briefings must be obtained through FAA-approved sources such as 1800wxbrief.com or aviationweather.gov.
Does this tool work completely offline?
Yes. All METAR and TAF parsing algorithms, airport coordinate databases, crosswind trigonometry, and density altitude calculations execute 100% in your local browser without external network requests.