About

The Weather Forecast Checker is a high-precision meteorological instrument designed to go beyond basic temperature readings. By aggregating data from global atmospheric models, it provides a multidimensional view of environmental conditions. This tool calculates derived metrics such as the Heat Index and Dew Point, which are critical for assessing human physiological comfort and safety.

Utilizing the Open-Meteo geospatial database, this dashboard processes raw telemetry including Relative Humidity (RH), Barometric Pressure (P), and Solar Irradiance. The integrated Lifestyle Engine applies conditional logic to these variables to score outdoor suitability for specific activities, mitigating risks associated with extreme weather events.

Formulas

The dashboard utilizes industry-standard thermodynamic equations to derive human-centric metrics from raw sensor data.

Dew Point Approximation

The temperature at which air becomes saturated with water vapor.

T dp \approx T - 100 - RH 5

T = Temperature (°C), RH = Relative Humidity (%)

Wind Chill Index (SI)

Quantifies the rate of heat loss from exposed skin caused by wind and cold.

T wc = 13.12 + 0.6215 T - 11.37 v 0.16 + 0.3965 T v 0.16

v = Wind Speed (km/h)

Solar Elevation (Approximation)

Used to determine the Golden Hour.

sin (α) = sin (δ) sin (φ) + cos (δ) cos (φ) cos (H)

α = Elevation, δ = Declination, φ = Latitude, H = Hour Angle

Reference Data

WMO Code	Classification	Precipitation (mm/h)	Visibility (km)	Advice
0	Clear sky	0.0	> 20	Perfect visibility. High UV risk.
1, 2, 3	Mainly clear / Partly cloudy	0.0	10 - 20	Standard conditions.
45, 48	Fog / Depositing rime fog	0.0	< 1	Hazardous driving conditions.
51, 53, 55	Drizzle (Light, Mod, Dense)	< 0.5	2 - 5	Roads may be slick.
61, 63, 65	Rain (Slight, Mod, Heavy)	0.5 - 4.0+	2 - 8	Umbrella required. Hydroplane risk.
71, 73, 75	Snow fall (Slight, Mod, Heavy)	N/A	< 1	Accumulation likely.
95, 96, 99	Thunderstorm / Hail	Variable	Variable	Seek shelter immediately.

Frequently Asked Questions

The "Feels Like" metric accounts for thermodynamics affecting the human body. In cold conditions, wind strips away the thermal boundary layer of the skin (Wind Chill). In hot conditions, high humidity prevents sweat evaporation, reducing the body's ability to cool itself (Heat Index). We use the Rothfusz regression for heat and the OSG formula for cold.

The score (0-10) is a composite index based on weighted variables. For "Running", we penalize temperatures > 25°C, humidity > 70%, and precipitation probability > 30%. For "Stargazing", we penalize cloud cover > 20% and moon illumination > 50%. This is computed client-side using the retrieved hourly forecast data.

The Golden Hour is defined geometrically when the sun's elevation angle is between -4° and 6°. This period offers soft, diffused light ideal for photography due to the longer path sunlight takes through the atmosphere, scattering blue light and leaving red/orange hues.

Yes. The current pressure is displayed in hPa (Hectopascals). A rapidly falling pressure (> 1 hPa/hour) typically indicates an approaching storm system or low-pressure front, while rising pressure suggests clearing skies.