1. What is Cloud Base Height?

Cloud Base Height (CB) is the altitude of the lowest visible part of a cloud above ground level. It's an important parameter for aviation, weather forecasting, and outdoor activities.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( T \) — Air temperature in °C
• \( Td \) — Dew point temperature in °C
• 125 — Empirical constant (meters per °C)

Explanation: The formula estimates cloud base by calculating how much the air must rise and cool for condensation to occur, based on the temperature-dew point spread.

3. Importance of Cloud Base Calculation

Details: Knowing cloud base height is crucial for flight planning, determining ceiling for visual flight rules, and predicting fog or low cloud conditions.

4. Using the Calculator

Tips: Enter temperature and dew point in °C. Both values should be measured at the same altitude (typically surface level). The difference (T - Td) is called the "spread."

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this formula?
A: It provides a reasonable estimate but actual cloud base may vary due to local conditions, humidity, and atmospheric stability.

Q2: What are typical cloud base heights?
A: Varies widely - from ground level (fog) to 500-2000m for fair weather cumulus, higher for other cloud types.

Q3: When is this formula most accurate?
A: Best for cumuliform clouds in unstable air masses. Less accurate for stratiform clouds or inversion conditions.

Q4: Why is the constant 125?
A: It represents the approximate rate at which rising air cools (1°C per 100m) combined with typical moisture characteristics.

Q5: Can I use Fahrenheit values?
A: No, the formula requires Celsius. Convert Fahrenheit to Celsius first: °C = (°F - 32) × 5/9.