## Saturday, May 25, 2024

### How to calculate feels like temperature

Let’s consider a wind speed of 11km/hr., actual temperature of 30 degrees C, and humidity of 79%. Now we calculate feels like temperature as follows:

Feels Like Temperature Calculation

# Feels Like Temperature Calculation

To calculate the "feels like" temperature, we can use the Heat Index formula. The Heat Index (HI) is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. The formula for calculating the Heat Index (HI) is:

HI = c1 + c2T + c3R + c4TR + c5T2 + c6R2 + c7T2R + c8TR2 + c9T2R2

Where:

• T is the temperature in degrees Fahrenheit.
• R is the relative humidity as a percentage.
• The constants are:
• c1 = -42.379
• c2 = 2.04901523
• c3 = 10.14333127
• c4 = -0.22475541
• c5 = -6.83783 × 10-3
• c6 = -5.481717 × 10-2
• c7 = 1.22874 × 10-3
• c8 = 8.5282 × 10-4
• c9 = -1.99 × 10-6

First, we need to convert the temperature from Celsius to Fahrenheit:

T(°F) = T(°C) × (9/5) + 32

T(°F) = 30 × (9/5) + 32

T(°F) = 86

Next, we can plug the values into the Heat Index formula:

HI = -42.379 + 2.04901523 × 86 + 10.14333127 × 79 + (-0.22475541 × 86 × 79)
+ (-0.00683783 × 862) + (-0.05481717 × 792)
+ (0.00122874 × 862 × 79) + (0.00085282 × 86 × 792)
+ (-0.00000199 × 862 × 792)

HI ≈ 99.3

Converting this back to Celsius:

HI(°C) = (99.3 - 32) × (5/9) ≈ 37.4

So, the "feels like" temperature is about 37.4°C.

## Calculations Summary:

1. Convert temperature from Celsius to Fahrenheit:
2. T(°F) = 30 × (9/5) + 32 = 86

3. Plug values into the Heat Index formula:
4. HI = -42.379 + 2.04901523 × 86 + 10.14333127 × 79 + (-0.22475541 × 86 × 79)
+ (-0.00683783 × 862) + (-0.05481717 × 792)
+ (0.00122874 × 862 × 79) + (0.00085282 × 86 × 792)
+ (-0.00000199 × 862 × 792)

HI ≈ 99.3

5. Convert Heat Index back to Celsius:
6. HI(°C) = (99.3 - 32) × (5/9) ≈ 37.4

Therefore, the "feels like" temperature is 37.4°C.

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### Difference between wind speed and wind gusts in weather

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