Heat Index
======================================

The Heat Index (HI) is defined as the temperature the human body perceives in shady conditions when perspiration is limited 
due to increased relative humidity. 

*thermofeel* computes the HI with two methods: Heat Index Simplified and Heat Index Adjusted.

More information:
* Blazejczyk, K., Epstein, Y., Jendritzky, G. et al. Comparison of UTCI to selected thermal indices. Int J Biometeorol 56, 515–535 (2012). https://doi.org/10.1007/s00484-011-0453-2
* NOAA/National Weather Service, Weather Prediction Center. The Heat Index Equation. https://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml

How To Use
------------------

**Simplified Heat Index**

You need 2m air temperature in Kelvin and relative humidity as a percentage.
Please use numpy arrays.

It returns the HI in Kelvin. 

.. code-block:: python

    calculate_heat_index_simplified(2m_temperature, relative_humidity_percent)

**Adjusted Heat Index**

You need 2m air temperature and 2m dew point temperature in Kelvin.
Please use numpy arrays.

It returns the HI in Kelvin. 

.. code-block:: python

    calculate_heat_index_adjusted(2m_temperature, 2m_dew_point_temperature)


Interpret the Output
----------------------
The HI is described in terms of danger of heat-related illnesses.

.. csv-table:: Heat Index Thresholds
    :file: heatindexthresholds.csv
    :header-rows: 1
    :class: longtable
    :widths: 1 1 1