Chill and Heat

Question 1

Wind Chill

Answer 1

ability of winds combined with low temperatures to cool via evaporation-transpiration of surface moisture (also conduction and convection)

Question 2

Feels like temperature

Answer 2

• corrects anemometer to face level.
• assumes skin is dry.
• it is an index so technically should not have a degree sign.
• calculated using JAG/TI method.
• Assumes no impact from sun e.g. clear sky
• No humidity data used

Question 3

JAG/TI formula

Answer 3

Wind chill = 13.1 + (0.6 x Air temp) - (11.4 x (V^0.16)) + (0.4 x Air temp x (V^0.16))

where V = wind speed at 10m (kph)

Question 4

JAG/TI limitations

Answer 4

very low winds speeds cause reverse wind chill

wind chill around 28C causes issues.

Question 5

WBGT combines 3 measurements

Answer 5

• dry bulb
• exposed wet bulb temperature
• black globe temperature

0.7W + 0.2G + 0.1D