Chill and Heat Flashcards
1
Q
Wind Chill
A
ability of winds combined with low temperatures to cool via evaporation-transpiration of surface moisture (also conduction and convection)
2
Q
Feels like temperature
A
- 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
3
Q
JAG/TI formula
A
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)
4
Q
JAG/TI limitations
A
very low winds speeds cause reverse wind chill
wind chill around 28C causes issues.
5
Q
WBGT combines 3 measurements
A
- dry bulb
- exposed wet bulb temperature
- black globe temperature
0.7W + 0.2G + 0.1D
