Vaisala AWS330 User Manual

User's Guide ______________________________________________________________________
274 _________________________________________________________________ M211296EN-A
Heat Index
The heat index measures how hot it feels when the effect of humidity is
added to high temperature. This calculation uses two source values,
temperature and humidity, and produces one result value, the heat index.
The calculation formula is as follows:
HI = 16.923 +
0.185212 * TA +
5.379410 * RH –
0.100254 * TA*RH +
9.41695*10
-3
* TA
2
+
7.28898*10
-3
* RH
2
+
3.45372*10
-4
* TA
2
*RH –
8.14971*10
-4
* TA*RH
2
+
1.02102*10
-5
* TA
2
*RH
2
–
3.86460*10
-5
* TA
3
+
2.91583*10
-5
* RH
3
+
1.42721*10
-6
* TA
3
*RH +
1.97483*10
-7
* TA*RH
3
–
2.18429*10
-8
* TA
3
*RH
2
+
8.43296*10
-10
* TA
2
*RH
3
–
4.81975*10
-11
* TA
3
*RH
3
where
RH = Relative humidity [%]
TA =
Air temperature [F]
HI =
Heat index [F]
Table 111 Inputs for Heat Index Calculation
Input Variable
Air temperature (TA) TAAVG1M; see Table 4 on page 22
(1
Relative humidity (RH) RHAVG1M; see Table 4 on page 22
1)
Converted internally to degrees Fahrenheit.

Vaisala AWS330 Specifications

General

Brand	Vaisala
Model	AWS330
Category	Weather Station
Language	English