Met Obs : Pressure

Front 1

The weight of the overlying column of air per unit area extending up to the outer limit of atmosphere

Back 1

Atmospheric Pressure

Front 2

Obtained when station pressure is reduced by applying the altitude correction established for the station

Back 2

Mean Sea-Level Pressure

Front 3

A ___ is a simple instrument for measuring atmospheric pressure

Back 3

Barometer

Front 4

Reading the mercurial barometer and/or microbarograph/barograph shall be the ____ element of the indoor observations.

Back 4

Last

Front 5

The established elevation is the same elevation above mean sea level of the _____ in the cistern of the mercurial barometer installed in the station

Back 5

Ivory Point/Fiducial Point

Front 6

1 atm = ____ hPa

*1 atm = ___ inHg; cmHg; mmHg

**1 hPa = _____ dynes/cm

Back 6

1013.25 hPa

*29.92; 76; 760

**1000 dynes/cm

Front 7

3 corrections applied to barometer readings made at dofferent times and different places

Back 7

1. Index Correction Error

2. Gravity Correction Error

3. Temperature Correction Error

Front 8

*____ is that elevation at or above mean sea level, to which all pressure observations are reduced

Back 8

Established elevation of the station

Front 9

*Standard Temperature to which barometer readings reduced

Back 9

0 degree Celcius

Front 10

*Observer check ________________. This is listed in a correction card attached to the instrument specifying the correction to be applied for ___.

Back 10

Certificates of comparison with standard;

Index error

Front 11

*Philippnes gravity corrections has

Back 11

Negative (-) values

Front 12

*The characteristics of ______ are the nature of the pressure-change in the 3 hours preceding the observation. It shall be determined by a study of _______

Back 12

Pressure Tendency;

Barograph; microbarograph

Front 13

How to read psychrometer

Step A

Back 13

Moisten wick or muslin cloth wrapped around wet-bulb thermometer with distilled water.

If a wick and water container are used to keep wet-bulb covering moist, the container should be placed to the side of the thermometer and with mouth slightly lower or at the same level as the bulb

Front 14

How to read psychrometerStep B (Whirling Type)

Back 14

Rotate instrument to see if wet bulb reading has levelled off to its lowest reading

Front 15

How to read psychrometerStep B (Assman Type)

Back 15

Start ventilating fan, making sure that the wet-bulb is receiving sufficient water supply

Front 16

How to read psychrometerStep B (Sling Type)

Back 16

the observer should stand in a shaded area, facing the wind before whirling the psychrometer. The whirling should be stopped smoothly and the reading taken rapidly.

Front 17

How to read psychrometerStep C

Back 17

After the lowest wet-bulb reading has been attained, read dry bulb thermometer. Record both readings.

Front 18

Procedures sling psychrometer

Back 18

a. Clip the elbow (of the arm holding the psychrometer) firmly to the side of the bodyb. Whirl gently at a rate 2 - 4 rev/s to attain the desired ventilation to surface wind ranging from 2.5 to 10 mps.