Training Guide in Surface Weather Observations - Multiple Choices
Training Guide in Surface Weather Observations - Multiple Choices
Training Guide in Surface Weather Observations - Multiple Choices
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The altimeter sett<strong>in</strong>g shall be reported <strong>in</strong> <strong>in</strong>ches of mercury us<strong>in</strong>g four digits , e.g., A2992. The decimal<br />
is dropped. The altimeter sett<strong>in</strong>g is <strong>in</strong>cluded <strong>in</strong> all METAR and SPECI reports. THE ALTIMETER<br />
SETTING IS NEVER ESTIMATED. It shall be miss<strong>in</strong>g (not reported) if the read<strong>in</strong>g is questionable<br />
or the altimeters are out of service.<br />
Because of the large variety of <strong>in</strong>struments used <strong>in</strong> determ<strong>in</strong><strong>in</strong>g pressure data, their use will not be<br />
discussed here. You should study the applicable chapter <strong>in</strong> WSOH, and practice us<strong>in</strong>g the <strong>in</strong>struments<br />
at your station until you are thoroughly familiar with them.<br />
7.2 Station Elevation - HP<br />
The officially designated height above sea level to which station pressure perta<strong>in</strong>s. It is generally, but<br />
not always, the same as field elevation (H ) at an airport station.<br />
7.2.1 Station Pressure<br />
The atmospheric pressure at the designated station elevation.<br />
7.3 Sea-Level Pressure<br />
a<br />
The pressure value obta<strong>in</strong>ed by the theoretical reduction or <strong>in</strong>crease of barometric pressure to sea-level.<br />
Reported <strong>in</strong> hectopascals <strong>in</strong> the remarks section of a METAR report.<br />
Figure 7-2. Station Pressure Reduced to Sea Level.<br />
7-2