26.07.2013 Views

Training Guide in Surface Weather Observations - Multiple Choices

Training Guide in Surface Weather Observations - Multiple Choices

Training Guide in Surface Weather Observations - Multiple Choices

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

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

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!