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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If any type of fog, <strong>in</strong>clud<strong>in</strong>g mist, is observed, the follow<strong>in</strong>g flow chart can be used as an aid <strong>in</strong> determ<strong>in</strong><strong>in</strong>g<br />
and report<strong>in</strong>g the various types of fog.<br />
With<strong>in</strong><br />
10 Miles?<br />
<br />
YES<br />
<br />
With<strong>in</strong><br />
5 Miles?<br />
<br />
YES<br />
<br />
6 Feet Deep<br />
or More?<br />
<br />
YES<br />
<br />
Fairly Uniform<br />
<strong>in</strong> All<br />
Directions?<br />
<br />
YES<br />
<br />
NO<br />
If “FOG” is Visible<br />
Report <strong>in</strong><br />
Remarks, e.g.,<br />
FG BNK<br />
DSNT E-S<br />
NO VCFG 1<br />
NO MIFG 1<br />
NO<br />
Visibility Less<br />
Than 7 Miles? YES<br />
<br />
NO<br />
<br />
Is <strong>in</strong> a<br />
Cont<strong>in</strong>uous<br />
Mass?<br />
Visibility Less<br />
Than 5/8<br />
Mile?<br />
<br />
NO<br />
<br />
NO BCFG 1<br />
YES PRFG 1<br />
YES<br />
4-7<br />
Temperature<br />
Below<br />
Freez<strong>in</strong>g?<br />
(0.1°C or less)<br />
<br />
NO<br />
<br />
No Report BR FG<br />
1 - Should be further described <strong>in</strong> Remarks, e.g., VCFG W-N, MIFG NW-E,<br />
BCFG S AND W, PRFG OVR RWY 18. MIFG, PRFG, and BCFG may be<br />
reported if the prevail<strong>in</strong>g visibility is 7 statute miles or greater.<br />
4.2 Cod<strong>in</strong>g of Present <strong>Weather</strong> Group(s)<br />
YES FZFG<br />
No more than three weather groups shall be used to report weather phenomena at or near the station. If more<br />
than one significant weather phenomenon is observed, separate weather phenomenon groups shall be<br />
<strong>in</strong>cluded <strong>in</strong> the report. Precipitation is always reported before obscurations. If more than one form of<br />
precipitation is observed, the appropriate abbreviations are comb<strong>in</strong>ed <strong>in</strong> a s<strong>in</strong>gle group with the dom<strong>in</strong>ant<br />
type of precipitation reported first. In such a s<strong>in</strong>gle group, the <strong>in</strong>tensity refers to the first precipitation type.<br />
The precipitation that follows will be of equal or lesser <strong>in</strong>tensity.<br />
Example: RASN FG HZ<br />
The same is true if there is more than one type of obscuration. They are entered <strong>in</strong> the order of dom<strong>in</strong>ance.<br />
An obscuration that is coded with another present weather group(s) is separated from it by a space.<br />
Examples: 3/4SM TSRA BR 1/4SM TS VCSH FG 3SM FU HZ