Revision 6 Feb/2009
A-5
KMD 550/850 FIS Addendum
Appendix A
Understanding Weather Reports
5. Forecast Wind: 22020KT
See #5 in the UNDERSTANDING METARs section for details.
6. Forecast Visibility: 3SM
See #6 in the UNDERSTANDING METARs section for details,
except RVR is not included in a TAF
7. Forecast Weather Phenomenon: -SHRA
See #7 in the UNDERSTANDING METARs section for details.
8. Sky Conditions: BKN020
See #8 in the UNDERSTANDING METARs section for details.
9. Beginning of Changed Forecast Conditions: FM1000
FM denotes “from” and 1000 indicates 1000Z. “From” means a sig-
nificant change in prevailing conditions is expected. The described
conditions follow this element and supercede all previous forecast
conditions.
10. Forecast Wind: 22010KT
See #5 in the UNDERSTANDING METARs section for details.
11. Forecast Visibility: 5SM
See #6 in the UNDERSTANDING METARs section for details.
12. Forecast Weather Phenomenon: -SHRA
See #7 in the UNDERSTANDING METARs section for details.
13. Forecast Sky Conditions: OVC020
See #8 in the UNDERSTANDING METARs section for details.
14. Change in Conditions: BECMG 1315
BECMG indicates “becoming” over the time interval between 1300Z
(13) and 1500Z (15). “Becoming” describes a gradual change in
forecast conditions. The described conditions follow this element
and supercede previously reported like elements.
15. Wind Becoming: 20010KT
See #5 in the UNDERSTANDING METARs section for details. This
element may be omitted if no change is expected.
16. Visibility Becoming: P6SM
See #6 in the UNDERSTANDING METARs section for details. This
element may be omitted if no change is expected.
17. Weather Phenomenon Becoming: NSW
NSW indicates “No Significant Weather”. See #7 in the UNDER-
STANDING METARs section for details.
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