What does SPECI mean in METAR?
special (unscheduled) report
TYPE OF REPORT METAR: hourly (scheduled) report; SPECI: special (unscheduled) report.
What is the difference between a regular METAR report and a SPECI?
A METAR is a routine report of meteorological conditions at an aerodrome. A SPECI is a special report of meteorological conditions, issued when one or more elements meet specified criteria significant to aviation.
How can you tell if a METAR and SPECI report is a corrected report?
6 . How can you tell if a METAR or SPECI report is a corrected report? This information is provided in plain language in the remarks section of the report. The report begins with CORRECTED followed with METAR or SPECI depending on the report.
What causes a SPECI?
A SPECI is issued when there has been a significant change from the METAR occurs. Significant changes include changes to wind direction, visibility, weather phenomena, ceiling, an aircraft mishap has occurred or there is safety critical meteorological situation.
How often are SPECI issued?
Special Reports (SPECI) are Aerodrome Weather Reports issued whenever weather conditions fluctuate about or are below specified criteria. These criteria are published in the Aeronautical Services Handbook: Chapter 6, Table 6.1 and 6.2.
At what times may a SPECI METAR be issued?
METAR is a surface weather observation issued on the hour, while SPECI is a special observation, issued at times other than on the hour, as the result of a significant weather change.
How long does a SPECI last?
A SPECI has no validity period because it is a report. It “expires” as soon as it is issued since it is simply a statement of the conditions at the time the report was made. TTFs are “mini-forecasts”, highly accurate and valid only for 3 hours from the time of the report to which they are attached.
How long is a SPECI valid for?
What does NSC mean in METAR?
When there are no clouds of operational significance to report, no CB or TCU and CAVOK is not appropriate, the abbreviation NSC (No Significant Cloud) is used.
What is the difference between CAVOK and NSC?
NSC (No Significant Cloud) is used when there are no “clouds of operational significance” to report – no CB or TCU, but CAVOK is not appropriate (either ceiling, visibility or any significant weather not meeting CAVOK requirement).