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Air traffic controllers seem to broadcast this information, is anyone able to tell me what this is or what its use is for?

LTBA 162120Z 03008KT 360V080 9999 BKN035 06/02 Q1028 NOSIG

Especially the last part, what does NOSIG mean?

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  • $\begingroup$ NOSIG means no significant change since the last update. The information is called a METAR. $\endgroup$ – Ron Beyer Mar 16 '16 at 21:39
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This is a METAR, a weather report. From the Wikipedia article:

METAR is a format for reporting weather information. A METAR weather report is predominantly used by pilots in fulfillment of a part of a pre-flight weather briefing, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.

The meaning of this METAR is:

Location: LTBA
Day of month: 16
Time: 21:20 UTC
Wind:  True direction = 030 degrees, Speed: 8 knots
Wind direction is variable between 360 and 080
Visibility: 10 km or more
Clouds: Broken sky , at 3500 feet above aerodrome level
Temperature: 06 degrees Celsius
Dewpoint: 02 degrees Celsius
QNH (Sea-level pressure): 1028 hPa
No significant changes expected in the near future

NOSIG means: No significant changes expected in the near future.

See this METAR-TAF decoder.

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