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20 Cards in this Set
- Front
- Back
Metar report |
Aviation routine weather reports Observation taken 55-59 min. |
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SPECI |
Unscheduled observation when a pre defined condition criteria changes to an original Metar report |
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Auto |
Refers to an observation taken from an unattended automated surface observation system (ASOS). |
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AO1 |
Is an ASOS without a rain vs Snow discriminator |
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AO2 |
Is AN ASOS WITH a rain vs Snow discriminator |
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COR |
Is an observation corrected for an error. Disregard the previous transmission. |
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Wind direction |
Reported wind direction and magnetic north. Reported in knots and true Direction |
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Prevailing winds (sustained) |
Is the average Direction / speed over the 2 minutes CONUS 10 minutes OCONUS notice immediately preceding the observation. |
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Gusts |
Are a sudden brief increase in speed with a variation of 10 knots or more between Peaks and lulls. 10 minutes immediately preceding observation. |
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Squall |
A very large variation of wind speed. Used when wind speed increases by at least 16 knots and is sustained at 22 knots or more for at least 1 minute. |
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Wind variability |
Is reported if the direction varies by 60 degrees and speeds greater than 6 knots. Separated by a V. |
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Prevailing visibility |
Is the greatest horizontal visibility observed throughout at least half the Horizon Circle and is not necessarily continuous. |
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Sector visibility |
Reported in the remarks section if it differs from the prevailing and is less than 3 miles. |
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Runway visual range RVR |
Is reported when the prevailing visibility is 1 statute mile or less and/or the RVR for the designated Runway is 6000 feet/1830 meters or less. |
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Clouds |
Reported in eighths for coverage and hundreds of feet AGL for heights. Automated systems to not report Cloud bases above 12000 feet. |
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Temperature and dew point |
Reported in Celsius. First two digits are temperature and second two digits is the dew point. M means minus or below zero. |
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Squall line |
Are identified by a line of high radar reflectivity. |
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Microburst |
May have 100 knots of wind and severe downdrafts which can greatly impact takeoff and Landing. Are short in duration small in size compared to thunderstorms. |
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Combat Weather Team CWT |
Primary point of contact for briefings and operational weather support. |
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METAR FLOW |
Station, date/time, auto a01/a02, correction, winds with gusts, wind variability, visibility, rvr, types of weather, clouds, temperature/dew point/altimeter, remarks |