Fe Section 2 Metar

Front 1

Metar report

Back 1

Aviation routine weather reports

Observation taken 55-59 min.

Front 2

SPECI

Back 2

Unscheduled observation when a pre defined condition criteria changes to an original Metar report

Front 3

Auto

Back 3

Refers to an observation taken from an unattended automated surface observation system (ASOS).

Front 4

AO1

Back 4

Is an ASOS without a rain vs Snow discriminator

Front 5

AO2

Back 5

Is AN ASOS WITH a rain vs Snow discriminator

Front 6

COR

Back 6

Is an observation corrected for an error. Disregard the previous transmission.

Front 7

Wind direction

Back 7

Reported wind direction and magnetic north. Reported in knots and true Direction

Front 8

Prevailing winds (sustained)

Back 8

Is the average Direction / speed over the 2 minutes CONUS 10 minutes OCONUS notice immediately preceding the observation.

Front 9

Gusts

Back 9

Are a sudden brief increase in speed with a variation of 10 knots or more between Peaks and lulls. 10 minutes immediately preceding observation.

Front 10

Squall

Back 10

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.

Front 11

Wind variability

Back 11

Is reported if the direction varies by 60 degrees and speeds greater than 6 knots. Separated by a V.

Front 12

Prevailing visibility

Back 12

Is the greatest horizontal visibility observed throughout at least half the Horizon Circle and is not necessarily continuous.

Front 13

Sector visibility

Back 13

Reported in the remarks section if it differs from the prevailing and is less than 3 miles.

Front 14

Runway visual range RVR

Back 14

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.

Front 15

Clouds

Back 15

Reported in eighths for coverage and hundreds of feet AGL for heights. Automated systems to not report Cloud bases above 12000 feet.

Front 16

Temperature and dew point

Back 16

Reported in Celsius. First two digits are temperature and second two digits is the dew point. M means minus or below zero.

Front 17

Squall line

Back 17

Are identified by a line of high radar reflectivity.

Front 18

Microburst

Back 18

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.

Front 19

Combat Weather Team CWT

Back 19

Primary point of contact for briefings and operational weather support.

Front 20

METAR FLOW

Back 20

Station, date/time, auto a01/a02, correction, winds with gusts, wind variability, visibility, rvr, types of weather, clouds, temperature/dew point/altimeter, remarks