410.1a - purpose of synoptic observations

At full time stations, synoptic observations are conducted _____ daily, at _____ ZULU.

4 times, 00, 06, 12, and 18

A precise synoptic picture of weather conditions over a vast area of the earth’s surface is required in order to provide national and international forecasts and climatological data to satisfy the needs of _____.

aviation, agriculture, industry and the public

Which synoptic code sections are completed by land stations in Canada?

0, 1, 3, and 5

The common synoptic code comprises of 6 sections numbered _____, each of which is primarily composed of ____ code groups

0 to 5, 5-figure

Section 0 contains the _____, which is ____.

station identifier, automatically input into the HWOS system

We are only concerned with the ____ group in Section 1.

6, 7, and 8

In Section 3, we are only concerned with _____, the 4 group, as well as the _____ groups.

max/min temperatures, 909 and 931

In Section 5, we are only concerned with the ____ groups.

1-4

Group 6RRR_tR shall ______ in the message

always be

Group 7wwW₁W₂ shall be included only if _____ is observed during the previous synoptic period.

present or past weather

Group 8N_hC_LC_MC_H shall be included only if _____ is/are observed.

clouds

Group 4E’sss is included at certain times when there is _____.

snow or ice on the ground

Group 9SpSpspsp is included only if _____. It is included if _____ has occurred.

there are special phenomena to report, precipitation

The times of the main synoptic reports are 0000, 0600, 1200 and 1800 UTC. In all cases, the barometer shall be read _____.

at the hour

The observing, recording, and recording of all elements, except ______, should be done in the ______ preceding the hour.

pressure and tendency, 10 minutes