k4 review | 410 - 909 Coding, 4E'sss, wind

The 909R_td_c shall be used to indicate the ______ and ______

time at which precipitation began or ended, duration and character of precipitation

The 909R_td_c shall be reported whenever group _____ is encoded and the _____ of this group is not encoded as 000

6RRRt_R, 000

The 931ss group shall be used to indicate ______ and:

• The measurement is reported in ____, up to 55 cm

• Measurements above 55 cm shall be encoded in accordance with Table 15-31

• The group shall be included at the discretion of the RDG, but only by stations that take 4 staffed synoptic observations daily and when the rounded measurement is 1 or more

• depth of new fallen snow

• whole centimetres

When selecting the R_t code and there is a choice, use _____.

the smaller code figure

When there are 2 or more time periods of precipitation, always use the _____.

last period

When you have coded ww = 50-98, use the time ____.

at which precipitation began

When you have coded ww = 20-27 and 20, this implies precipitation was in the last hour; therefore use the time ____.

when the last period began

For all ww codes other than 20-27, 29, and 50-98, use the time ____.

that the precipitation ended

The symbol R_t indicates the time at which precipitation given by _____ began or ended. It shall be coded with reference to _____.

RRR, the official time of observation

The symbol d_c indicates the ____ of precipitation given by RRR.

Occurrences of precipitation shall be considered as separate periods of precipitation when separated by intervals of _____.

duration and character, 15 minutes or more

Code the following R_td_c

Precipitation Type: -RA

Start: 0817

Stop:

90942

Code the following R_td_c:

Precipitation Type: -RA

Start: 0817

Stop: 1133

90942

Code the following R_td_c:

Precipitation Type: -RA

Start: 0817

Stop: 1028

90920

Code the following R_td_c:

Light rain began at 0211Z on the previous day

Precipitation Type: -RA

Start: →

Stop: 0639

Precipitation Type: -RA

Start: 1016

90927

Code the following R_td_c:

Precipitation Type: -SN

Start: 0628

Stop: 1139

Precipitation Type: DRSN

Start: 0812

Stop:

90912

The 931 group records the depth of newly fallen snow which has fallen during _____ or the time 7wwW₁W₂ group assuming _____ has taken place.

the preceding 6 hours, no melting or compaction

Amounts greater than 57 cm are rounded to the _____; hence, 58 cm would be rounded to _____ and coded as per chart.

nearest 10 cm, 60 cm

Section 5 entries are made at ____ to give a summary of the previous 24 hours of applicable weather elements using groups 1-4. These groups are mandatory in that report.

the 0600Z synoptic

The symbol s_ws_ws_ws_w indicates the amount of water equivalent in _____, of the 24-hour snowfall ending at 6,000 UTC.

tenths of a millimetre

In the HWOS, input 1sss and s_ws_ws_ws_w are input how?

Exactly as they are, with no rounding.

The group d_md_mf_mf_m is reported only when f_mf_m exceeds ____.

16 knots

If a station has no serviceable wind speed detector for any period during the climatological day, data must be reported as _____, and the group shall be recorded as _____.

missing, 3xxxx

The symbol dmdm indicates the direction, in _____, of the maximum wind for the 24-hour period ending at _____.

tens of degrees, 0600 UTC