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Thursday, 21 September 2017
  
LIGHT RAIN
10 Celsius
NW Moderate 
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FAQ

Frequently Asked Questions

What does Synoptic Code look like?

SECTION 0

ii iRixhVV

SECTION 1

Nddff 1snTTT 2snTdTdTd 4PPPP 5appp 6RRRtR 7wwW1W2 8NhCLCMCH

SECTION 3

333 1snTxTxTx (@1800 UTC) 2snTnTnTn (@0600 UTC) 3EsnTgTg (@0600 UTC) 4E'sss (@0600 UTC) 8NsChshs 9SpSpspsp


SECTION 5

555 1V'f'/V'f''f'' 2snTwTwTw iiirrr.

Interpretation

SECTION 0

iii
Station Number

iRixhVV
iR Inclusion or omission of precipitation data (Table 1)
ix Inclusion or omission of weather group (Table 2)
h Height of base of lowest cloud (Table 3)
VV Horizontal visibility (Table 4)

 

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SECTION 1

Nddff
N Total Cloud amount (Table 5)
dd Wind direction in tens of degrees (Table 6)
ff Wind speed in knots (Table 7)

1snTTT
1 Indicator
sn Sign of temperature (Table 8)
TTT Dry-bulb temperature in tenths of a degree Celsius

2snTdTdTd
2 Indicator
sn Sign of temperature (Table 8)
TdTdTd Dew-point temp. in tenths of a degree Celsius

4PPPP
4 Indicator
PPPP Last four figs. of air pressure (reduced to me sea level) in millibars and tenths

5appp
5 Indicator
a Characteristic of pressure change (Table 9)
ppp Pressure change over last three hours in millibars and tenths

6RRRtR
6 Indicator
RRR Amount of rainfall (Table 10)
tR Duration of period of RRR in units of six hours. Main hours only At 0001 and 1200 UTC tR=1 At 0600 and 1800 tR=2

7wwW1W2
7 Indicator ww Present weather, manned station (Table 11)
W1W2 Past weather, manned station (Table 22)

8NhCLCMCH
8 Indicator
Nh Amount of low cloud, or medium cloud if no low cloud present (Table 5)
CL Form of low cloud (Table 13)
CM Form of medium cloud (Table 14)
CH Form of high cloud (Table 15)

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SECTION 3

333
Regional Indicator

1snTxTxTx
1 Indicator
sn Sign of temperature (Table 8)
TxTxTx Maximum temperature 0600-1800 UTC in tenths of a degree

2snTnTnTn
2 Indicator
sn Sign of temperature (Table 8)
TnTnTn Minimum temperature 1800-0600 UTC in tenths of a degree

3EsnTgTg
3 Indicator
E State of ground without snow or measurable ice cover (Table 16)
sn Sign of temperature (Table 8)
TgTg Grass minimum temperature rounded to nearest whole degree

4E'sss
4 Indicator
E' State of ground with snow or measurable ice cover (Table 17)
sss Depth of snow (Table 18)

8NsChshs
8 Indicator
Ns Amount of individual cloud layer (Table 5)
C Form of cloud(Table 19)
hshs Height of base of cloud layer (Table 20) Up to four layers of significant cloud can be reported (using 8NhChshs groups). The rules for the selection of significant cloud layers are: 1. The lowest layer of any amount 2. The next lowest layer of 3 oktas (eighths) or more. 3. The next lowest layer of 5 oktas or more.

Any cumulonimbus cloud not already reported under 1, 2 or 3 above, regardless of amount. Clouds are reported in order of ascending height. Cumulonimbus cloud reported under rule 4 above would be inserted between the other groups at its correct height level - regardless of the amount of Cumulonimbus being reported. 9SpSpspsp 9 Indicator This group is included when necessary to report special phenomena

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SECTION 5

555 National indicator (This section is not sent when there are no data to report)

1V'f'/V'f''f''
1 Indicator
V'V' Visibility in metres (reported when visibility is less than 100 m)
(f')f'f' Speed in knots of the maximum gust in the past hour (>33 kts)

2snTwTwTw
2 Indicator
sn Sign of temperature (Table 8)
TwTwTw Sea temperature in tenths of a degree


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Code Tables

Table 1: iR Indicator for inclusion or omission of precipitation data

Code
Figure Precipitation data are reported:Group 6RRRtR is:
1 in Section 1 included
2 in Section 3 included
3 in none of the two Sections 1 and 3 omitted (precipitation amount =0)
4 in none of the two Sections 1 and 3 omitted (precipitation amount not available)

Note: UK practice only, code figures 1,3 and 4 to be used

Table 2: ix Indicator for type of station operation (manned or automatic)and for present and past weather

Code
Figure Type of station operation Group 7wwW1W2 or 7wawaWa1Wa2 is:
1 manned included
2 manned omitted (no significant phenomena to report)
3 manned omitted (not observed, data not available)

 

 



 


 
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