Table 3-6.Synoptic Reporting Times for Maximum and Minimum Temperatures for U.S. Stations in WMO Regions IV and V
TXTXTXfor past 12 hours and
TnTnTn for past 18 hours.
TnTnTn for past 24 hours.
TXTXTX for past 24 hours and TnTnTn for past 24 hours.
TXTXTX for previous calendar day ending 2400 LST, and
TnTnTn for past 12 hours .
TXTXTX past 24 hours.
TXTXTX for past 12 hours and TnTnTn for past 18 hours .
STATE OF THE GROUND WITHOUT SNOW
OR ICE.3Ejjj. The E is the state of the ground
(WMO code table 0901), and jjj is regional information.
(Group is not reported in WMO Region IV.)
SNOW OR ICE ON THE GROUND.4E'sss.
The E' is state of snow or ice covering the ground
(WMO code table 0975) and is reported in WMO
Region IV as /. The sss is the average snow/ice depth in
hundreds, tens, and units of centimeters.
5j1j2j3j4. The j1 is the information designator (WMO
code table 2061), while j2j3j4 and, if necessary, the
following group, j5j6j7j8j9, contains the coded
Cloud Movement.56j2j3j4. In WMO Region V,
U.S. stations use this group to report cloud movement
pertaining to the clouds reported in the 8NhCLCMCH
group for the low-, mid-, and high-etage clouds,
respectively, and is not reported in Region IV.
24-Hour Pressure Tendency.The 58p24p24p24
group is used to report a net increase or no net change in
the 24-hour pressure tendency in tens, units and tenths
of hPa. The 59p24p24p24 group is used to report a net
decrease in the 24-hour pressure tendency. The 24-hour
tendency is reported only in each of the main synoptic
reports in the southern part of Region IV instead of the
5appp group in section 1. In Region V, U.S. stations
report the 5appp group but additionally report the 24-
hour tendency at 0000Z and 1200Z.
group is not previously reported in section 1, some
regions report this group in the supplemental data
2 4 - H O U R
P R E C I P I T A T I O N .
7R24R24R24R24. This group is included in all synoptic
reports in Region IV unless no precipitation was
received. The R24R24R24R24 is the 24-hour total liquid
equivalent precipitation in hundreds, tens, units, and
tenths of millimeters. A trace (<0.005 inch or <0.05
millimeter) is encoded 9999.
CLOUD LAYER DATA.8NSChShS. This group
reports the amount, predominant type, and height of
cloud in a layer, and may be used four times to report
four individual layers. The NS is the amount of cloud in
oktas, the C is the predominant cloud type (WMO code
table 0500), and hShS is the height of the cloud base
(WMO code table 1677). This group is used by select
stations in WMO Region IV.
SPECIAL INFORMATION.9SPSPSpSp. This
group may be used to report special information in the
International code, as selected by regional decision.
The SPSP indicates the type of data (WMO code table
3778) while the SpSp is the specific data. This group is
not generally used in Region IV or by U.S. stations in
Regional Mountain Station Data
Indicated by the group 444, section 4 of the report
contains information generally reporting clouds with
bases below the station level (mountain stations). All
data other than N'C'H'H'Ct is in regionally decided
code. The International code N'C'H'H'Ct is described
by WMO code tables 2700, 0500, and 0552 for N, C,
and Ct, with H'H' the top of the cloud mass in hundreds
of meters. It is not generally in use in Region IV or by
U.S. stations in Region V.