Weather Bureau topics and personnel / United States Department of ...

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of signals in each case to about 100 in order that transnlis~ion on thc
long lines would not occupy over 16 minutes.
Owing to the necessity for reducing transniissions to tlic miniiiiuni, it
was also necessary to hnvr some of the codc words, not ncudod for airways
service, cut from the signals at the sending centers before transmission
wart made by teletype. ApparcAntly sonic confusion line nristm
regarding this, arid in order to clarify the matter the following is proniulgated
for the information and guidnncc of all concrrncd, cffectivc
December 20, 1932:
(a) Signals, loth a. rn. and p. m., for stations not listed in Ixmgraphs
9 and 10 of the circular, “Changes in Airways Service for the Purpose of
Effecting Economies”, dattd Novcniber 16, 1932, will includc, in tho
order nurr~ed, oiily words for prcwurc and trmporatura ; direction of wind,
state of weather, and wind velocity; pressure change and iririxiinuin or
minimuin ternpcmture; the, character, and amount of prcciyitution ;
thunderstorms. No other words will be transmitted in thew rcports.
(b) Signals, both a. m. and p, m ., for the rttations listed in paragraph
0 of the oircular wjll include, in the order 12(17ned, only code word6 for
pressure and temperature; direction of wind, fitate of wcather, t~nd wind
velocity ; prcssure change and maxinium or minimum tcn~~)eraturc ;
precipitation ; thunderstorms; clouds.
(c) Signals from stations listed in paragraph 10 of the circular will
include the code words listed in paragraph (a) above, in the order nwmed
thewin, plus an additional 6-letter word for ceiling, vieibility, and dew
point, which will be placcld at the end of the report.
The foregoing refers only to signals transmitted from San FranciPco
and Chiccyso by ttJctypr, and does not change or nlter my other type
of transniission now made. The personnel at those points will “cut”
the signals in accordance with the foregoing.
Station deeignators will bc uecd for transmimion on the long linc8
instead of station numm. Theso will be entercd by tho Ikpartment of
Comrncrce personnel at thc time of trunemiwion.
Preemre chnngee.-In order to cotiform with the prcscnt prwticc requiring
the entry of prc’ssure changes for the thne hourrt itninetlintcd9
preceding the 8 a. rn. and 8 p. in. (IC. S. T,) observations, in the regular
flignal reports, pressure clianyes will be rclportctl at each of the 4-hourly
periods for the three hours iinrnediatrly preceding thc? observations, e. B. t
thc pressure change reported in the 4 p. m. 4-hourly obsc~vution would
be for three hours beginning at 1 p. in. Undtir this syatein only stations
equipped with barographs, or those nialring hourly rqortR, will include
this element jn tho 4-hourly reports.
The above-mcntiond circular entitled “Changp~ in Airways fiervioe
for the Purpose of Effecting Economics” was inailed to all stations in
the continental United States on Noverribcr 18, 1982. Any station not,
receiving a copy should inimediatc4y inform this oflice.