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INSTRUCTIONS
IMPORTANCE OF UPPER AIR WINDS
The Weather Bureau, in its uppcr air wind program, must ltcrp
ahead of the rapid advancement in the field of ctviation and anticipatr
its necds. The war has necessitated the building of planes which are
faster and have a much higher ceiling than those uwd hcrctofon:.
While these planes can fly abovn the wcdier, it is essential that information
on wind directions and velocities bc availablcb Tor current us(! and
for operational planning for tho poRt war era. A large numbcr of rcquests
have boon received for wind data at high altitudes arid in one
cam the request called for data at 100,000 feet. Such requrcrts prcsent
a real challenge to the Burcuu and onc which cnnnot be ignored.
I It
is nccrssary, thrrefore, tliat every effort bc madr to follow pibab
and rabals to thc greatrst powiblc heights. While this mattw has been
brought to the observers’ attention on numrrous occwions, it is HO urgent
that we feel justifid in strrcrcring it8 importance again. Scvrral station@
havc bcrn making rabals rclguln,rly while othcrs havo don0 nothing in
this matter. Ihch station ~hould be ablr to arrange its sch~dul~~ PO
tlint at least ~everal rabalH could be made rncli month.
In this connection, it is requeated that each raob station kwp II. careful
record of tht. nunibcr of rabnlR madr during the nionth of Augd
,11344, togethtir with tlio lieiglitn attained. At t h end ~ of tlie month thi@
rcport should Le mailed to tho Central Oflice, Station Opcrationa
Division,
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ANALYSIS CODE (WB 134s)
Effective June 1, 1944, revised code tables for fronts and pressur0
systrms were adopted for use in Weather Bureau analyRis code,
U’B 1345. Explanation of the changc and copies of the new code car(],
W13 1845, Supplement No. 1 (Rev.) were furnished with circular letter
36-44 dated April 25, 1944. Extra copies of the circular letter a d
the code card rnay be obtained from Regional Offices.
Tho following notee are furnished for additional inforination :
1. IJndor P,, code figure (( 7” will be used by ttic Werttlior Burcuu to iiicuii ( (~qa~ll
line!’
2. Under I?,, code figure (( 1” iH UHC~ intcrchnngcubly to irieun cithor tt Weuk, do*
crertsing:’ or ((~rontolyclis!’ Binco tlie urn of cocie figure 1,’ will not alwnyn iinpll
that the front is disappearing, fronts dmignated by this nurnbor shonld be labeled
((Weak, decreuaing!’ In the flume Imnner, tr:3” ie ueed interchsngcubly to 1nufiP
either ((Weak, increasing:’ or “Frontogsnesis:’ and fronts eo designated should be
lubeled (( Weak, increasing” if they have appeured on the ?nap previously, or sliol1lJ
lo labeled (( ProntogeneW if they have not uppeared previously.
3. Under F,, code figure trO: “No specification:’ will be irscd when tlie front ie
completalg specified by F, and Pi. Code fiaures ((1;’ ((27 and ((37 referring p’
(( Frontul activity urea: urc intended priiriurily for ULIO in tropical analysis und wlll
not ordinarily L10 uwd e1acwhet.e. Code riutnber (( (i:’ “Quad-stutionuryy iiiuy bo
iH tft): ~~~cc~usion:’ IJut not when “CZutisi-etationsry’, tius u~rnlrdY
uwd for F” wlien F~
beon specilleil in F,.
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