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~BARB we etrsl@rt, horlzonfal brown lines. The heighte (n fed ti b pressure surfwes in the U.S. Stsndwd atmosphere we in persnthesis () beh the pressure values on the left. DRY ADlABAT3 me tho slightly curved brown lines thet Intersect the 1000 mb. The Dry Mlabeb**bfded~d the preeeun mngewelsbefod SATURATED ADIABATS me ths curved green lirms thst Intweect the 1000 ffnes. Their veluee appesr St tfm bottom of disgrem. THIOKNBS (hr hundreds of gaopotentiel feet) of the Isyers between the fevels 1000,700,500, S00, 200, 150 end 100 mb. is represented by numbm end e graduation elong the middle of lsch Isyer. The thicknwses em obteined from Uro vitiuel temperature cuwe by the equel-sme method, using tny streigkrt line 88 e dividing line. HEIGHT in geopotentiel feet ebove meen sea level, or stetion level, of the 1000 mb. eurfece is obtsirred from the nomogrem in the upper Ieft-hsnd comer by dmwing a etmight line from the point on the twnpereture sale pmssum ewle, end reeding the height on the -height swle. U.S. STANDARD ATMOSPHERE SOUNDING ix indicated by e thick brown The eetumted ediebsts snd Ieopleths of eetumtion mixing mtio em computed by use of vepor preseum overs plsne wster surfsce st ell temperatures. Extension of chert to 50 mb hss been accomplished by overlsp with Dry ediebets for the overiep are Iebeled in parentheses ( ). APPROXIMATE VIRTUAL TEMPERATURE may be obteined from the formula 1In %, en w is mixing mtio in grems/kilogrsm. For purposes of thickness oomputetion, use the mesn tempemtum of the Isyer for T snd use the mean mixing retio of the Ieyer for w. Sounding dete will be entered on two (2) eets of cherts. One oherf will include 03002 end 15002 eoundln~, the other 09002 end 21OOZ soundinge. To provide twelve (12) hour continuity the prewding 15002 or the 21OOZ soundings, whichever the owe mey be, will be entered es e tmw of the tempemture cuwe without the reproduction of dste or circling of eny point. Bltck dots l elong wind ecele lines hrdiwte the levels for which wind dete Is reported and plotted. The open circles O indiwte the mendetory preeeum levels st which wind dete is eiso entered.
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