UFOB IHDEX CARD AISihlDIIlB-372..SS 2. LOCATION 12. CONCLUSIONS eatU.t1d to. be at ... ., 20 it appea.a te 11e d 1S A ISO P prorm 5 (15 Oct 54) WESTJ IHEIJ 'fo.TLJRAJTONoRTJI IJfA ~ EC rAoi\J 1 C. 2 I Dc.TOBtR 55" 01-YOZ. (NIGHT) /~OR :zo St!C.. O'BloAJG.. -FtJz.z.y o~s I (I I I I (I t I I (r t TI M E (GCT) OAT~ (GCT) TIME (GCT) DATE (GCT) TIME {GCT) DATE (GCT) EXPLANATION ISOBARS are straight, horizontal brown lines. The heights in feet of the pressure surfaces in the U.S. Standard atmosphere are in parenthesis () below the pressure values on the left. ISOTHERMS (C) are the straight, equidistant brown lines running diago- nally upward from lett to right . ORY ADIABAT.S are the slightly curved brown lines that intersect the 1000mb . isobar at intervals of 2c. and run diagonally upward from right to lett. The Dry Adiabats tor the folded portion of the pressure range are labeled with two ( 2) values. (See below). SATURATED ADIABATS are the curved green lines that intersect thelOOO mb. isobar at Intervals of 2"C, diverging upward and tending to become par ai to the dry adiabats. SATURATION MIXING RATIO (in gm. per kg.) is represented by dashed green lines. Their values appear at the bottom of diagram. THICKNESS (in hundreds of geopotential feet) of the layers between the levels 1000, 700, 500, 300, 200, 150 and 100 mb. is represented by num ers and a graduation along the middle of each layer. The thicknesses are obtained from the virtual temperature curve by the equal-area method, using any straight line as a dividing line. HEIGHT in geopotential feet above mean sea level, or station level, of the 1000 mb. surface is obtained from the nomogram in the upper lett-hand corner by drawing a straight lin e from the point on the temperature scale ("F) through the point Po (mean sea level or station pressure) on the pressure scale, and reading the height on the height scale. U.S. STANDARD ATMOSPHERE SOUNDING is indicated by a thick brown saturated adiabats and lsopleths of saturation mixlna ratio are com- puted y use of vapor pressure over a plane water surface at all temperatures. Exten~on of chart to 50 mb has been accomplished by overlap with pressure indicated in brackets, [ 200] at 400 mb, and [ 50] at 100 mb. Dry adiabats for tile overlap are labeled in parentheses ( ) . APPROXIMATE VIRTUAL TEMPERATURE may be obtained from the formula T~ = T +! 19tle~. T~' l~ vi rtual temperature in c. T is free air temperature in c, an~ 'N Is mixipt''ratio in &rams/ kilogram. For purposes of thickness computation, use the meaa temperature of the layer for T and use the mean mixina ratio of the layer for w. Sounding data will be entend"'lt-two ( 2) sets of charts. One chart will include 0300Z and lSOOZ soundlnp; the other 0900Z and 2100Z soundinp . To provide. twelve ( 1 2) hour continuity the precedlnr l500Z or the 2100Z soundinp, whichenr ttle case m111 be, will be entered as a trace of the tem- peratura curve witbwt the ra,.occ.atioo of data or circli:~g of aoy point. Blacll dots alont wind scale IIMI Indicate the le111s for which wind: d.ta is reported and plotted. The ot*l circles o Indicate the mandall!l}:' pressure levels at which wind data is lso entered . w t;j 1Ct.!5 USAF SKEW T, log p TEMPERATURE IN DEGREES FA H RE NHEIT l t'l t I I I Ill I PUBLISHED BY THE AERONAUTICAL CHART AND INFORMATION CENTER, All\ PHOTOGRAPHIC AND CHARTING SERVICE. (MATS) UNITED STATES AIR FORCE. ST. LOUIS 18. MO. APRIL 1952 CACIC) BASE NO. 1 FAHRENHEIT TEMPERATURE SCAL E Form: AWS W 0 PC 9-16 I 'Z!:JOj I 1zo1to1oo ltlt!.t.l 111 ueylelll 11111111 utal