Temp. Sept. 18-2! 
Mean. Lemp. 
In left part of vertical cross-section 
sale: Air 1°C cooler than the 
average for this level 
| PH || Precipitation \ Cloud 
= => Air-current at heat source 
===> Air-current at heat sink 
September 
| -72° 
Km 
7 rl8 
—77 
-735 
ae +16 
-6f0 
etl ai oe 60 638 a 
1 =... pee 
=- NX ". 
-5I°s oan sha Oe +a? -530 +520 -5/0 -5/7 -515 -528 547 aah 
; EN TEs ZB =50—_ 
-3 7 +2 
nage 48 
| ae 
a 10 
—3)°o -45 : 28.5 -28B--30,3_-31.0 -3/6 2322 -32.6 -32.6 -347 — 34% [ 
: . om ° 
0" Ny a0 a 
oY 
a bile = - ee -253 
3 | \ 7 -20° 8 
-16°2 -24 amet at! 7 13,5 ~ PGS -/6.5 -18,0 18,4 -180 -177 -186 IGS 
pone = Cais 
a 320 -/37 
Dpe ree si Ss AP GUA 130 
- 5% -06 '- -a Toe “tle ~ 0 ° 8 
9 6 ‘05 4 -U8 *-liz -06 eas -4. $3 -65 -70-67-63 -~64% -65 -9H 
0. 
OS = 1. — 36 
ee ee +03 ba 
+40 
° 
+ 8.8 +07 +07 +06 +07 +02 +02 +73 49.0 +93 +90 +80 +95 +94 a +75 
----— ——— (PSS 
W +107 ° 
+187 
+173 *07T™*Q0 08 +07 +07 +02 t/75 +176 +/75 +180 +180 +181 +/73 +/8.0 +/6% 
+20 — +/93 
SS ee 300°— — — — —— +20%5 
it eee ET aj +257 fa) 
[eh BB 35 4a gon Geeeye ee88 9) {I0x102)Km 
T.B. 1949 E.P 1948 
In central and right part of vertical 
cross-section and in ground plan 
Heavy rain 
yy Main updraught region 
tthe fe 
V///, Light to moderate rain 
Isotherm °C 
Isentropic line °C 
Fra. 7—Mean vertical cross section of the major tropical hurricane passing SE U.8., Sept. 17-20, 1947, 
according to E. Palmén and T. Bergeron 
13 
