22 TOR BERGERON 
water-level in some sections. Supplement 37 of 
the Monthly Weather Review is a report which 
contains many rainfall maps and tables, pictures 
and accounts of damage, descriptions of the 
weather and its changes, and also weather maps, 
relating to this catastrophe. But, as far as I ean 
26. VII. 1950 lis 
18" GMT 
i} 
SSS 
AOSSS3 
see, there is no real explanation, in all that big 
report, of the very striking fact that this precipi- 
tation maximum hes along the Ohio River Val- 
ley, whereas there is only little precipitation 
(down to 1 inch) up in the Appalachian moun- 
tains on the SE side of the valley. The Report 
Limit of cloud system 
Us Wherate (S heavy rain 
trot Cloudless 
=a OIG) 
Fictitious isobars 
—-—- Isallobars (3 hourly) 
Fo 3hr pressure fall <0.3 mb 
;| => "Surface” stream-lines 
.. Ground >1000m ab. s.-l. 
Fia. 17—Synoptic map over Scandinavia, July 26, 1950, 18z 
