236 F. Waldo—Rise and Fall of the Wind in the U. S&. 
can be indicated in a general way for the various regions of 
the U. 8. 
For January immediately along the Mississippi River Val- 
ley there is a rise of wind during 6 hours. To the east of this 
there is a decrease to 4 hours at the north, along the Great 
Lakes, with a slight decrease to 5 hours at the center just east 
of the Alleghany Mountains, and in the extreme southeast of 
the U.S. But near the Atlantic coast there is an increase to 
7 hours. 
To the west of the Mississippi Valley there is a rather rapid 
decrease to 3 or 4 hours at the north. At the center there is 
an immediate increase to 7 hours on the 97th meridian, then a 
decrease to 3 hours at the 105th meridian in central Colorado, 
then a slight increase to 4 or 5 hours, then another decrease to 
3h. in central Nevada, from which there is an increase to 7h. 
or more on the Pacific coast. At the south there is a decrease 
to 4h. in central Texas, then an increase to 7h. in southern 
New Mexico, then a decrease to 3h. in southern Arizona, and 
an increase to 5h. on the South Pacific coast. There seems to 
be about the same time of rise on the not exposed Pacific and 
Atlantic coasts north and south; and also on the eastern and 
western Gulf Coast. 
for July, along the 92d meridian, which lies just a little to 
the west of the Mississippi River, the time of rise of wind is 
about 7 hours. To the west of this there is: at the north, an 
increase to 9h.; at the center at first little change and then a 
slight increase to 8h., which, on the Pacific slope, increases 
suddenly to 11h. ; at the south, at first a rapid increase to 10h. 
and then a rapid decrease to 5h. in southern Arizona, and 
finally a return to 7h. on the southern Pacific coast. 
To the east of the central 7 hour region, of longitude 92° 
passing through Duluth, there is: at the north an increase to 
9h. on the Upper Lakes, a return to 7h. on the Lower Lakes, 
and an increase to 9h. on the Atlantic coast; at the center an 
increase to 8h. for most of the region and to 9h. on the coast, 
but with a relapse to 7h. just east of the Alleghany Mountains ; 
at the south there is an increase to 9h. on the Atlantic coast, 
but along the Gulf of Mexico a decrease to 5h. 
On the eastern Gulf coast the rise is for 5h. and at the western 
coast it is 10h. On the Atlantic coast for exposed stations 
there is a decrease from 10h. at the north to 5h. at the south 
of Florida; while for the stations where the land influence is 
more predominating there is an increase from 8h. at the north 
to 10h. at the south. On the Pacific coast there appears to be | 
a decrease from about 10h. at the north to 7h. at the south for 
the better land exposures. 
