340 
CLINE. 
comes very hot and dry vegetation suffers generally, but as a 
rule it recovers, except in those streaks visited by the in¬ 
tensely heated currents, although the yield is reduced some¬ 
what and is reduced materially if two or three of these 
periods follow each other in rapid succession, as has some¬ 
times been the case. 
Prof. J. T. Lovewell,* speaking of the damage to crops in 
1887-88, says: “ During both these years we heard many 
“ complaints of blighted crops, but the cause was not wholly 
“ a dearth of rain. When the hot period of July came dur- 
“ ing the last season (1888) it was accompanied by a high 
“ scorching southwest wind which prevailed for several 
“ days, sweeping from the southwest corner up through the 
“ middle of the State and cutting short the corn crop through 
“ the breadth of several counties. These hot winds contrib- 
“ ute more to the failure of crops in our State than does the 
“ lack of moisture in the soil.” 
* i 
In studying the distribution of pressure in connection 
with hot winds it is found that they occur mostly with low 
pressure areas which have moved slowly from the north of 
Montana southeasterly along the eastern slope for three or 
four days before they take up a decided movement east¬ 
ward. They sometimes accompany a low pressure area 
which develops over some part of the eastern slope and re¬ 
mains nearly stationary or moves slowly north or south 
along the eastern slope for a few days before moving off, 
and occasionally they accompany low pressure areas which 
have moved slowly across the divide from the Pacific coast 
and then move slowly north or south along the slope before 
moving off eastward. Of the thirty-five periods of hot 
winds twenty-eight occurred with low pressure areas which 
have moved southward from northwestern Montana. One 
accompanied a low pressure area which moved from the 
Pacific coast across the divide to the central slope, and the 
remaining six developed over some part df the eastern slope. 
* In Sixth biennial report of the Kansas state board of agriculture. 8°. 
Topeka, 1889, part 2, p. 214. 
