51.   Weak frontal boundary southwest to northeast across Puerto Rico to drift slowly southeast today and tonight and slowly dissipate.

52.   Weak frontal boundary becoming nearly stationary across middle leeward islands thu.

53.   Weak frontal boundary will remain north of the area as it dissipates by tonight.

54.   Weak high-pressure ridge to remain south of frontal boundary from the central Atlantic to the southern Bahamas.

a. + boundary >>共 424
national 8.78%
political 3.71%
new 3.64%
frontal 3.51%
international 2.34%
maritime 2.34%
state 2.08%
geographical 1.69%
old 1.56%
traditional 1.50%
frontal + n. >>共 53
assault 17.06%
boundary 15.88%
system 13.24%
nudity 10.88%
trough 8.24%
attack 6.76%
crash 2.94%
zone 2.65%
collision 1.76%
cortex 1.76%
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