21.   A weak surface trough southwest of Puerto Rico will continue to move westward away from the region.

22.   A weak upper level trough extending from the northeast Caribbean northeastward across the Atlantic influenced our area once again Thursday to produce active weather.

23.   A weak surface trough remains stationary just north of our area and continues to influence the local weather.

24.   A weak surface trough will continue moving west across the region this afternoon.

25.   A weak surface trough will continue nearly stationary north of the islands.

26.   A weak trough at the middle level of the atmosphere located northwest of our area will be moving to the southeast through Saturday night.

27.   A weak trough in the lowest levels of the atmosphere has moved westward across the extreme east and northeast Caribbean and the Virgin Islands overnight and this morning.

28.   A weak trough of low pressure in the lower levels of the atmosphere is moving slowly west through the northeast Caribbean today.

29.   A weak frontal trough was located southeast of our region this morning and was becoming very diffuse.

30.   A weak frontal trough...North of the islands...Is expected to approach our area on tuesday.

a. + trough >>共 117
level 20.20%
upper 15.79%
surface 11.81%
weak 11.38%
low 5.12%
frontal 3.98%
low-level 2.84%
public 2.56%
low-pressure 1.99%
mid 1.14%
weak + n. >>共 1092
economy 5.53%
demand 5.26%
dollar 4.29%
yen 3.36%
sale 2.82%
pressure 2.65%
currency 2.24%
link 2.15%
market 1.93%
spot 1.90%
trough 1.00%
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