21.   Rapidly falling water droplets from the shower move the air in a circle, creating a vortex with a low pressure center that sucks in the curtain.

22.   Rain will fall in the southern Plains near a low pressure center that will crawl northeastward.

23.   Rain will fall near the track of a low pressure center as it moves from northern Texas early Thursday to the central Mississippi Valley on Thursday night.

24.   Slow-moving showers and a few thunderstorms will surround a sluggish low pressure center over southern Minnesota.

25.   Steadier rain will fall to the north of a low pressure center as it moves east from the central Mississippi Valley early Sunday.

26.   The heaviest rain is expected near a low pressure center as it approaches the southern Oregon coast.

27.   The heaviest snow will fall just to the north of a low pressure center as it moves from northern Iowa toward the central Great Lakes.

28.   The snow and ice will spread to the Northeast on Tuesday as a new low pressure center forms near the Maryland coast.

29.   Wet snow may leave a small accumulation north of the track of the low pressure center over parts of southern Michigan, northern Ohio and northwestern Pennsylvania.

30.   Winds will increase throughout the Northeast later Monday as a low pressure center intensifies.