81.   A wind-driven snow fell across eastern Nebraska on Saturday as a low pressure system gathered strength over the Mississippi Valley.

82.   Ahead of the low pressure system, moist flow from the south out of the Gulf of Mexico will lead to showers in Texas.

83.   Along the direct path of the intensifying low pressure system, wet snow turned to sleet and then to a cold, hard rain.

84.   Brisk winds from the northwest on the west side of a pair of low pressure systems in New England will drive the cold air southward.

85.   But as the disturbance pivots southeast over the Gulf of Mexico on Saturday night, a low pressure system will form over the front stalled south of Florida.

86.   But growing temperature contrasts between the Arctic and Tropics can energize potent low pressure systems, which, when stalled, can produce very heavy rains.

87.   But for the last two weeks or so, the jet stream has detoured north and south around a high pressure system stalled over the region.

88.   But the measurement of snow is often difficult, given the fierce winds that are generated by intense low pressure systems over western Gulf of Alaska.

89.   But these windstorms are not a direct consequence of deep low pressure systems.

90.   But, as the tempo of low pressure systems over the Gulf of Alaska quickens in late autumn, the highest waves shift to northern shores.