A strong mid- to upper-level trough eroded the western portion of the high-pressure ridge, steering Floyd to the northwest.

Once inland, Gert began to feel the effects of a high-pressure ridge to its northwest, causing the storm to again turn west-northwest.

The storm slowly strengthened as it tracked west-northwestward, a motion due to the presence of a high-pressure ridge to its north.

Twenty minutes later, they hit a high-pressure ridge that tossed Ro out of her bunk.

Mr. Lytle said the lack of moisture was caused by a large high-pressure ridge that was diverting low-pressure storm systems north into Canada.

A high-pressure ridge is building over Brazil's southern regions, locking out rainfall and lifting temperatures as high as 100 degrees Fahrenheit.

The presence of a large-scale high-pressure subtropical ridge on each side of the equator reduces cloudiness at these low latitudes.

The big high-pressure ridge was also responsible for diverting the jet stream to an almost north-south course through the Plains States during April and early May.

Because the big high-pressure ridge moved north of its normal position, it allowed moist tropical air to flow from the sea into the Middle Atlantic States.

However, early on October 19, Kiko turned to the northwest when a high-pressure ridge developed over Mexico.