| 11. | As the floes stack up there, they create pressure ridges up to 40 feet high.
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| 12. | On February 27, Cyclone Percy encountered a high pressure ridge which slowed its forward speed.
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| 13. | This massive but gradual collision of ice against ice creates pressure ridges in the glacier.
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| 14. | The ice sheets can crunch into each other, layering to form pressure ridges 50-feet thick.
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| 15. | By then they were just north of pressure ridges.
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| 16. | High-pressure ridges, low-pressure troughs and the jet stream crowd the weather map, battling for dominance.
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| 17. | Generally low humidity will prevail across the Northeast as Canadian high pressure ridges south from Quebec.
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| 18. | On the northern rim of the high pressure ridge, several severe long-lived windstorms called derechos formed.
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| 19. | Unusually warm weather has thrown up great pressure ridges of ice and opened large areas of water.
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| 20. | The farther west the high pressure ridge moves, the more the storm is expected to track west.
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