11. Alaska's memorable warm-up was nurtured by an expansive ridge of high pressure centered over northwest Canada. 12. This is attributed to a persistent subtropical ridge of high pressure located north of the cyclone. 13. The following day a decreasing ridge of high pressure to the north and a inHg ). 14. An expansive ridge of high pressure will spread over the upper Middle West and Northeast Thursday. 15. A strong ridge of high pressure continued to push the system west, towards the Caribbean Sea. 16. Much of southern Africa will be partly sunny and dry under a ridge of high pressure . 17. But much of the Plains was dry and hot, dominated by a ridge of high pressure . 18. A ridge of high pressure was to bring some afternoon thunderstorms in central and southern Florida. 19. Much of the West was dry as a ridge of high pressure settled over the Great Basin. 20. A ridge of high pressure will stretch down the St . Lawrence Valley to the Gulf Coast.
