1. All three extremes were related to a blocking high pressure system stalled over the upper Middle West this week. 2. Blocking high pressure over Canada has diverted the active jet stream far south, setting the stage for a very damp Tampa. 3. For much of the month, a blocking high pressure system over the Bering Sea has diverted low pressure systems south of the region, thereby suppressing snow. 4. Rain and snow were spawned by a Pacific disturbance that slipped under a blocking high pressure system that was shielding the Pacific Northwest from storm systems. 5. The slow chill in Rapid City came courtesy of a blocking high pressure system over northern Canada. 6. This week, the Pacific jet stream was diverted south by a blocking high pressure system over western Canada. |
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