Larry Cosgrove: The luck of the Irish may just run out by St. Patrick's Day. I am sure that many of you have heard about the spike of warmer temperatures in much of North America in the 6-10 day period. But there are some concerns once we get into the mid-point of the month. We still have the same basic players in the pattern set this winter. An energetic storm sequence across the northern Pacific Basin. Persistent heat ridging over the Strait of Yucatan. And an ever-present and vigorous subtropical jet stream running from below Hawaii into the Deep South. Initially, the disturbances moving through California into Texas and then Georgia will be of small size, though occasionally associated with moderate/heavy precipitation during the course of the next seven days. One of the impulses will blow up well off of the East Coast, preventing the warmer air from reaching most of the Interstate 95 corridor until March 8-9. However, a particularly large system near the Aleutian Islands will dive into the American Southwest, accompanied by an Alaska/Yukon cold intrusion. Unlike its predecessors, this cyclone will enforce a change in the overall 500MB configuration. Around and after March 17, with a surface low moving from the lower High Plains to the St. Lawrence Valley. A colder transition will follow.