Monday 11:40 a.m.
With a large and growing upper-air ridge off the East Coast and stalled low pressure area aloft over the Midwest, the entire Eastern Seaboard is immersed in an extremely moist flow that stretches from Cuba to Quebec. Minor disturbances in the flow pattern are all that's needed to trigger lines, clusters and areas of showers and cloudburst-producing thunderstorms.
This overall situation is likely to persist through Wednesday. However, as the high pressure area offshore strengthens and drifts a little westward, showers may become less numerous by Wednesday in the I95 corridor. However, this basic trend means that showers and thunderstorms can extend to the western Great Lakes later tomorrow and Wednesday.
Since June's rainfall was excessive in much of the Middle and North Atlantic region (Philadelphia had its wettest June ever) the prospect of more rain raises the danger of flooding. This video has more.
This GFS model map shows predicting rainfall between for this week.
During our vacation at Hilton Head, S.C., last week, we went out on a kayak adventure on Tuesday morning. Fortunately, there are no known photos showing me paddling. However, with my trusty iPhone in hand, I took some pictures of waterspouts that developed just off the ocean beaches. The spouts were narrow, but in this picture I point to where they were at the time.
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