Here We Go Again
Here we go again. Another round of rain, just 60 hours after a 1-2" rainfall across the Delaware Valley. A strong low pressure system in the Midwest will move east, with a secondary area of low pressure firing up over the Appalachians of North Carolina and Virginia. The secondary low to our south will help push east winds into the Mid-Atlantic and help feed moisture up against the mountains, bringing another round of significant rainfall to the Delaware Valley.
Rain will move into the Philadelphia region around Midnight Sunday night, becoming heavy late Sunday night and early Monday morning. Rainfall will continue off and on through the day Monday, becoming more and more drizzly in nature later in the day. With the secondary low pressure becoming the dominant low and staying south of the Philadelphia region, we will stay on the cooler side of the storm.
Rainfall amounts of between 1/2" and one inch will fall along the I-78 corridor and points north. South of I-78, general one to two inch rainfall amounts are expected, with some isolated heavier amounts possible across the Delmarva. Some stream flooding across the Wilmington region is not out of the question.
The bigger story of the upcoming Sunday night/Monday storm is the col air that will be expected across the region. East winds off of the cool Atlantic and a chilly upper level low moving overhead from the dying primary low pressure system will help keep temperatures quite chilly on Monday. It's possible that much of our region stays in the mid to upper 40's on Monday, which would be even chillier than the low 50's we had during the day on Friday. Across the mountains of Western PA, especially at elevations over 2000 feet, temperatures may be as cold as the 30's with a chance of snow mixing in with the rainfall during the early morning hours on Monday.
For what it's worth, Monday's "high" temperature will likely be at midnight and temperatures will fall into the low 50's by daybreak, so we will have little chance of joining the 15 May days since 1874 with a high temperature in the 40's in Philadelphia.
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