Tuesday afternoon update
UPDATE 9:15 pm: Technically speaking today was dry and sunny as the storms occurred after sunset. So why did these storms fire up? Colliding outflow boundaries, that’s why. This radar grab shows two boundaries approaching each other southwest of Fredericksburg (purple arrows).
These outflow boundaries are from earlier storms that collapsed and pushed out wedges of rain-cooled air. These features act as mini cold fronts and when they collided the humid air between them was forced upward and voila!! New storms formed and moved northward thru the Fredericksburg area.
This visible satellite image from 12:45 pm shows a back door front (blue dotted line) sliding down the coast toward Fredericksburg and clouds building along the eastern slopes of the Blue Ridge mountains (white dotted line). While today will remain dry and sunny with a high temperature in the low 90s Wednesday will be about ten degrees cooler with showers and thunderstorms likely.
More details in tomorrow morning’s blogpost. Happy Tuesday!