September 22 Flood Watch Expanded With Slow Moving Front

Wednesday September 22 2021

A slow moving weather system will spend the next two days in our region. This will provide some heavy rain over some of the same areas, which will enhance the flooding potential.

Fall officially begins at 3:21 PM, and it will start to feel like it.

While some rain showers will spread into central metro areas today, the bulk of the rain today will be west of I-83. Even heavier rain will fall in the mountains, including the I-81 corridor and through the mountains.

Warmer and dry weather will hold on one more day across much of Delmarva.

Excessive Rainfall Today

Flash Flood Watch

As I mentioned in a prior report, this was initially posted for the mountains where heavier rain will fall fall. It has been expanded to include southern Pennsylvania.

If you live in central Maryland, pay attention as this is likely to be expanded further into this region, where heavy rain is expected on Thursday.

Rainfall Potential —> slider

Compare three model forecast maps

Weather Set Up

Morning Surface Weather

A lot of moisture is already flowing in from the south. A slow moving cold front is the main event that will enhance the heavy rain and thunderstorms. This will enhance the rain in the mountains today, then cross metro areas Thursday. It will be off of the coast Friday morning.