From the ABC 7 Weather team

Heavy rain and flooding expected tonight and friday

May 14, 2014 - 09:55 AM
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A super soaker storm is heading our way.

 

A flash flood watch has been issued for the large majority of the WJLA viewing area starting this afternoon in the Shenandoah Valley and tonight for the metro area. The watch is scheduled to remain in effect through Friday. Flooding rain has pounded parts of the south including Texas and Arkansas. Now, that heavy wet weather is heading to the East. this could be a similar situation to what happened April 30th when many rivers lifted out of their banks, but quickly receded leaving a muddy mess. 

(This Afternoon)

A cold front associated with an upper-level feature is now located in the Ohio and Tennessee River Valleys. Low pressure will lift along the front and will draw in tropical moisture ahead of it. Plenty of moisture is already in place here as witnessed in this morning's fog, so we expect to squeeze out significant rainfall.  


(Quantitative Precipitation Forecast - NWS)

The latest local rainfall forecast focuses the heaviest totals in the mountains, but an inch or two is possible in the metro area. Here is our most recent futurecast.
(Computer Projection of Rainfall through Friday)

2-4 inches of rainfall is possible in general. While we could use some rain to spruce up grassy surfaces and plants, we have a spring surplus and this next batch of rain will be too much in a short period of time.

(Rainfall Departure)

All the rain and run-off could lead to river flooding. The Mid-Atlantic River Forecast Center has highlighted our region for this possibility.  

 

 

 

 

(River Flood Outlook)

The worst of the weather arrives late on Thursday and continues through much of the day Friday. I expect the Friday morning commute to have significant delays due to heavy downpours and standing water on roads.There could even be some road closures. As always, if you encounter these conditions, slow down and turn around. You never know how deep the water is over the road or whether or not the condition of the pavement has been compromised. It only takes 6 inches of moving water to knock you off of your feet and 12 inches of moving water can lift a small car. Drier conditions will be arriving late Friday and high pressure settles in for a sunnier, cooler weekend.

 

 

 

 

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