Heavy storms could bring flooding to parts of D.C. area tonight
Rainfall rates could reach 2 inches per hour, increasing the possibility of overflowing streams and flooding in areas with poor drainage.It’s much harder at night for drivers to spot areas of ponding and flowing water, so extra vigilance is needed. Please heed the important advice to “turn around, don’t drown” if you encounter a flooded road.At play through tonight is an approaching low-pressure system with a stalled frontal boundary over the region.
At higher altitudes, an intensifying disturbance embedded in the jet stream is approaching from the Ohio Valley, shown below. It will increase uplift of air over our region, particularly during the evening and overnight hours. Meanwhile, atmospheric moisture levels will be very high for this time of year. Precipitable water, a measure of this moisture, may exceed 2 inches — or twice the norm . Those 2-inch pockets are highlighted in red in the forecast map below.
The combination of an increasingly unstable atmosphere, dynamic uplift and a nearby frontal boundary — along with brisk winds in the middle atmosphere — raise the possibility of isolated severe thunderstorms into the evening.The Weather Service’s Storm Prediction Center has declared a Level 1 out of 5 risk for severe storms. The main threats will be intense lightning and isolated instances of small hail and damaging wind gusts.
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