DC Area Forecast: Flood Warning Today, With Cold Conditions All Weekend

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flood hazard for DC and much of the immediate area until 4 p.m.*

8:40 a.m. — Flood warning extended for immediate area until 4:00 p.m.

One to three inches of rain fell across the region overnight, with light to moderate rain continuing. The National Weather Service has extended a flood warning until 4 p.m. for the district and immediate surrounding counties.

“Floods of rivers, creeks, streams and other low-lying and flood-prone locations are imminent or occurring. Expect areas with slow-flowing or stagnant water,” writes the Weather Service.

In Montgomery County, emergency managers responded to a person stranded early Saturday morning in high tide in Brookeville. Many local creeks and rivers are rising and will approach or exceed the flood stage.

In Fairfax County, overnight downpours caused Difficult Run at Wolf Trap to overflow its banks, flooding the Browns Mill Road, which was closed. High water also covered the two left lanes of the Belway at the American Legion Bridge. Floodplains were also reported on Prosperity Ave. in Merrifield, which was closed, and on Wiehle Ave. in Reston.

A flood warning is also in effect for the Monocacy River near Frederick, Maryland, where the water level has risen above the minor flood stage.

Although the heaviest downpours have already occurred, 0.5 to 1.0 inches of rain is still possible this afternoon, with the highest amounts in our northern areas. Remember not to drive on a flooded road as the water level is difficult to judge. Turn around.

On Friday, Dulles set a May 6 rain record with 1.18 inches and has received 1.68 inches through Saturday morning. Reagan National and BWI Marshall registered 1.88 and 1.86 inches for the event.

A somewhat subjective assessment of that day’s weather, on a scale of 0 to 10.

3/10: A lot like Friday, but cooler. Not great for early May.

  • Today: Periods of rain. Highlights: Mid to Over 50.
  • This evening: The showers are receding. Lows: low to mid 40s.
  • Tomorrow: A shower possible tomorrow, then mostly cloudy. Highlights: Mid 50’s.

We’re coming through the worst part of this storm system. Cold weather will peak this weekend, with daytime temperatures as low as 20 degrees or more below normal. The rain should subside for Mother’s Day, but it won’t feel like early May at all. I’m already thinking about the return of the sun early next week. It gets sweet.

Today (Saturday): It is humid and chilly for the time of year. We are increasingly in the cool air of this storm, so the rainfall probably won’t be as intense as yesterday. Still, some spots can go up another inch or an inch if the rain falls consistently enough. Temperatures don’t move much during the day as maximum temperatures tonight are likely to be around midnight. Diurnal readings peak in the low and mid 50s or so. Winds are from the east around 10 to 15 mph, with gusts over 30 mph. Confidence: Average

This evening: The showers continue into the night. It can usually be a drizzle, interspersed with some fog. The lows are in the low and mid 1940s. Winds continue to blow around 10 to 15 mph, from the east and northeast. Confidence: Average

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Mother’s Day (Sunday): On the plus side, most or all of the rain is done at sunrise. We could see a few showers lingering into the morning, but probably not many. Since the average high for the date is 75, temperatures struggling to get past the low 50s are quite cold. Most of the day is in the 40’s, with a breeze, so plan to need layers when you’re out. Some cloud breaks are possible before sunset. Confidence: Average

Tomorrow evening: There are probably plenty of clouds to start the night, but we should clear up with time. It’s pretty cool again. Temperatures drop to about 40 to 45. Some typically cold spots can reach the 30s. Confidence: Average

With a little luck the sun will make a comeback Monday† I say lucky, because the same storm plaguing us this weekend will linger off the coast in a somewhat unpredictable way. For now, partially sunny conditions seem likely, which should help temperatures rise to around 60 – still well below normal. Confidence: Average

It’s the same general story for Tuesday† The low pressure area should be far enough out from the coast to see a lot of sun. Temperatures go well into the 60s for highs, with some spots perhaps well above 70. Confidence: Average

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