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* Flash flood watch tonight through Thursday morning *

11:10 p.m. — Flood warning for the District and areas to the southwest through 5 a.m.

Very heavy rain has set up in a corridor from around Charlottesville into the District, triggering flood warnings. One to three inches have fallen (with the heaviest amounts in central Virginia) and another 1 to 2 inches are possible as heavy rain continues for several more hours (rainfall rates may average about 0.5 inches per hour during this time, with brief bursts in the 1 to 2 inches per hour range), progressing from southwest to northeast.

Zones most prone to flooding are near small streams and creeks, and low-lying, poor drainage areas. Do not attempt to cross a flooded roadway in your vehicle. Turn around, don’t drown. One instance of flooding has already been reported near Oakton.

It’s possible the flood warnings in effect, shown below, could be expanded north and northeast overnight.

Rainfall totals of 2 to 4 inches are likely, with locally heavier amounts possible.

Original forecast

In between great stretches of autumn weather in recent weeks, we’ve had several all-day rainstorms to break the monotony. Today was yet another as steady rain deposited 0.5 to 1.0 inches through late afternoon. The rain could not hold back the warmth, however, with temperatures rising to near 70 degrees. Normal highs are right around 60. It will turn cooler on Thursday as the rain gradually moves away.

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Through tonight: It will be a muggy and warm evening into the overnight. Although showers may ease for a time this evening, heavy rain will become more likely again as we get into the night. Any rain may increasingly lead to some flooding, as well. Lows will eventually dip to the low 60s or near 60 in the predawn hours, but readings could begin to fall off more significantly toward dawn. Given the warmth overnight, we’ll probably set Thursday’s high temperatures just after midnight.

View the current weather at The Washington Post.

Tomorrow (Thursday): With the cold front passing early in the morning, a more seasonable airmass is moving into town. Daytime readings will probably fall through the 50s as rain continues through the morning. That rain should tend to shift south and southeast with time, and intensity will lower a good deal by afternoon. Winds will be whipping up out of the north a bit, so it’ll certainly feel more like November than it has recently.

See Dan Stillman’s forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter and Instagram. For related traffic news, check out Gridlock.

Rain totals: Through 4 p.m., rain totals were approaching an inch in spots. Plenty more is on the way. In D.C., 0.75 inches has fallen. Dulles has picked up 0.91 inches. Farther north, BWI has tallied 0.65 inches thus far. Totals as high as about three to four inches are possible, especially near Interstate 95 and to the southeast.

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