Updated forecast: Showers and thunder wane into the night; heat indexes near 105 again Wednesday


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9:30 p.m. – Showers and rumbles waning through midnight

We finally got a real batch of rain into D.C. It passed relatively quickly, but we’ll take it amid the dry times of late. Other than a few isolated reports of wind damage near Laurel and Manassas, most storms ended up below severe levels.

Headed into tomorrow, we’re still looking at highs in the mid-and-upper 90s, along with increase humidity levels. It’s going to be rough out there. For details, see the forecast from earlier below.

Scroll to the bottom of the forecast for earlier updates…

Original post from 4:45 p.m. below

Do we say congratulations after five days of highs above 95? Probably not. Either way, it’s the longest streak of high heat since 2016, and it continues to push our crazy July to new heights. With all this heat and some humidity, plus a weak cold front draped across the area, the table has been set for storms. While it doesn’t look like there will be a big, severe weather event this evening, it is the start of a stormy few days. And it will be gross out again tomorrow. Surprise, surprise.

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Through tonight: Scattered showers and storms will move in from the west. They probably will arrive from 6 to 10 p.m. in the local area, traveling west to east. It could end up closer to midnight when rain will be totally done. Many spots won’t see much, but a few locations could pick up a quick 1 to 2-plus inches of rain, especially if storms travel over the same locations repeatedly. This could cause some localized flooding. Otherwise, it will be partly cloudy as temperatures settle across the 70s.

View the current weather at The Washington Post.

Tomorrow (Wednesday): The weather is going to be a lot like today, which is bad news if you don’t enjoy sweating instantly upon heading outside. The humidity will be back up, so heat indexes will be a real problem again. Heat advisories are likely, given that highs will reach the mid- and upper 90s. With dew points back in the 70s, heat indexes near and over 105 are a good bet at times.

Showers and storms are likely to roll off the mountains to the west by afternoon or early evening. Given more moisture, they could be more intense than Tuesday’s. Some severe weather, with wind damage being the predominant risk, will be a good bet.

See Matt Rogers’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.

Pollen update: Grass pollen and mold spores are low/moderate. Tree and weed pollen is low.

Stagnant air: It’s been a year of clean air so far in the immediate D.C. area, but this extended heat wave with very high temperatures is threatening to change that. If you notice a bit of a haze in the sky, you’re not imagining things.

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Earlier storm updates

8:30 p.m. – A new batch has blossomed locally

The severe weather risk should generally be waning. That said, some new storms have fired up over western suburbs and they are now moving into the District. Overall, this activity is less intense than earlier storms, but heavy rain and lightning continue to be widespread threats.

7:55 p.m. – Storms passing through the immediate area

The storm over northern suburbs has been warned. It may produce some hail to the size of quarters and isolated damaging wind gusts.

It made quite the scene as it passed D.C., riding an outflow boundary which gave it some brief shape.

..Scroll to the bottom for prior storm updates…

7:20 p.m. – Storms passing through the immediate area

The storm over northern suburbs has been warned. It may produce some hail to the size of quarters and isolated damaging wind gusts.

6:40 p.m. – Additional storms popping and moving east

The storm which was severe warned in southwest suburbs is on the move eastward. Places like Mount Vernon and Alexandria should get some briefly heavy rain in addition to gusty winds and lightning with this storm. A new storm may be developing near Great Falls to the north, as well.

6:11 p.m. – Isolated severe storm has developed locally

A severe thunderstorm warning has been issued for parts of Fairfax and Prince William counties until 7 p.m. A storm has rapidly developed over the area and could cause some damaging wind gusts as well as drop some hail to the size of quarters. Heavy rain may also become a concern due to slow movement.

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