I warned about “debris clouds” from storminess in the broader region in yesterday’s PM Update, then went ahead and forecast temperatures on the high end of expectations. We still learn and relearn forecast lessons as we go. Happily, it was one of those times where a cloud deck hanging on into early afternoon was a good thing. As soon as it departed, temperatures ran to near or above 90, and it felt gross. Highs ended up a little cooler than expected but still hot. And now we watch the chance for some storms through the evening.

Through Tonight: A cluster of thunderstorms that formed over the higher terrain to the west and northwest is entering western parts of the area. There’s a good shot to see it cross from west to east, impacting many locations with some quick rain, gusty winds and dangerous lightning. While it’s a fairly unbroken line at this update is published, it’s also a smaller batch with some segments. In other words, hit or miss is the likely outcome. Isolated damaging winds are possible, but this is a fairly low-end severe weather threat, as far as they go. Showers and storms should be ending or moving away by sunset. After that, skies are partly cloudy with lows settling into the low and mid-70s.

View the current weather conditions at The Washington Post.

Tomorrow (Wednesday): We should see less in the way of cloud cover overall, although I wouldn’t bet too strongly on that. Once again, the best odds for sustained cloudiness are probably early in the day, and there could be a shower or two, especially north. The pattern isn’t much different than today. So while it’s still to be determined how much impact the clouds  may have, there’s no reason to expect it won’t be hot. Low to mid-90s seem like a good bet for now. If it looks like we end up with fuller sunshine levels, we could be talking mid-90s everywhere. Winds are out of the west around 10 mph.


A man does a backflip off a diving board at Banneker Pool in Washington on July 11. (Calla Kessler/The Washington Post)

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 Dr. Gridlock.

Pollen update: Mold spores and grass pollen are low/moderate. Tree and weed pollen are both low.

Weather terms: Ever wonder where key weather terms come from? Stuff like derecho, avalanche and hurricane? AccuWeather breaks it down.

Want our 5 a.m. forecast delivered to your email inbox? Subscribe here.