We’ve done it. We’ve hit 90 for the first time this year at Reagan National Airport, and we may very well do it at least one more time before the holiday weekend is done. An isolated storm could bubble up in the hot and humid air through tonight, but the better chance of storms comes later tomorrow.
Through Tonight: Can’t rule out an isolated thunderstorm with the best chance in the western/northwestern suburbs (furthest away from high pressure off the coast; further west, west of Frederick/Loudoun /Fauquier counties, there’s a Severe Thundersorm Watch). Otherwise skies are partly cloudy and the air is warm and muggy with lows mainly in the upper 60s to low 70s.
Tomorrow (Friday): Partly sunny skies give way to a pretty decent chance (60%) of scattered afternoon into evening storms - some could be severe - as energy from the system that’s been battering the central U.S. arrives around the same time highs are reaching the mid-80s. Breezes from the south around 10 mph don’t do much to cut the humidity.
Pollen update: Walter Reed says, “Grass pollen is MODERATE at 10.86 gr/cubic meter (NAB range) which is High for our area grass counts. Tree pollen at 12.14 gr/cubic meter is LOW (NAB range) but more moderate for our local area count. Weed pollen is LOW at 1.92 gr/cubic meter and mold spores are in the MODERATE range at 9906.65 spores/cubic meter.”