Although temperatures today warmed a few degrees compared to yesterday, it actually felt cooler due to modestly lower humidity levels. Today’s peak heat index values ranged from 100-103 compared to 103-105 yesterday. Tomorrow, the downward trend in humidity continues and temperatures step down a few degrees too. The big drop in humidity arrives tomorrow night, but we may have to get through some showers/storms first.
Through Tonight: Skies are mostly clear but you won’t notice much relief from the mugginess yet. With dew points area-wide in the upper 60s, that serves as the bottom for minimum temps in the cooler suburbs, whereas downtown D.C. can only manage the mid-70s.
Tomorrow (Wednesday): Full relief from the heat still isn’t here. The morning is steamy, and afternoon temps reach the low 90s with heat indices in the mid-to-upper 90s. Between mid-afternoon and early evening, there’s a 30-40% chance of showers and thunderstorms as a cold front moves through. After that front moves through, you should notice drier, more comfortable air steadily flowing in.
Pollen update: Grass pollen is LOW (NAB range) at 4.15 gr/cubic meter which is more moderate for our local area count. Tree pollen is LOW at 1.6 gr/cubic meter, weed pollen is LOW at 3.83 gr/cubic meter and mold spores are in the HIGH range at 22751.78 spores/cubic meter.
Jim Cantore: Today marks meteorologist Jim Cantore’s 25th anniversary at the Weather Channel (TWC). TWC has posted a video in which Cantore reflects on his career. The network will honor him on-air at 7 p.m. tonight.