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Isolated thunderstorms have developed this evening in our western suburbs, with more widespread activity towards I-81 and the mountains, some severe. Only scattered showers and storms will make their way east overnight, but more widespread activity is likely Thursday marking the final day of this warm, humid air mass.

Through Tonight: Most storm activity hangs out towards the mountains this evening, but a few scattered storms trickle into the immediate metro region, with the western suburbs having the best odds (40 percent) of getting wet (30 percent elsewhere). Later at night and towards morning, chances increase some (to 40-50 percent) that more widespread showers and storms move into the region. It’s a mild night, with lows 65-70.

Tomorrow (Thursday): Showers and thunderstorms are likely, especially from the late morning on into the afternoon. It’s not a washout, but some locally heavy downpours are possible at times. Some occasional peeks of sun are possible in between rain activity, with highs in the low 80s. And yes, it’s quite humid and breezy, with winds from the south around 10-20 mph.

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

Bob Ryan’s last TV broadcast: Tonight at 11 p.m. is meteorologist Bob Ryan’s last TV weathercast on WJLA, D.C.’s ABC affiliate. WJLA is planning quite the send-off, so tune in. Here are some fun links posted on the WJLA website pertaining to Ryan’s farewell: Bob Ryan retiring after 33 years of TV weather forecasting | Barbara Mikulski sings Bob Ryan a farewell | Bob Ryan retiring: Tweet your memories and best wishes with #FarewellBob | Bob Ryan: A lifetime of weather

See also my tribute to Bob: Bob Ryan’s retirement: sunny days remain for legendary forecaster