WEATHER GIRL “Partly Cloudy with a 90% Chance of Total Meltdown,” reads the humdrum but marketable tag line of writer-director Blayne Weaver’s humdrum but marketable comedy, starring a handful of humdrum but marketable faces from the small screen. In the first five minutes, Seattle morning–TV’s inexplicably referenced “sassy weather girl” Sylvia Miller (The New Adventures of Old Christine’s Tricia O’Kelley, who also produced what reeks of a star vehicle) freaks out on-air over the infidelity of her clueless, megawatt-smiley anchor boyfriend (Mark Harmon). Meant as a pivotal, plot-igniting moment, the sequence stumbles out of the gate as the first of countless stagey misfires — it’s quirky-funny like a sitcom, not a Zooey Deschanel movie. Unable to score another broadcasting gig after committing career hara-kiri, Sylvia moves in with her smug slacker bro (Ryan Devlin) and faces the existential storm of being a single, 35-year-old woman (enter Jon Cryer’s cameo as an awful blind date) until true love arrives as earlier telegraphed. O’Kelley performs with the confidence of an embittered Sex and the City girlfriend but more closely recalls the broad hysterics of a Cathy comic strip. Ack! (Sunset 5) (Aaron Hillis)