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We present an updated three dimensional map of the Milky Way based on asample of 2431 classical Cepheid variable stars, supplemented with about 200newly detected classical Cepheids from the OGLE survey. The new objects werediscovered as a result of a dedicated observing campaign of the ~280 squaredegree extension of the OGLE footprint of the Galactic disk during 2018-2019observing seasons. These regions cover the main part of the northern Galacticwarp that has been deficient in Cepheids so far. We use direct distances to thesample of over 2390 classical Cepheids to model the distribution of the youngstellar population in the Milky Way and recalculate the parameters of theGalactic disk warp. Our data show that its northern part is very prominent andits amplitude is ~10% larger than that of the southern part. By combining Gaiaastrometric data with the Galactic rotation curve and distances to Cepheidsfrom our sample, we construct a map of the vertical component of the velocityvector for all Cepheids in the Milky Way disk. We find large-scale verticalmotions with amplitudes of 10-20 km/s, such that Cepheids located in thenorthern warp exhibit large positive vertical velocity (toward the northGalactic pole), whereas those in the southern warp - negative vertical velocity(toward the south Galactic pole).

Mapping the Northern Galactic Disk Warp with Classical Cepheids