An air mass entering Alaska from the northern Pacific Ocean would most likely be labeled on a weather map as

(1) cP (3) mP

(2) cT (4) mT

i think the air mass would be very likely to be labelled as : 2. cT cT air masses originated over mexican plateau region and desert SW. The air usually hot, dry, unstable at low levels and stable at upper levels cT and mT air will often create a boundary that is called a dryline