The exact date for this information is unknown but it may be 1954.
| Air Mass | Source Region | Clouds | Ceiling | Visibility | Turbulence |
| cP | From Canada | Scattered afternoon CU | Unlimited except in or before showers | Good; a few patches of fog | Moderate up to 10,000 feet in afternoon |
| mP | From the Pacific over the Pacific coast | ST, tops 2000 ft to 5000 ft, frequent at night | 100 ft to 2500 ft unlimited during day | Poor, especially at night | Slightly rough below and in clouds, smooth above |
| mP | From the Pacific east of the mountains | Scattered afternoon CU | Unlimited | Excellent | Generally smooth except in lowest layers in afternoon |
| mP | From the Atlantic | Broken to overcast SC | 800 ft to 2000 ft | Good | Light below clouds |
| mT | From the Gulf and Atlantic | ST or SC in early morning; CU and CB in afternoon | Morning 500 ft to 1500 ft; afternoon 2000 ft to 4000 ft | Excellent except below clouds in early morning | Smooth in early morning, rough in afternoon |
| cT | From Mexico and the Southwest States | None | Unlimited | Excellent | Smooth in early morning, rough in afternoon |