Over secluded ocean waters, where upper-air observations are sparse, forecasters look at the motions of clouds to ascertain speed and direction of high-level winds.
32.
These roles were taken over by numbers 651 to 663 Squadrons of the RAF, the all-new Air Observation Post units working closely with the Army.
33.
The tunnel entrances were invisible to air observation and a French advance across the top of Mont Cornillet could be attacked from behind from them.
34.
Passengers sip beverages at their assigned seats, feast on gourmet cuisine in individual car dining rooms and watch the ever-changing scenery from open-air observation platforms.
35.
The period of dry weather and clear skies which began in early September had greatly increased the effectiveness of British air observation and artillery fire.
36.
Radar calibration duties were later carried out by the Hawker Siddeley Andover and Air Observation Post duties are today carried out by the Army Air Corps.
37.
The air observation duties, counter-insurgency and casualty evacuation roles performed by Auster and similar light aircraft were generally taken over by light helicopters from the mid-1960s.
38.
Meanwhile the British Generals are kept up to date by reports from artillery observers and air observations, allowing them to order re-bombardment of enemy held positions.
39.
In 1936, the WPA also funded a project that resulted in the compilation and analysis of millions of surface and upper-air observations taken from 1928 to 1941.
40.
The train has two dining cars with tables that seat two or four; it has two bar cars, one of which has a large open-air observation deck.
