"Flights have been spaced out a little more due to reduced visibility, causing some additional holding times," Mr. Awalt said.
Its attempt to cut through had to be called off soon after, due to poor visibility caused by the overnight build-up of snow and fog.
Calgary, Canada, awoke to its first major blast of winter last Tuesday, when 20cm of snow hit the city, leaving 15,000 people without power, and icy roads and poor visibility caused 170 accidents.
The winds are a bit of a concern for travel, but the real danger comes from limited visibility caused by the snowstorm – the drive out here involves crossing numerous hidden crevasses.
Invented by one of the creators of Apple's iPod, Nest Protect combines a traditional smoke alarm, which is triggered when it detects the poor visibility caused by smoke, with a host of other sensors including heat, light, activity and ultrasonic detectors and a detector for deadly carbon monoxide gas.
The start of the session was delayed by 20 minutes because of poor visibility caused by smog, which meant the medical helicopter was not able to take off.
Due to the environment of measurement, it has a high planting density of mango trees, at many points occurred loss of satellite visibility, causing GPS not providing an accurate measurement of geographical position.
Reduced visibility caused by airborne ash and the abrasion or cracking of vehicle windscreens are also common, and engine failure may result if vehicle air intake filters are not adequately maintained.
The lack of visibility caused injuries as men tripped and were trampled during the retreat through the marshes.
