Low wind speeds let air remain stationary long enough to take on the features of the source region, such as heat or cold. JetStream, Comments? The air of cold air masses is more dense than warmer air masses. There is another boundary that exists except this boundary divides moist air from dry air. • Once formed, air masses migrate within the general circulation. *Air masses are 3-D. Polar and Arctic air masses become shallower moving away from the source region. These raging, high rivers forced many people to be evacuated from their homes and their towns. Putting both designations together, we have, for example, a "continental arctic" air mass designated by 'cA', which source is over the poles and therefore very cold and dry. The motion of air masses also affects where a good portion of precipitation occurs. Credit: Flickr/Nurpu. Meanwhile far eastern Colorado will not see anything above the 40s this afternoon. Because the rain had to escape through the canyons in this mountainous area, every river in the northern foothills became a raging, destructive river. This is especially true north of warm fronts *Low pressure forces air mass movement. Where air masses converge, they form boundaries called "fronts". Western Colorado will not feel this front so it will be much warmer and dry west of the Continental Divide with 60s and 70s. With a cold front, a colder air mass is replacing a warmer air mass. Check out When disaster strikes to learn what you can do to be prepared. Putting both designations together, we have, for example, a "continental arctic" air mass designated by 'cA', which source is over the poles and therefore very cold and dry. On September 12, 2013, Boulder, Colorado received nearly ten inches of rain in one day. DENVER (CBS4) – Colorado is split down the middle today with two different air masses in place. Warm air can hold a lot more water than cold air. Warm fronts typically have a gentle slope so the air rising along the frontal surface is gradual. Arctic air masses, designated by the letter 'A', are very cold as they originate over the Arctic or Antarctic regions. By viewing our video content, you are accepting the terms of our. It’s all thanks to a cold front that moved in from the north and east overnight. An air mass is a large body of air with generally uniform temperature and humidity. Warm, moist air from the south moves into Colorado infrequently, but most often in the spring, summer and early autumn. Credit: Colorado National Guard photo by Sgt. A truck is surrounded by floodwater in Boulder County, Colorado. DENVER (CBS4) – Colorado is split down the middle today with two different air masses in place. Polar air masses, designated by the letter 'P', are not as cold as Arctic air masses as they originate over the higher latitudes of both land and sea. The arrow shows the approximate location of Boulder, Colorado. The area over which an air mass originates is what provides its characteristics. The flow around this system sucked the extremely moist air from the south into the northern Colorado foothills. The slope of cold fronts, being much more steep forces air upward more abruptly. There is also a stationary front, which, as the name implies, means the boundary between two air masses does not move. We may have another strong cold front arrive by Friday and it may keep cooler weather in place for the entire upcoming weekend. As such, air masses are associated with high pressure systems. As this air is carried northward and westward to higher elevations, the heaviest and most general rainfalls (and sometimes wet snows) occur over the eastern portions of the State from April through early September. Snow Totals, Colorado Weather: Potent Storm Prompts Winter Weather Alerts For Entire State, Snow Helps Slow Spread Of East Troublesome Fire, Snowstorm Brings Critically Needed Moisture To Colorado, Draft Horse, Donkey Released During Wildfire Found 'Singed And Hungry, But Healthy', Snowy Roads And Highways Plagued With Crashes Sunday; CDOT Urges Drivers To Stay Home Monday, Seven First Responders In Grand Lake Lose Homes To East Troublesome Fire, Denver Weather: Arctic Blast With Snow And Record Cold On Sunday, East Troublesome Fire Activity Slowed By Snow, Firefighting Crews Presented With New Challenges. National Weather Service Credit: Flickr/Nurpu. Jonathan C. Thibault. The longer the air mass stays over its source region, the more likely it will acquire the properties of the surface below. Equatorial low-pressure trough: This area is in the Earth's equatorial region (0 to 10 degrees north and south) and is composed of warm, light, ascending, and converging air.

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