This map depicts the current weather conditions for the 12th of February 2015. On this day there were two large cold fronts followed by a stationary front, and an occluded front on the upper east coast. The highest winds were located on the east side of the Rocky Mountains and inland of the South East United States. Low pressure followed the cold fronts while high pressure surrounded the stationary front over the Rockies.
This map shows the number of air masses in the US. Air masses control large areas of land with their uniform temperature and humidity characteristics. The small letter (c or m) relates to the moisture content while the large letters (P A T or E) deal with temperature. The continental polar mass is the reason the Midwest has such cold and dry winters.
According to this map, the Oregon and Washington coasts are experiencing haze. The temperatures range in the 40s and 50s and the pressure is low. The winds are calm nearer to the coast (3-8 mph) but increase further inland (more in the 20-25 mph range).
This map of the Midwest shows that much of our area is overcast and some areas in central Wisconsin are experiencing light snow. The winds are lighter here (9-14 mph) but increase as you go south (21-25 mph). The temperature ranges in the mind-teens to mid twenties, but extremely frigid air is expected tonight and tomorrow. The pressure is currently low.
The graphic shows the storm that is currently moving through the mid-southern states and will be bringing a lot of ice and headaches for driver's commutes.
Winds are coming in from the north and spreading west to east across the United States today. The isobars are especially close together so the winds are pretty strong in most parts of the country except for a slight lull in the prairie states and most of Arizona.
The water vapor trail across the United States matches with the current jet stream trajectory. The lightest areas on this map correspond with predicted and current snow fall in the mid-southern states.
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