Tuesday, February 28, 2012

2/28/2012

I will try to update this post frequently throughout the day tracking the "ominous" storm that should arrive this evening. I will basically be noting the cloud types and also the wind direction and barometric pressure throughout the day.
10:00 a.m. - The wind is out of the SE at 7 mph and the barometric pressure is at 29.20 in. Temperature is 30°F and cloud cover is 100% with what looks like stratocumulus clouds. Notice the large area of low pressure forming in Colorado often referred to as a Colorado low. This pressure system will make its way over the High Plains and Midwest before moving into the NE. If the front slides to the north of our area, we will be getting mostly precipitation in the form of rain. If it goes to the south, we will be in a colder air mass which means that we will be getting precipitation in the form of snow. *New video posted in the Weather Videos link.*


5:00 p.m - It has just begun to snow about an hour ago and it is a very wet and heavy snow as temperatures are just below the freezing mark. The wind is still out of the SE @ 10mph and bringing moisture with it and will override and mix with the cold air pocket that we are sitting in right now. These are the main ingredients for precipitation to form and that is what is happening right now and will continue to happen as the big low pressure system moves up through Nebraska.


7:00 p.m. - The precipitation has changed from heavy wet snow to a freezing rain that is coming down pretty heavily right now. Temperature is sitting at 31°F right now as the winds are bringing in warmer moist air from the SE. Here is an Infrared photo which shows cloud temperatures and heavy precipitation will show up in a dark cyan.

10:00 p.m. - Take a look at how fast the barometric pressure dropped in a 24 hour period. It's pretty cool to see it take a sudden drop right about the time the system moved into the area. The low pressure system is right underneath us and pushing north. Remember that with a low pressure system, the winds blow inwards in a counter clockwise fashion. Note the isolines on the map and notice the winds are strongest around this front.
Daily Barometer Graph





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