University of Tennessee at Martin Meteorology

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Heads up to our Meteorology Students

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The front has passed through! The graphic on the right shows the abrupt shift from southerly to northwesterly winds and the graphic on the right (especially the top graph) shows the drop in temperature about 8 degrees in 15 minutes!

The Great Tornado Hunt of 2019 has concluded with our intrepid tornado chasers returning early this morning. Bagged a few twisters before heading home. Glad everyone got home safely! Photos to follow...

The Fahrenheits fell today in a big way...from 56 to 32 in about 6 hours. (Times in UTC on the graphs and Eastern Time on the side, even though we are in the Central time zone.)
Moderate snow in Martin as we speak!

University of Tennessee at Martin Meteorology The meteorology concentration at UT-Martin prepares students for careers in weather forecasting, climatology, research, and broadcast meteorology.

Get this...the forecast track for what is now Tropical Storm Michael is nothing short of unbelievable. According to the National Hurricane Center it is forecast to be a sub-tropical storm all the way to nearly Europe and finally get to depression status in the Bay of Biscay! By Monday! The transition to extra-tropical phase (post tropical, subtropical, call it what you will) has begun. Whether this holds true or not remains to be seen, but just even thinking about this possibility underscores how unusual Michael really is.

So we had a lot of water yesterday, in the morning. Driving to Kenton, I noticed that the river was extremely high and raging and I wondered why. I didn't think there was that much rain that fell in the morning. Well, the storms we got in Martin, which garnered an inch of rain wound up producing from 2 and a quarter to nearly 4 inches of rain in Fulton, Kentucky, in Hickman County. As the first two graphs show, one from the automated station here on UTM's farm and the other from the Kentucky Mesonet, it is clear that the rain was pretty intense and ramped up quickly. Well, all of that water has to go somewhere and the "wave" of water that was recorded at the Obion River hydrograph station (the third picture) and can be found on the National Weather Service Website, is pretty evident! The moral of the story - flash flooding is really a big deal - because the water can rise very rapidly as this hydrograph showed and it will take longer to leave the river than it will take to enter it!

Analysis | This mesmerizing storm makes it look like a bomb went off in Memphis last night It's not a bomb, just thunderstorm winds spreading out across western Tennessee in a near-perfect circle.

Wind Rose time....This is what you get when you have a cut-off low for about three days! The first image is the wind rose from UTM's weather station. The second is the upper-level cut-off low spinning over the area. Since the surface low is slightly to our east, it stands to reason that the stronger winds are coming from the north-northwest as the air rushes in to fill in the low.. But, outside of that the wind-field over time almost looks like a circle...all points of the compass represented!

Happy New Year! And what a cold start to 2018 this has been. While the temperatures have been outrageously cold as shown in the temperature graphs, note also the pressure. Frankly, pressures like this are kind of rare for our neck of the woods. 1040.55 (30.72 in of mercury) Owing to the ideal gas law, if pressures are high and densities are high, temperatures are going to be necessarily low. The air is so cold, the molecules in it slow down, gravity takes over, and thus all of those molecules are crowded near the ground making for high densities. Since the molecules are moving, albeit slowly, when you add up all of their colliding around - and call their collective impacts pressure - then you get really high pressure.
The weather map reveals that we are under an area of high pressure with a value of 1050 mb (an amazing 31 inches of mercury). That's more than an inch higher than standard sea level pressure of 29.92 inches. This also means that the amount of moisture in the air can't be that high either, because there's not much room for additional molecules of water v***r in an air mass that dense. Hence, the v***r pressure at the dewpoints we have now is around 1.5 mb - of the 1040.55 mb of pressure, only 1.5 mb of it is accounted for by water v***r molecules. Though the relative humidity looks high (69%) it is not an accurate measure of how moist the air is. Clearly, we are looking at a high pressure area with a very dry, cold, dense, air mass.
All of this is a fancy way of saying bundle up! The whole week is going to be like this! Enjoy!