Archive for March, 2013

How we built our storm chase vehicle

Posted: 31st March 2013 by Jason in Gear

While ST1 doesn’t always chase together, when we do we have the luxury of driving around in a dedicated chase vehicle.  In 2011, I took my 2006 Ford Freestyle AWD daily driver and started bolting junk onto it in the hopes of getting just a little bit closer to a storm without losing the windows.  […]

The groundhog lied

Posted: 22nd March 2013 by Jason in Winter Weather

So it looks like our friend the groundhog has taken a job in Washington.  The National Weather Service has put St Louis and the surrounding areas on alert for a late season winter storm that could be 8 inches of snow or more locally.  Expect rain Saturday turning into snow Saturday night and all day […]

What’s a Skew-T, part 7

Posted: 8th March 2013 by Jason in Tutorial

In this final tutorial on Skew-Ts, we’re going to put everything we’ve talked about together.   We’re using the same Skew-T that we’ve been talking about since the start, but now we have enough information to identify, at least partially, if our storm has some of the ingredients that it needs in order to make you […]

What’s a Skew-T, part 6

Posted: 7th March 2013 by Jason in Tutorial

Here is a Skew-T that has had some environmental data pasted into it.  Everyday balloons are sent up that take various measurements at specific levels of the atmosphere, two of them being temperature and dewpoint. What you are looking at here is essentially the result of a balloon with a thermometer and a hygrometer being […]

What’s a Skew-T, part 5

Posted: 6th March 2013 by Jason in Tutorial

The wet (or sometimes called moist) adiabat is a dashed line on the Skew-T that starts at the bottom of the graph and, depending on the starting temperature, wiggles it’s way towards the north west or north east.  The wet adiabat is very similar to the dry adiabat, but the rate of temperature change is […]