Rain, rain, don’t go away!July 14th, 2012 at 11:38 pm by David Mazza under Weather
Another day, another shower and t-storm! Yes, that’s right more showers and t-storms again for Saturday. The heaviest rainfall came across parts of Fayette county. La Grange picked up more than 1.5″ of rainfall today from a slow moving shower. Tonight we saw more showers and t-storms pop-up right around sunset and as I am writing this, they are still firing in some areas. We have some small t-storms near Round Rock, Burnet, and Cedar Park, Driftwood, Bastrop, and near Rosanky. There is a pretty strong line of t-storms moving into far southern Hays County including San Marcos and Kyle is getting some rain as well.
What causes this rain? Well lots of things. Mainly we have had an upper level low that has been super slow to move out of our area the last week. It was in Louisiana about 8+ days ago, and then drifted to the west early this week focusing the best areas of rain and t-storms near our area from Monday-Wednesday. The upper low moved back to the east for the 2nd half of the work week and lessened our rain chances a bit. Now this weekend the upper low is stretching out a bit and starting to move west. One of the big issues for heavy rainfall has been the lack of air movement. The winds have been very light from the surface on up and this has provided very little steering for most of the showers and thunderstorms, and really no push to move them. Another issue is the remnant boundaries from the rainfall that we have see all week long are providing small focus areas for rain and thunderstorm development. Especially when the boundaries intersect like they are doing this evening.