Johnson City Record Courier
Weather Partly Cloudy 84.0°F (41%)
County Gets Much-Needed Rain
Burn Ban Remains
Thursday, October 13, 2011 • Posted October 13, 2011

Blanco County got some much needed and much welcomed rain Saturday and Saturday night.

An upper level atmospheric low pressure system reacted with deep moisture throughout the atmosphere to bring us scattered showers and thunderstorms. The upper level jet stream position made diffluence favorable.

Diffluence is an air flow pattern where wind direction diverges along an axis parallel to flow along that axis. It’s a form of divergence, where two air currents move away from each other. The weather balloon launch showed that the atmosphere had a lot of moisture to lose (in the form of rainfall). These factors combined increased the chance of precipitation for the area, especially over the Hill Country. Convection (excess water vapor in rising air parcels condensing to form a cloud) continued across south Texas overnight into Sunday morning as an upper level weather disturbance tracked northeast, making showers and thunderstorms more numerous west of highway 281.

When all was said and done, Blanco County received between 1 to 3 inches of rain and a few good thunderstorms.

The second weather system moved east of the area on Monday, leading to a decreased chance of precipitation Monday (only slight chance of rain) into Tuesday as a bit of leftover moisture lingered in the atmosphere.

As great as the rain was, it looks like it may be the last rain we see for a little while, as ridging (upper level atmospheric high pressure) moves into the area, bringing with it temperatures a bit warmer than average and dry air with no chance of rain.

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