We've lucked out the last couple of weeks with rain and heat relief because of the recent TUTT lows nearby. So today we will show what they are and how they are different from hurricanes?"
A TUTT low stands for a tropical upper tropospheric trough. It's basically an upper level low pressure system that cruises across the tropical regions and can bring the area some much needed rain during the summer months.
A TUTT low brings in tons of moisture and also colder air aloft. So when the air heats up, the air rises and the clouds bubble up into showers. As the air cools off near the ground at night the rain clouds collapse.
In a tropical system like a hurricane you see little change in temperature profile from near the surface to the upper levels. This lets tropical systems last for days along with its torrential downpours.
So the bottom line is that a TUTT low is an upper level feature that can only produce rain during the day. A tropical system is a low pressure near the ground which can produce rain 24 hours and stronger winds. Both systems contain lots of tropical moisture and bring in heavy rain and flash flooding.
In the past, TUTT lows have put big dents in droughts. We had a few in July 2007 which led to nearly 10 inches of rain. The last one occurred in June 2010.
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