Playing With Thunderstorm Outflow Boundaries
Posted by Jeff Gammons on 12 Apr 2007 at 11:15 am
Tagged as: Florida Weather, Storm Photography
Last nights thunderstorm complex that moved in from the Gulf of Mexico and produced some severe weather reports in Central Florida, put out a impressive outflow boundary. This boundary came to rest over Southern Florida early this morning and this is where I sat awaiting the next line of storms that was moving in from the Ft Myers area. This boundary was draped from just south of Ft Myers to about West Palm Beach. As you can see in these photos, the outflow boundary was well developed. I love a good boundary like this, as it’s a good focal point for future thunderstorm development later in the day. Or, if you can get a ongoing storm to interact with the boundary, magical things can happen.
As the thunderstorm complex from southwest Florida moved in over the Everglades this morning, it did interact with the southwestern end of this boundary and the line of storms pulsed up for a good 30-45 minutes while moving into Western Dade and Broward counties. I didn’t expect anything more and some strong straight-line winds and maybe some small hail. Was working with a unidirectional wind flow today, so no good storm structure for you.
One thing that was very cool is, when I crossed the boundary heading south, my dew point jumped from the upper 60s to the lower 70s within a few miles. Moisture was pooling south of this boundary and a area of fog developed. I lost the rest of the storm as it headed over the central Everglades and marsh lands. Overall a fun morning hanging out with a boundary, that came from my evening of chasing last night 150 miles further north.
Going to get some food and rest for a few hours. Cold front slowly moving down the state now. Possible slight chance of a thunderstorm southeast coast this afternoon, but drier airs in already filtering into the mid and upper levels, and the surface flow is westerly now. All one can hope for is another boundary called the sea breeze 3:00 pm magic.
I’ll be monitoring…

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Glad to hear you got some chasing in as well as much needed rain. I watched that complex yesterday and it really just blew up in no time. The radar return was much more ominous then the actual storm. If this would have been summer it could have been a 4-5 inch rainfall but as it turned out I got .47. It was nice to hear thunder and see the light show before bed.
They are forecasting the next front for Sat night Sun morning. Things appear to shaping up for decent squall line. Woopi!
Thanks Dave - Yeah the next system looks to have a nice punch to it. Will have a better handle on it come saturday. Looks like a nice Nor Easter will affect the east coast over the weekend into monday.
I’m sure I’ll be chasing in north-central Florida on sunday.
I’m working in sw georgia, but live in mississippi where one of my hobbies is serving as coop observer in my home town of cleveland.
I read JAN forecast discussion this a.m. and it looks like a fireworks show will pass quickly through the state on its way here by Saturday night.
I just found this site and find it interesting.