Post
by taugust » Thu Sep 10, 2009 11:30 pm
I was watching your storm as it happened from Cuyamaca. I watched it develop on radar and outside. It was an amazing storm from my perspective as well. It started south of Ocotillo Wells and remained almost stationary, but grew to immense size. The cloud top rose up and spread out in the classic anvil shape, but spread until it was overhead in Cuyamaca, 29 miles away from the center at about 5:34 pm.
Attached is a photo taken from my house, looking southeast toward Mt. Laguna. You can see mammatus cloud shapes (the puffy pouches hangin from the underside of the cloud). This indicates extreme instability and downward motion from the cloud. You can also see the gust front. This is the diffuse cloud at the ground level at the horizon. This is from the downrush within the thunderstorm hitting the ground and spreading out. This approached and finally arrived at our house about 15 minutes later, blowing about 35 mph. It was very cool and humid, but no rain fell. What was interesting is that gust front came from that roughly 30 mile distance and came up the eastern slopes of the mountains from an elevation of 170 ft. at OW to 4880 ft. at our house. I saw in the NWS severe thunderstorm warnings that I was getting that the outflow boundary on the eastern side was causing 50 mph winds and dust storms.

- DSC_5575Low.jpg (60.36 KiB) Viewed 2211 times
Tim
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