UPDATE: We were lucky enough to have this storm caught on the AVHRR satellite this morning; My Buddy Scott [JessePedia] passed along this image - absolutely stunning.
That's one big (and intense) thunderstorm complex rolling through southeastern South Dakota this morning... below are radar, satellite and lightning maps from AccuWeather.com MapSpace™. The storm has prompted spotter reports of winds to 80 mph in Bennett county, with 75 mph in Davison County, though there was no Google News on the storm. The storm started in the middle of the state around 2-3 AM. Here's a radar shot at 7:40 AM Central Time:
Notice that the whitish color is literally "off the scale" -- it indicates a storm intensity of 75 dBZ, something rarely reached. Here are some shots from about an hour earlier:
There were plenty of lightning strikes...
Needless to say, a severe thunderstorm watch (yellow) and warnings (orange) were in effect.
The storm left a trail of high wind reports.
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I was watching a National Geographic thing on tornadoes and how they linked the sever out break this winter to the La Nina, cool onshore flow, which cause a stronger jet stream, which has been moving farther north, to cause stronger tornadoes. Could a stronger jet stream be causing these thunderstorms to be stronger? I feel the thunderstorms we have had around eastern PA have been stronger than usual with more hail.
FROM JESSE: Thanks for the question, I'll answer it in a blog entry later today.
Posted by Wadse | July 9, 2009 10:42 AM