Jeff Snyder
EF5
Texas Tech / West Texas Mesonet folks made a page with some damage pictures associated with extreme straight-line winds that occurred on the evening of 6/26 across western TX and far eastern NM. The page can be viewed at http://www.mesonet.ttu.edu/cases/Derecho_062607/06262007.html . The highlight is a recorded 98 mph wind gust and 65 mph sustained wind speed near Seminole TX.
Interestingly, invoking the EF-Scale, if we look at DI 25 - Free-Standing Tower, the expected value for a collapsed microwave tower (DoD 3) is 136 mph (116-160mph for LB-UB ), slightly less for DoD 2. There are a couple of pictures on TTU page above with the following description: "A large A-frame transmission tower failed and collapsed on a church in downtown Seminole causing significant damage to the church". There are a couple other pictures of a couple other antennae/towers that were damaged as well.
The picture shows what looks like DoD 2 for DI 21 - Metal Building Systems as well, with an expected wind speed of 89mph (75-108mph range).
Interestingly, invoking the EF-Scale, if we look at DI 25 - Free-Standing Tower, the expected value for a collapsed microwave tower (DoD 3) is 136 mph (116-160mph for LB-UB ), slightly less for DoD 2. There are a couple of pictures on TTU page above with the following description: "A large A-frame transmission tower failed and collapsed on a church in downtown Seminole causing significant damage to the church". There are a couple other pictures of a couple other antennae/towers that were damaged as well.
The picture shows what looks like DoD 2 for DI 21 - Metal Building Systems as well, with an expected wind speed of 89mph (75-108mph range).
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