#1183 Postby srainhoutx » Sun Dec 27, 2015 12:58 pm
Update from Jeff:
Powerful cold front sweeping in SE TX. Temperatures range from 46 at Caldwell to 75 at Crockett.
Cold front will move across SE TX this afternoon with numerous showers and thunderstorms as lift becomes maximized. Tornado threat thus far has not been overly aggressive with only one warning near the College Station area. Heavy rainfall is actually starting to become a concern as cells continue to line up in SSW to NNE bands and train. Some areas in Austin and Washington Counties have already picked up 1-2 inches in the last hour or so.
Severe threat including tornadoes will continue east of the cold front across the warm sector. Storms still struggling to break through and deepen over the warm sector, but any that do with like become tornadic quickly. Overall think instability is just not enough to really get things going, but we are heading toward the peak of whatever modest heating we are going to get today and that could be enough to bump those parameters up a little more allowing for more sustained updrafts.
Gradient winds really ramping up at midday with surface pressures down toward 29.60in and still falling over the region. Seeing easily gusts over 35mph at many sites and likely some gusting to 40mph. Winds behind the cold front are even stronger with frequent 35-40mph gusts and a dramatic temperature drop of 25-30 degrees.
Note: Initial rating of Rowlett/Garland Tornado….widespread EF 3 damage with pockets of EF 4 damage. This would be only the second EF 4 tornado in Dallas County since 1950. Prelim track 20-40 miles long with widths of 1/8th to 1 mile. It is possible the long track is multiple tornadoes from the same supercell. 11 fatalities with over 40 injuries and at least 600 homes damaged or destroyed. 8 fatalities were in Garland with at least 3 inside vehicles which were swept off I-30 at the George Bush Turnpike interchange on the west side of Lake Ray Hubbard.
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