Thunder-storms began to develop late afternoon early evening along a well defined dry-line in the eastern sector of the Permian Basin, along the southern said boundary, associated with an intense Upper Level Low centered in the central Rockies. The Upper Level Low and associated short wave troughs broke down an entrenched Upper-mid Level High which had controlled the weather across the Permian Basin for several days with above normal temperatures, exceeding the century mark. Low level moisture was present early in the morning and early afternoon hours, extending into the central Permian Basin but was gradually displaced eastward by strong westerly winds mixing downward from the base of the Upper Level Low, advancing from the western US. At 2000Z the author drove to Big Spring awaiting dry-line initiation where cumulus clouds had developed along the dry-line but mid level capping inversion was still in place preventing storm tower growth. The first image is a screen capture from the truck at previously mentioned locale depicting surface winds and defining dry-line with intersection of same and SPC depicting thunderstorm probability east of Midland. After watching the dry-line locale with cumulus cloud development for one hour, with no storm tower development, the author had to return to Midland. Later in the evening storm tower and organized cell development occurred. The next image was taken at 0115Z in a parking lot in Midland looking east-northeast at dry-line induced convection.
The next image is a zoom of storm tower growth. 
The next image is radar capture of dry-line initiation represent-ing the previous photo-graphs delineating the northeast aligned, parallel to dry-moist boundary, eruption. 
The next image is a regional radar capture of storm develop-ment along dry-line with surface wind convergence overlay.
The last image is a radar regional view of previous but showing 24,000 ft winds aloft, denoting 60 knot energy, rounding the southern periphery of the Upper Level Low overlapping with the surface to 850MB level dry-line boundary.
No comments:
Post a Comment