SYNOPSIS FOR: 04/09/94 - VORTEX-94 A strong wind max , pushing southeast from the Pacific NW, was carving out a significant trof over the southwest U.S. The negative tilt trof was beginning to develop a closed center over Nevada by evening. Shortwave energy, moving through the mean trof, began to move out over the Plains during the day. A first shortwave triggered early morning convection over KS and northern OK. The KS portion of the convection, north of an east- west frontal boundary, continued all during the day. During the day, a surface cyclone deepened over the northern TX Panhandle and a strong dryline developed southward . Large amounts of low-level moisture moved northward from TX and mid-60s dew points covered the central 1/3 of OK by early afternoon. A second shortwave approached the cyclone area from NM by early afternoon. This wave was associated with a significant tropospheric jet streak that ran from AMA to east of DDC by evening (> 100 kt at 300 mb). To the south of the jet streak (in the warm sector of the cyclone) a strong mid-level cap developed. As the dryline accelerated eastward into western OK and the triple point moved into northwest OK, convection formed along the warm front as it retreated northward into southern KS. Some of the early convection formed to the northwest of the surface low where moisture was being advected westward. The first tornadic storm/supercell, and the one that produced the most destructive tornadoes, formed near LBL and moved to SE of DDC, and eventually to near ICT. Two other tornadic storms/supercells formed northeast of the triple point and moved easxtward to southeast of ICT., just north of the warm front. Significant deep convection failed to form along the dryline during the daylight hours because of the strength of the capping inversion. The shortwave/jet streak ,passing by to the north, failed to provide the lifting that would have been necessary to break the cap over OK.
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