As the low pressure system moves in from the west / northwest .. it is pulling cold air to the south.. also.. the southern arm of the system is pulling warm air up from the south.. mixing in North Texas.. producing tornadoes / tornadic cells.
here is the video:
Here are links to several RADAR and Satellite systems so you can monitor the situation in your specific area:
http://www.intellicast.com/Local/WxMapFull.aspx
http://radar.weather.gov/Conus/full_loop.php
http://weather.cod.edu/satrad/index.php
http://www.intellicast.com/Local/WxMapFull.aspx
http://www.eldoradocountyweather.com/satellite/ssec/world……
http://squall.sfsu.edu/crws/archive/satimgs_month_arch.html
http://wdssii.nssl.noaa.gov/web/wdss2/products/radar/rcon…
http://www.srh.noaa.gov/srh/tropicalwx/satpix/nwpac_ir4_l…
http://www.inmet.gov.br/html/observacoes.php
http://weather.rap.ucar.edu/radar/
http://www.srh.noaa.gov/oun/enhanced.php?map=2
http://cirrus.sprl.umich.edu/wxnet/radsat.php
http://vortex.plymouth.edu/nids.html
http://weather.utah.edu/index.php?runcode=2011071812&……
http://www.atmos.washington.edu/weather/radar.shtml
http://www.stormsurfing.com/cgi/display_alt.cgi?a=glob_250
http://www.weather.com/maps/activity/aviation/tuesdayusje…
http://weather.engin.umich.edu/wxnet/servers.php
http://www.woweather.com/cgi-app/satellite?CONT=usus&…