Keywords: Squall line.png en How a squall line is dipcted by the NWS on weather maps 2014-05-28 23 34 31 http //www wpc ncep noaa gov/images/squall_line2 png Image of the page http //www wpc ncep noaa gov/html/fntcodes2 shtml Product Legends Weather Prediction Center of the US National Weather Service PD-USGov Uploaded with UploadWizard Atmospheric front symbols Squall lines |