Keywords: Symbol code ww 18.svg Codes 10-19 General Group No precipitation at the station at the time of observation or except 17 during the preceeding hour <br />Code 18 <br />Squall s within sight during past hour according to http //www srh weather gov/srh/jetstream/synoptic/ww_symbols htm US National Weather Service - Southern Region Headquarters 2009-05-17 w cs User -xfi- PD-USGov-NOAA image Symbol code ww 10 svg image Symbol code ww 11 svg image Symbol code ww 12 svg image Symbol code ww 13 svg image Symbol code ww 14 svg image Symbol code ww 15 svg image Symbol code ww 16 svg image Symbol code ww 17 svg image Symbol code ww 18 svg image Symbol code ww 19 svg Weather map symbols Down arrow symbols Black arrows |