Mesoscale Discussion 727 http://www.spc.noaa.gov/products/md/md0727.html

MESOSCALE DISCUSSION 0727 NWS STORM PREDICTION CENTER NORMAN OK 0119 PM CDT MON MAY 20 2013 AREAS AFFECTED...CNTRL TX CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 201819Z - 202015Z PROBABILITY OF WATCH ISSUANCE...95 PERCENT SUMMARY...A FEW SUPERCELLS ARE EXPECTED TO FORM ALONG THE DRYLINE LATER THIS AFTERNOON...WITH VERY LARGE HAIL LIKELY. AN ISOLATED TORNADO IS POSSIBLE. A WATCH IS LIKELY BEFORE 20Z.