 In June , predictions from CSU and TSR were similar to pre @-@ season forecasts due to the a lack of an El Niño and warmer @-@ than @-@ average sea surface temperatures across the Atlantic Ocean . However , by July and August , CSU and TSR all adjusted their forecasts downward because of predictions of cooler @-@ than @-@ average sea surface temperatures and above @-@ average wind shear . NOAA also decreased the amount of activity in its final outlook , despite predicting a wetter @-@ than @-@ average western Africa and above @-@ average sea surface temperatures in its report . On June 3 , CSU issued its first mid @-@ season prediction for the remainder of the year . In its report , the organization continued to predict well above @-@ average activity , with eighteen named storms , nine hurricanes , four major hurricanes , and an ACE index of 165 units . CSU stated that there was a 72 % chance of at least one major hurricane impacting any stretch of the United States coastline ; the chances of a major hurricane hitting the East Coast and Gulf Coast were 48 % and 47 % , respectively . The following day , Tropical Storm Risk issued its third forecast for the 2013 Atlantic hurricane season , calling for sixteen named storms , eight hurricanes , four major hurricanes , and an ACE of 134 units ; this activity was predicted to be roughly 30 % above the 1950 – 2012 long @-@ term mean . TSR gave a 65 % probability that the landfalling ACE index would be above @-@ average . A month later , TSR lowered its numbers to 15 named storms , seven hurricanes , and three major hurricanes . On August 2 , Colorado State University issued another update for the season , lowering its numbers slightly . However , the organization continued to state that there was an above @-@ average probability of a United States and Caribbean major hurricane landfall . Finally , on August 8 , NOAA issued its second and final outlook for the season , predicting 13 to 19 named storms , six to nine hurricanes , and three to five major hurricanes ; these numbers were down slightly from its May outlook . 
