Intersil Corp. (NASDAQ:ISIL) is declining sharply after reporting earnings. Forecasts for the first quarter by the company are well below analyst estimates and this is sending the stock lower by $1.48 to $13.51 a share today. This is a 10.0 percent decline in a single trading day. Traders should watch the $12.90 area for intra-day support. This is where aggressive scalp traders can look for an intra-day bounce in the stock.