The weather outside was frightful for much of the East Coast last month, but retailers still managed to post some delightful sales numbers as reaction to spring merchandise helped them overcome the nearly constant interference of winter weather. Macy’s Inc. posted a 5.8% increase in same-store stores, well above the 3.7% percent increase expected by analysts. “Our fiscal 2011 started off with a stronger-than-expected February performance at both Macy’s and Bloomingdale’s,” s...