fix import

Author: zacharyburnett

stormevents/stormevent.py

@@ -7,6 +7,7 @@
 
 import pandas
 import xarray
+from pandas import Series
 from searvey.coops import COOPS_Interval
 from searvey.coops import COOPS_Product
 from searvey.coops import COOPS_Station