(Isabella, MN)  —  The wildfire that broke out near Isabella on Sunday afternoon is not slowing down.  The U.S. Forest Service says the Greenwood Fire has grown to over four-thousand acres.  Nearly 150 fire personnel are working to contain the blaze as more people prepare for evacuation.  Yesterday, officials said the fire was caused by random lightning strikes.  They hope this weekend’s cooler weather helps slow the spread of the flames, which could continue to burn for several more days.