The following photographs have been sent to us by people all across the Northland. This incredible series of pictures depicts the underside of a shelf cloud, which moved through the Hoyt Lakes area. Time of occurrence was about 415 pm. The next sequence of pictures was also sent by Bill Boutwell, of Hoyt Lakes, and clearly depict the leading edge of a roll cloud.
Roll clouds are similar to shelf clouds.
They do not always signify impending severe weather, but can bring straight-line winds in excess of 100 mph. If you were to look straight at the cloud as it was approaching you, the winds would likely be at your back. Once the shelf cloud passed, you would feel a complete reversal in wind direction, with the winds coming toward your front. The next series of images from Bill Boutwell shows an impressive shelf cloud moving through the Hoyt Lakes area. The following were pictures taken by Rick Olivo of the Ashland Daily Press.