from the National Weather Service in Duluth, MN
Radar loop ending 2:52 PM CDT April 11, 2013
from the National Weather Service in Duluth, MN
Snow fell over a prolonged period from 10:25 AM CST (11:25 AM CDT) April 11 to 8 AM CST (9 AM CDT) April 13. The heaviest snow fell very early in the storm from 11 AM to 3 PM CST April 11 with snowfall rates of an inch or more per our 11 AM to 1 PM. Thundersnow produced several brief but very intense bursts of snow. At one point in time, the sky became so dark due to the depth of the clouds and intensity of the snow that some of the street lights came on. A personal observation of thunder was made 15 minutes prior to the start time of the loop. In total, this observer heard thunder at the following times: 11 AM CST (12 PM CDT), 11:40 AM CST (12:40 PM CDT), 11:45 AM CST (12:45 PM CDT), and 12:35 PM CST (1:35 PM CDT).
Fairly strong winds accompanied the first half of the event. Winds occasionally gusted over 40 mph into the overnight morning hours after midnight April 12. Peak wind reported at the Duluth International Airport was 48 mph from 80 degrees (or the east) on April 11.
Snow totals: Myself 13.9 NWS Duluth 13.3