Several types of cells in the immune system engulf microorganisms via phagocytosis. 1  Neutrophils. 2  Neutrophils are abundant in the blood, quickly enter tissues, and phagocytize pathogens in acute inflammation. 3  Macrophages. 4  Macrophages are closely related to monocytes in the blood.
Snowfall in Flagstaff ranged from 5 inches to 9 inches, with 8.6 inches at Flagstaff Pulliam Airport. Official record-keeping on Flagstaff's weather began on September 9, 1898, and a 30-year period ending in 2000 has been used in the last decade to determine what is average weather-wise.
The occurrence of snow in the SeattleTacoma area is extremely variable and usually melts before accumulating to measurable depths. There are winters on record with only a trace of snow but at the other extreme, over 21 inches has fallen in a 24hour period. Usually, winter storms do not produce snow unless the storm moves in such a way to bring cold air out of Canada directly or with only a short trajectory over water. Seattle-Tacoma's average first occurrence of 32 degrees Fahrenheit in the fall is November 11 and the average last occurrence in the spring is March 24.