Failure to act could do what rain, sleet, and snow have failed to do--stop the delivery of the mail.
sleet is rain mixed with snow; there are pellet like snowflakes that fall between warming and cooling fronts.
Later, men soaked in sleet walked along the Garden Ring, oblivious to the weather and glowing with happy smiles.
In the past 63 years—through rain, sleet, snow, and bone-chilling cold—there have been 15 inaugural parades.
“Rain, sleet, snow, shark, alien invasions, whatever,” Dobles says.
They could scarce see their way through the sleet they had to face.
After this thick, hazy weather again came on, with sleet and snow.
The army trudged through mud and sleet until November the 26th when the river Berezina was reached.
Hair and eyebrows were matted with ice and a coat of sleet covered his clothes.
Amid a terrible storm of sleet and snow, on the night of March 11, the Imperial party entered Berlin.
c.1300, slete, either from an unrecorded Old English *slete, *slyte, related to Middle High German sloz, Middle Low German sloten (plural) "hail," from Proto-Germanic *slautjan- (cf. dialectal Norwegian slutr, Danish slud, Swedish sloud "sleet"), from root *slaut-.
early 14c., from sleet (n.). Related: Sleeted; sleeting.
Precipitation that falls to earth in the form of frozen or partially frozen raindrops, often when the temperature is near the freezing point. Sleet usually leaves the cloud in the form of snow that melts as it passes through warm layers of air during its descent. The raindrops and partially melted snowflakes then freeze in the colder layers nearer the earth before striking the ground as pellets of ice, which usually bounce. By contrast,hail forms by the accumulation of layers of ice on the hailstone as it moves up and down in the cloud, and hailstones can become much larger than sleet pellets. The word sleet is also used informally to describe a mixture of snow, sleet, and rain.