31.   A few showers will spread into Nevada, Idaho and southern California.

32.   A brief surge of arctic air will spread into the Northeast later Monday and Tuesday, however, temperatures will average near or above normal elsewhere in the nation.

33.   A band of light to moderate snow will spread into the Upper Mississippi Valley as low pressure dives southeastward.

34.   A few showers will spread into the interior Northwest affecting northern Idaho and western Montana by afternoon.

35.   A few showers will spread into the eastern parts of the Ohio Valley and Great Lakes during the afternoon.

36.   A few thundershowers will spread into Illinois and western Michigan.

37.   A cool and moist air mass will spread into the Northwest, bringing spotty showers.

38.   A new push of polar air should spread into the Pacific Northwest with plenty of clouds and showers inland and a mixture of sun and clouds at the coast.

39.   A large swath of moisture will spread into the Eastern states Tuesday ahead of a cold front moving out of the Mississippi Valley.

40.   A flame arrester is a screen over a pipe that would prevent a fire from spreading into the pipe.