– The environmental temperature at 500 millibars minus the 500 millibar parcel temperature on a Skew-T diagram. Negative LI values are unstable.

An electrical discharge from a thunderstorm.

– In probability of precipitation statements, the equivalent of a 60 or 70 percent chance.

– Low Level Jet. Strong Planetary Boundary Layer winds which advect warmer temperatures and moisture into the forecast area.

The center of an area of low pressure, accompanied by cyclonic and inward wind flow in the northern hemisphere. Also known as a cyclone.

– Large downbursts with 2.5 miles or larger outflow diameter and damaging winds lasting 5 to 20 minutes. Intense macrobursts could cause tornado-force damage.

– A regional phenomena where the heat low shifts east across the Pacific Northwest, along an onshore flow of cool, marine air to spill over the Cascades. It is characterized by a gusty winds and the potential of convection across the Inland Northwest.