or figuring out the Gray forecast discussion.

HRRR model (from the forcast discussion of 1/11/2012 4:16PM) However...HRRR model continues to show the formation of a strong coastal front and winds switching to the nne of land. Thought at first this was a typo - meant to be brrr, but no there is such a thing. It is an acronym for High-Resolution Rapid Refresh and is a 3-km resolution, hourly updated, cloud-resolving atmospheric model. It is a product of the Earth System Research Lab at NOAA. More informaiton can be found here.

Pineapple Connection (from the forecast discussion of 5/12/2010 1:57PM EST) "In the meantime...it is picking up limited moisture form the Pacific with a limited Pinapple(sic) Connection...with limited moisture also from the Gulf of Mexico." According to Wikipedia "Pineapple Express (also known as Pineapple Connection) is a non-technical, shorthand term popular in the news media for a meteorological phenomenon which is characterized by a strong and persistent flow of atmospheric moisture and associated heavy rainfall from the waters adjacent to the Hawaiian Islands and extending to any location along the Pacific coast of North America." So I think that Gray meant pineapple, not pinapple. More information at Wikipedia here.
Fujiwara flow or the dance of the cyclones
(from the forecast discussion of 2/5/2010 3:12PM EST) “a weak 500mb closed wave retrogrades se into ern ME as it gets caught briefly in Fujiwara flow on nrn periphery of stronger closed low to our south”.
When two cyclones (low pressure areas, not tornadoes) approach each other, their centers will begin orbiting about a point between the two systems. They will be attracted to each other, and eventually spiral into the center point and merge. When they are of dissimilar size, the larger will tend to dominate, and the smaller will orbit around it. After Wikipedia here.

A little more information on the Rex Block that Jerry mentioned 2/27.
(from the forecast discussion of 2/27/2010 6:27PM EST "although the persistant REX BLOCK that has been in place over the northeastern us and Maritimes will gradually break down" Rex blocks consist of a high situated to the north of a low. Very often both the high and the low are closed, meaning that the isobars (or constant geopotential height lines) defining the high/low close to form a circle. Rex blocks are not so-named because they are considered the "king of blocks" (see Rex), although the depiction of air flow around rex blocks on upper-air charts often resembles the mouth of a tyrannosaurus rex. Rather they were named after the meteorologist who first identified them (Daniel Ferrell Rex). After Wikipedia here.