Here goes: Use these terms in your CurrentConditions expression:
[timezone] - shows text abbreviation of your timezone
[timezonegmt] - what [timezone] used to be
[timezonelocal] - timezone from your windows settings(independent of LOC ID)
[moonphase] - displays a number 1 through 40 in ratio with current moon age
[moonvis] - percentage of moon visible currently
[moonage] - age of moon in days and hours
[moon] - textual description of current moon phase
[nextnewmoon] - date and time of next new moon
[nextfullmoon] - date and time of next full moon
[windknots] - provides windspeed in knots
[windms] - provides windspeed in meters per second (m/s)
[windbeaufort] - provides windspeed in beauforts
[windstrength] - a (translatable!) text description of windspeed
[systemtime [timeexpression]] - See Change log for formatting time info
[alert] - Text output for special weather statement (to add along with Alert Icon)
[temp] - temperature
[feel] - feels like
[tempunit] - temperature unit
[city] - city associated with LocationID
[locid] - your Location ID
[citydata] - city where data actually gathered
[cond] - condition description
[humidity] - current relative humidity percentage
[vis] - visibility
[visunit] - visibility unit
[dewpoint] - dewpoint temperature
[update] - when data was last updated by weather.com
[download] - when data was last downloaded (local time to associated location id)
[uv] - uv description
[uvnum] - uv rating number
[long] - longitude
[lat] - latitude
[sunrise] - time of sunrise for today
[sunset] - time of sunset for tonight
[timezone] - abbreviated timezone description
[press] - barometric pressure
[pressdir] - pressure movement
[pressunit] - pressure unit
[wind] - wind speed
[windgust] - gust speed
[windgustms] - gust speed in m/s
[winddir] - cardinal direction
[winddeg] - numeric direction
[windunit] - windspeed unit
[presssymbol] - Barometer direction arrow symbol (use Wingding font for output)
Use these terms in your Forecast Expression:
[high] - high temp for chosen day
[low] - low temp for chosen day
[tempunit] - temperature unit
[sunrise] - sunrise for chosen day
[sunset] - sunset for chosen day
[city] - city name associated with location id of forecast
[download] - time data was downloaded
[timezone] - forecast location timezone description
[moon] - text description of moon phase on chosen day
[moonvis] - percentage visibility of moon on chosen day
[moonphase] - percentage visibility of moon on chosen day (number between 1 and 40)
[update] - time data was updated
[precip] - chance of precipitation of chosen day
[precipn] - chance of precipitation of chosen day during nighttime
[humidity] - percent humidity of chosen day
[humidityn] - percent humidity of chosen day during nighttime
[dayname] - name of chosen day (ie, Mon)
[daydate] - date of chosen day (ie, Jan 1)
[cond] - condition description of chosen day
[condn] - condition description of chosen day during nighttime
[wind] - windspeed for chosen day
[windn] - windspeed for chosen day at night
[windgust] - gust speed for chosen day
[windgustn] - gust pseed for chosen day at night
[winddir] - wind direction for chosen day
[winddirn] - wind direction for chosen day at night
[winddeg] - in degrees
[winddegn] - in degrees at night
[windunit] - wind speed unit
[details] - Text Forecast Narrative for choosen day or night
[detailsupdate] - Last Forecast/Narrative Update
Use these terms in your Hourly Expression:
[update] - when data was last updated
[moonvis] - percentage visible of moon for chosen hour
[moonphase] - percentage visibility of moon for chosen hour (number between 1 and 40)
[timezone] - timezone of associated location id
[download] - when data was last downloaded
[temp] - hourly temp
[tempunit] - temperature unit
[feel] - hourly feels like temp
[hourname] - name of hour (ie, 12 PM)
[precip] - hourly precipitation chance
[cond] - hourly condition description
[dewpoint] - hourly dewpoint
[humidity] - hourly humidity
[wind] - hourly windspeed
[winddir] - hourly wind direction
[winddeg] - hourly wind degree
[windunit] - windspeed unit
Use these terms in your Now & Later Expression:
All tags display time relevant information related to Today, Tonight, or Tomorrow
[temp] - Expected Temp
[name] - Displays "Today" / "Tonight" / "Tomorrow" (Tonight after 2PM (1400))
[precip] - Expected Chance of Precipitation
[humidity] - Expected Relative Humidity
[cond] - Expected Textual Condition Description
[wind] - Expected Windspeed
[winddir] - Expected Wind Direction
[winddeg] - Expected Wind Direction in Degrees
[high] - Expected High temp
[low] - Expected Low temp
*NEW
[sun] - Will show the actual TIME of the sunrise
[sundesc] - Will show "Sunrise" if in the morning
Let me know if I am missing any here
EDIT [torsius]: I've gone through the actual source of the plugin, and verfied and updated the listing, and clarified a few of the tags, it is now COMPLETE! thanks kev for getting 99% on first post!
EDIT [Spewed]: On the latest Weather.2004 (version 0.992) tags changed from <> to []. Tags are updated now to this expression list too.
EDIT [KMDonlon]: Added 2 new expressions to the Now & Later functions list.
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) to the thread title or beginning of your post Kevin? Just so people don't try and use these codes in other scripts/plugins 
favorite plugin...
