When starting a thread it is best to use more precise terms than "today" or "next weekend" as those terms lose meaning in short order. Also, in the future it makes it easier for readers to find relevant information. Even using just days of the week leaves out a lot of information since those repeat quite often.

For example:

Weather Today -> Weather 5/8/09

Tuckerman Trail Conditions Next Weekend -> Tuckerman Trail Conditions 5/9 & 5/10

Effects on Weather Due to Planetary Alignments During the Full Moon -> Effects on Weather Due to Planetary Alignments During the Full Moon of 5/9/09