Recently, some weather services are offering ten and even fifteen-day detailed weather forecasts on their web sites, complete with specific high and low temperatures, cloud cover, and precipitation.

About this I say, web surfer BEWARE. Yes, it is possible one to two weeks out to, in many cases, identify trends - perhaps a change from a dry to wet pattern or the arrival of Arctic air. But it's misleading to suggest that specifics can be timed down to the day that far in advance. For example, say you're interested in the weather for your birthday on January 30. On January 15, you check the 15-day forecast. When you check back on January 20, you'd very likely find the forecast has changed, probably significantly. When you check back again on the 25th, you'd likely see another big change.

I fall back on the official statement of the American Meteorological Society on this subject:

"Claims of skillful predictions of day-to-day weather changes beyond a week or two have no scientific basis and are either misinformed or calculated misrepresentations of true capabilities."