Favorite Links

Basic weather data:
http://www.wunderground.com/
Wunderground is a great site that gives basic to intermediate weather data. What I like about this site  is the ability to select from a number of stations within a city, something you can't due with all weather sites. What is especially fun about wunderground is their wunderground map. With this map, you're able to select a number of weather conditions to display including lightning strikes, tornadoes, snowfall, water levels of rivers, fires..etc. It's just a fun map to play with if you're a weather nerd. Wunderground also has a nice current surface data map showing fronts, radar, and jetstream isobars.

Current surface data:
http://www.weather.com/maps/maptype/currentweatherusnational/uscurrentweather_large.html
This is a link to the weather channels current surface data map, which like wunderground's shows fronts, precipitation, and jetstream isobars. With these types of maps it is most useful looking at ridges or troughs in the jetstream to get an idea the sorts of temperatures to expect the next couple of days, and to look at the high and low pressure systems.

In-depth current surface data:
http://weather.unisys.com/surface/sfc_map.php?inv=0&t=cur&region=us&expanddiv=hide_bar
Unisys is an excellent weather site that contains in depth analyses and forecast data/maps. This particular link sends you to the US current surface data map. From there you can pick on a region where the map is not as overwhelming to look at. The data around each station shows (in counter-clockwise order) temperature, weather, dewpoint, barometric pressure, clouds, and wind speed and direction. From this page, you can also   choose surface data up to 12 hrs back in 1 hr intervals.

Surface data symbol legend:
http://weather.unisys.com/info/wxp_legend.php
To go with any current surface data map is this key from Unisys showing what all of the symbols mean. Very useful if you're just getting into reading these maps.

Upper air data:
http://weather.unisys.com/upper_air/ua_man.php?plot=500&inv=0&t=cur&expanddiv=hide_bar
Unisys also has maps on upper air data, or wind speeds and directions. From here you can choose from 10 different pressure levels from surface wind conditions (925 mb) to jetstream patterns (100mb). These can be  useful in tracking storm paths. If you can't tell by now, Unisys is a great weather site.

More surface data maps:
http://www.accuweather.com/en/us/national/weather-surface-maps
Accuweather doesn't have the most in-depth surface data maps , but what is nice is that they show forecast surface data in 12hr progressions up to two days in an easy to understand way. To the right of the first two surface data maps are also a 'today's jetstream' and a 'tomorrow's jetstream map' which give you a quick and easy look at the jetstream pattern - whether there is a trough or ridge in your area, and if it'll be damp, warm, cool, or dry.

Daily briefing:
http://www.noaawatch.gov/briefing.php
NOAA has a lot to offer as well in regards to weather information. This link is the daily briefing link that shows a current forecast weather map (much like a current surface map), hazards assessment through out the US, severe weather outlooks, and flood outlooks. It's a good link to get an overall idea of what else is going on in the US - more than just temperatures, precipitation, and wind. Scrolling down to the bottom of the page you will find a plethora of additional links within NOAA in which to explore and discover weather!

Jetstream:
http://www.intellicast.com/National/Wind/JetStream.aspx
Intellicast is another great site providing an abundance of information similar to Unisys and NOAA. I mainly use this site for the jetstream map as it is the cleanest and easiest to read. However, Intellicast also has nice surface data maps as well as forecast surface data up to two days.

UW-Eau Claire weather station:
http://metstation.uwec.edu/Current.htm
One of the weather stations in Eau Claire is located on top of Phillips Hall on UWEC campus. In addition to posting current conditions, this site also contains extreme conditions, daily history, weekly history, monthly history, a yearly history, and a data archive.