National Weather Service: Obs and Radar     Best site for current weather observations. Up-to-the-hour weather observations from any automated weather station in the US (top link) or world (fourth link) for the last 24-hours. Radar is second link down, then "National Composite Loop" link is suggested. Regional views are shown below US view. Click any map for close-up of individual radar sites.

Satellite Images     Images up to 5 days ago. Can set length of loop, time of loop (in UTC), type of image, and regional or US image. Choose "visible" during the day, and IR (infrared) for night images. "Water vapor" shows vapor in top-third of the troposphere (NOT moisture near the surface).

Nat'l surface maps     Good, quick-glance national and Northern Hemispheric maps of temperature, dewpoint, sea-level pressure, snow cover, snow depth, and more, listed on the right. The algorithm plotting the "high" and "low" pressure centers is very liberal.

Precipitation Analysis     Maps of precipitation amounts for the US and state views. Can get precipitation totals for any day or month back to 2005. For snowfall, the values are "liquid equivalent" - depth of water if the snow fell as rain.

US Climate Reference Network     These stations are meant to monitor the US climate and be a consistent climate standard (no development or major landuse changes will occur near them). High quality data. It has daily and recent hourly data, and it's updated every 6-12 hours. There are only two stations in NH (both in Durham).

National Climatic Data Center     Any stations that meet the NWS guidelines are listed here. If the station exists(ed), it'll be here. Many stations have incomplete records, or don't record anymore, so check the time period for which they're valid. It doesn't appear to be updated daily or even weekly (UNH's most recent obs are from 3 months ago, I think). But check through some stations that you're interested in every once and a while and get a sense of how up-to-date the records are. You need to be accessing it from an ".edu" address or they'll ask for money.

National Hurricane Center     Listing of all tropical cyclone information in the Atlantic and Eastern Pacific - straight from the top hurricane experts. Lots of links to information, satellite imagery, forecasts, etc.

Satellite Imagery     Excellent up-close images of active tropical systems. NOAA has "floater satellites" that they maneuver over tropical systems of interest. Visible imagery is of course best to use and easiest to understand, but when dark use "RGB" as this algorithm gives the most realistic depiction of the clouds (yellow clouds are low clouds, white are in the upper half of the troposphere).

Weather Underground     Global view of all tropical cyclones with links to look at each one individually. Sea-surface temperatures shown. Great for looking at tropical systems in other parts of the world. WU brings together the analysis and forecast information from all the official tropical forecasting agencies around the world onto one page.