The U.S. Naval Observatory
Determine sunrise or sunset for any location in the country. Find out when the phases of the moon will occur at any pint in the future. The Sky This Week describes what planets can be viewed and what other astronomical phenomena can be observed. The U.S. Naval Observatory is the preeminent authority in the areas of time keeping and celestial observing, and determining and distributing the timing and astronomical data required for accurate navigation and fundamental astronomy.

Vaisala
Vaisala operates the Network Control Center for the U.S. National Lightning Detection Network®, and supplies lightning information to the National Weather Service, aviation, and other users.

NOAA Great Lakes Environmental Research Laboratory
Data, information, and research on the Great Lakes.

USGS Great Lakes Science Center
Information and research on the biological resources of the Great Lakes.

USDA National Agricultural Statistics Service
The mission of the NASS is to provide timely, accurate, and useful statistics in service to U. S. agriculture. Statistics and information are available for virtually every major crop grown in the U.S. The site contains links to individual state offices which provide more specific information on agriculture in their respective states.

Weekly Weather and Crop Bulletin
Recent information on weather and agriculture in the U.S. and in major international agricultural areas. The electronic version is posted by 12:00 p.m. Eastern Time Wednesdays.

Illinois Rivers Decision Support System - ISWS

Illinois Water Supply Planning Site