Morel Mushroom Maps

Generally speaking, the best time to begin looking for morels is when daytime highs in your area have been in the 60’s, with nighttime lows no colder than the 40’s.... and when there has been some precipitation.

Soil Temperature and Precipitation Maps

Greencast has an online soil temperature map for the U.S.  You can on map to zoom in and see the soil temperatures in your area or use the menu and select a region. You can even see soil temperature forecasts for the next five days.

http://www.greencastonline.com/SoilTempMaps.aspx

The USDA maps show the precipitation..
http://www.fas.usda.gov/pecad/weather/us.html

Fire Burn Maps

To find fire burn morels you will need these links to find where forest fires have occured:

National Interagency Fire Centre links to national firemaps:
http://www.nifc.gov/fire_info/maps.htm

The MODIS interactive fire map project http://activefiremaps.fs.fed.us/

The Key Fire Links page by Natural Resources Canada has the best selection of links to all major fire map resources in North America:
http://fire.cfs.nrcan.gc.ca/links_e.php

Progress Maps

The Morel Mushroom Hunting Club has a Morel Progression Map showing the 2008 Season: