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TELLER COUNTY, COLO. -- Westminster Police are asking for the public's help with information on a missing hiker.

Jeremy Griess disappeared on April 11, 2010, from his home in Westminster. Jeremy is 39 years old, 5 feet 10 inches tall, weighs 165 pounds, has dark brown/black hair and hazel eyes. He has a faint scar above his lip.

Griess' family believes he was last wearing jeans, a t-shirt and boots. He is driving a 1999 black two-door Honda Accord with a bike rack on the roof (CO tag 940 JSE).

Until Saturday, his family had no information on his whereabouts. However, using cellular phone data technology, they now believe he is within a 20-mile radius of the AT&T cellular phone tower in Woodland Park, most likely the northwest, west or southwest sectors.

Based on areas he frequently visited, they believe the most logical search areas are the following:

*  Along Highway 67, between Deckers and Woodland Park

*  Along Highway 67, between Divide and Triple Creek

*  On highway 24, between Eleven Mile State Park and Woodland Park

Search efforts Sunday are being coordinated from a public parking lot directly in front of the Teller County Sheriff's office, located on Hwy.24 in Divide. The family requests that anyone interested in helping search for Jeremy meet at the parking lot after 11:30 MST to better coordinate efforts.

The family understands that it is not uncommon for someone to "go missing." However, they say this is very uncharacteristic of Griess, who is an excellent communicator. "We are deeply concerned that he is injured, and we are desperate to find him before we run out of time. We have a lot of ground to cover," said sister Amy Cannella.

Anyone with information in this case can contact the Westminster Police Department at 303-658-4360 and reference case number 2010 6054.

Information provided by Jeremy Griess' sister Amy Cannella.