Severe

* WHAT...Sub-freezing temperatures as low as 28 to 32 expected. * WHERE...Upper Hood River Valley County. * WHEN...From midnight tonight to 8 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Expect the coldest temperatures near Parkdale. Take steps now to protect tender outdoor plants from the cold. Consider temporarily moving outdoor potted plants indoors if they are sensitive to cold temperatures.

* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Foothills of the Blue Mountains of Oregon and Washington, Lower Columbia Basin of Oregon and Washington, North Central Oregon, Kittitas Valley, and Yakima Valley. * WHEN...From 11 PM this evening to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures as low as 25 expected. * WHERE...Wallowa County. * WHEN...From 11 PM this evening to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures as low as 21 expected. * WHERE...Grande Ronde Valley. * WHEN...From 11 PM this evening to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...Simcoe Highlands. * WHEN...From 11 PM this evening to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures between 29 and 32 degrees expected. Locally down to 27 degrees in outlying areas around Moses Lake. * WHERE...Brewster, Alpowa Summit, Lewiston, Bridgeport, Omak, Ephrata, Clarkston, Moses Lake, Othello, Disautel Pass, Tonasket, Lapwai, Peck, Nespelem, Oroville, Quincy, Lewiston Grade, Gifford, Pomeroy, Okanogan, and Culdesac. * WHEN...From 11 PM this evening to 9 AM PDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other

* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, and Lower Snake River Plain. * WHEN...From 4 AM to 9 AM MDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Extensive cloud cover will be a limiting factor, likely making sub-freezing temperatures very short-lived. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures as low as 25 possible. * WHERE...Wallowa County. * WHEN...From this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures as low as 30 possible. * WHERE...Simcoe Highlands. * WHEN...From this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Sub-freezing temperatures as low as 21 possible. * WHERE...Grande Ronde Valley. * WHEN...From this evening through Tuesday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.