Weather Alerts For Prosser, WA

# HEADLINE -------------------- FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PDT FRIDAY # DETAILS -------------------- WHAT Sub-freezing temperatures as low as 24 expected. WHERE Lower Columbia Basin of Oregon and Washington, Foothills of the Northern Blue Mountains of Oregon, Kittitas Valley, and Yakima Valley. WHEN Until 9 AM PDT Friday. IMPACTS Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. ISSUED AT Thursday, April 16, 2026 at 10:29 PM PDT ISSUED BY National Weather Service Pendleton OR HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Take steps now to protect tender plants from the cold. # AREAS AFFECTED -------------------- Foothills of the Northern Blue Mountains of Oregon, Kittitas Valley, Lower Columbia Basin of Oregon, Lower Columbia Basin of Washington, Yakima Valley Including the cities of Tri-Cities, Naches, Thorp, Connell, Hermiston, Ellensburg, Prosser, Pilot Rock, Athena, Ione, Sunnyside, Boardman, Yakima, Pendleton, and Toppenish

Pollen Index: 10.1 Pollen Level: high Predominant Pollen: Mulberry, Sycamore and Ash. The pollen levels for Saturday will be falling but will remain in the high range. Since the weather has a major influence on pollen dispersal, this decrease is due in part to rising relative humidity and relatively weaker winds.