NOAA logo  
alert map
Radar valid at 1100 pm PDT, Jun 28th 2021

alert legend

...HEAT WAVE EXPECTED LATE THIS WEEK THROUGH EARLY NEXT WEEK... .Strong high pressure over the Pacific Northwest will bring a stretch of unseasonably hot weather to much of southwest Washington and northwest Oregon beginning Friday and lasting through at least next Monday. High temperatures will run 20 to 30 degrees above normal for late June at many locations, putting numerous daily records and perhaps a few monthly high temperature records in jeopardy. Overnight lows will also be unseasonably warm, limiting the amount of relief from the heat and contributing to increased risk of heat related illnesses. The heat is expected to peak this weekend, with conditions remaining hot into Monday and then gradually trending downward towards the middle of next week.

Lower Columbia-Greater Portland Metro Area-
Central Willamette Valley-South Willamette Valley-
Upper Hood River Valley-Western Columbia River Gorge-
Central Columbia River Gorge-Willapa Hills-I-
5 Corridor in Cowlitz County-Greater Vancouver Area-
South Washington Cascade Foothills-
Including the cities of St. Helens, Clatskanie, Hillsboro,
Portland, Wilsonville, Oregon City, Gresham, Troutdale, Salem,
McMinnville, Woodburn, Stayton, Dallas, Eugene, Springfield,
Corvallis, Albany, Lebanon, Parkdale, Odell, Corbett,
Rooster Rock, Multnomah Falls, Cascade Locks, Hood River,
Willapa, Frances, Ryderwood, Longview, Kelso, Castle Rock,
Vancouver, Battle Ground, Ridgefield, Washougal, Yacolt, Amboy,
Toutle, Ariel, Lake Merwin, Yale Lake, Cougar, North Bonneville,
Stevenson, Carson, and Underwood
248 AM PDT Wed Jun 23 2021


* WHAT...Dangerously hot temperatures of 98 to 103 likely, with
temperatures locally 103 to 108 are possible. Overnight low
temperatures mostly 65 to 70 degrees, but few spots such as the
Columbia River Gorge and the Portland-Vancouver metro area may
only cool down to around 75 deg Saturday and Sunday nights.

* WHERE...Portions of Southwest Washington and Northwest Oregon,
including the Willamette Valley, the Lower Columbia River
Valley, and the Columbia River Gorge.

* WHEN...From Friday afternoon through Monday evening, with the
warmest day being Sunday.

* IMPACTS...Extreme heat will significantly increase the
potential for heat related illnesses, particularly for those
working or participating in outdoor activities.

* ADDITIONAL DETAILS...The high daytime temperatures, combined
with warm overnight lows, will result in high heat risk and
heat related stress. Daily high temperature records will likely
be broken. There is a chance to break the all time June high
temperature records for a few locations.


Monitor the latest forecasts and warnings for updates on this
situation. Be prepared to drink plenty of fluids, stay in an air-
conditioned room, stay out of the sun, and check up on relatives
and neighbors.

Young children and pets should never be left unattended in
vehicles under any circumstances. This is especially true during
warm or hot weather when car interiors can reach lethal
temperatures in a matter of minutes.


iNWS is an experimental service intended for NWS core partners, including emergency managers, community leaders and other government agencies only.