Heat Wave Update: Hottest Temperatures of 2022 Begin Saturday

 FastCast—Saturday, June 25 to Friday, July 1:

The first heat wave of 2022 is upon us. Temperatures will increase on Saturday, with highs reaching the mid 80s in the lowlands. Near the water, temperatures will be in the low 80s, and near the foothills, highs will reach the upper 80s. The coast will reach the mid 70s to low 80s, coolest near the ocean. Eastern Washington will reach the upper 70s to low 90s. Temperatures further increase on Sunday and Monday, with Monday being the hottest day. Lowland highs will reach the upper 80s to low 90s, by far the hottest of the year so far. The coast will reach the upper 70s near the water to the upper 80s inland on Sunday, but decreasing to the upper 60s to mid 70s on Monday as marine air moves in. Eastern Washington will be sweltering, with highs in the upper 80s to mid 100s. An important note will be that lows in the lowlands during this heat wave will be in the upper 50s to low 60s, quite warm for nights in Western Washington. It is very important to note that water temperatures are still very cold, only in the upper 40s to near 60. Remember that shock and hypothermia can easily occur at these temperatures.

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A heat wave is ahead for the Pacific Northwest. While it will not be even close to the June 2021 heat wave, the temperatures will still be hot for our area. 

The GFS forecast below for Saturday shows what high temperatures to expect.

Expect highs in the mid to upper 80s south of Seattle and in the upper 70s to low 80s north of Seattle. The coast will reach the mid 70s by the water to upper 80s inland. Eastern Washington, SW WA, and the Willamette Valley will reach the upper 80s to low 90s.

Temperatures increase further on Sunday and Monday. This is because of the heat trough, a tongue of low pressure moving north from California. The heat trough enhances temperatures and offshore flow, increasing the temperatures area-wide.

The Sunday forecast from the GFS ensemble forecast is below.

The heat increases around the region. Expect lowland highs on Sunday in the upper 70s to mid 80s north of Seattle and upper 80s to near 90 south of Seattle. The coast will reach the upper 70s to upper 80s. Eastern Washington, SW WA, and the Willamette Valley will reach the upper 80s to mid 90s.

Monday will be the hottest day around the area, except on the coast, where temperatures will be decreasing as the marine push moves in. The European model forecast for Monday is below.

Expect lowland highs in the upper 80s to low 90s. The coast will reach the upper 60s to mid 70s. Eastern Washington will reach the upper 80s to mid 100s. SW Washington and the Willamette Valley will reach the low 90s.

Another aspect of this heat wave will be warm low temperatures, as seen below on the high-resolution NAM model for lows from Saturday night to Sunday morning.

Expect lows around the region in the upper 50s to mid 60s, with some locations only reaching the upper 60s at night. 

Ahead of this heat wave, Heat Advisories (orange) have been issued for most of the Pacific Northwest.

While warning about the heat, the advisories also warn about water safety. Remember that water temperatures are in the upper 40s to near 60. Serious consequences exist from not taking caution in the water during this weather. Stay safe!

Another update will be posted on Sunday night, ahead of the hottest day on Monday.