Clear skies, possible aurora activity forecast in Washington

SEATTLE, WA – The final days of September are expected to be sunny and warm as the remaining clouds dissipate and temperatures are well above seasonal norms according to the latest forecasts.

On the first day of October, afternoon highs of over 80 were reached in the Seattle region – a rare achievement for a month in which such temperatures have only occurred seven times in the past 75 years.

Warming Trend This Week. Highs way above normal with 70s Tues, 70s & lower 80s Wed & Thurs. It is rare that a day with more than 80 ° is reached in October in Seattle. There were only 7 in 75 years with the last 27 years ago being October 3, 1993. There’s a chance for another Thursday. #wawx pic.twitter.com/lCDDo0R1wG
– NWS Seattle (@NWSSeattle) September 27, 2020

Forecasters expect the last clouds to dissipate on Sunday afternoon, leaving a clear sky that should last until next weekend. Monday could start off with a bit of spotty fog in some areas, with plenty of afternoon sunshine and temperatures in the mid-60s to mid-70s. Tuesday should be a “copy” of the previous day, with temperatures a few degrees warmer before afternoon highs into the lower 80s on Wednesday.

NOAA Issues Moderate Geomagnetic Storm Watch; Northern Lights potential in Washington

The cloudless conditions are well balanced with a moderate geomagnetic storm that can allow a visible aurora over west Washington, particularly late Monday and early Tuesday.

Possible aurora for West Washington for Monday evening and Tuesday morning still on track. At the moment it looks like the activity will peak in the late evening on Monday / early morning on Tuesday. Places north of the yellow line on the map to the right have the ability to see the aurora. # Wawx pic.twitter.com/9tQRdEus5m
– NWS Seattle (@NWSSeattle) September 27, 2020

According to the Space Weather Prediction Center’s planetary K-index – a measure of the strength of a geomagnetic storm – the values ​​achieved during peak hours would potentially allow visibility near Seattle. As usual, the best way to see the lights is in areas away from the city lights with clear views of the northern sky.

Find current weather conditions in space and learn more about the best viewing strategies on the SWPC website.

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