WHATCOM COUNTY, Wash. — High temperatures are expected to jump to the low- and upper-60s a today, Tuesday, March 25, 2025, and tomorrow across most of Whatcom County. A notable increase from high temperatures in the low- to mid-50s over the past week. But forecasters are voicing concerns regarding the potential for severe weather as an unstable weather front moves in across western Washington late Wednesday.
National Weather Service (NWS) Storm Prediction Center warned today there is a marginal risk of isolated severe thunderstorms across parts of the Pacific Northwest, including Whatcom County, Wednesday afternoon into Wednesday evening.
Forecasters in the NWS Seattle office issued the following forecast.
A warm and mild air mass is in place today with arcing high pressure over the region. Radar still shows lingering showers near the Canadian border that will shift farther north this afternoon.
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Click for more informationBy this afternoon, we`re looking at highs reaching the upper 60s to lower 70s (warmest of the season so far) that will likely break record daily maxes for a few spots.
From the Storm Prediction Center, there is a Marginal Risk of severe weather across the region (isolated severe storms are possible). Hail and wind are the main threats, along with cloud-to-ground lightning and periods of heavy rainfall.
Severe weather parameters decrease late Wednesday evening as the cold front moves inland
– National Weather Service Seattle office (March 25, 2025)
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The Whatcom County Sheriff’s Office Division of Emergency Management’ daily briefing provided more localized details.
Unsettled, unstable, and very warm weather will then return on Wednesday with two waves of showers expected, one during the late-morning/early afternoon hours and another early-to-mid evening. Thunderstorms will be possible with both waves (though more likely with the evening wave) where any storms will be capable of heavier downpours, small hail, lightning, and gusty winds. The second wave of showers on Wednesday evening is also expected to bring breezy non-thunderstorms winds.
Rain showers and possible thunderstorms linger Wednesday evening before the thunderstorm threats end by midnight. Unsettled, showery weather then persists off/on from Wednesday night through Friday with perhaps some steadier rainfall developing Thursday evening/night.
– Whatcom County Sheriff’s Office Division of Emergency Management (March 25, 2025)
Whatcom News readers are encouraged to stay up to date with current weather alerts and forecasts and air quality readings for their specific Whatcom County locations along with tide tables via the Whatcom News Weather page.
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