Update 10:00 AM Sunday: The Inland NW severe thunderstorm risk has been upgraded to “slight”, the 2nd of 5 categories. There is a 2% chance of tornadoes in the yellow area, and the entire dark green and yellow areas have a 5% chance of severe wind (58+ mph) and severe hail (1+” diameter). The best chance for severe thunderstorms will be in the afternoon to evening, mainly over the Blue Mountains.
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FastCast—Sunday, May 15 to Thursday, May 19:
After a warm and breezy day on Saturday, with partly sunny skies and highs in the mid to upper 60s, another round of rain is ahead. Expect 0.25 to 0.5 inches across the Lowlands and 0.5-2 inches on the coast and in the mountains. Highs will be in the upper 50s to low 60s, with lows in the upper 40s to low 50s. Expect partly to mostly cloudy conditions on Monday and Tuesday, with highs in the upper 50s to low 60s, and lows in the low to mid 40s. The next round of rain arrives Wednesday, with showers continuing into Thursday morning. Highs Wednesday and Thursday will be in the mid to upper 50s, with lows in the low to mid 40s. On Sunday, there is a chance of severe thunderstorms around the Inland Northwest. Take a look below for more information!
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Continue reading the full blog below!
Another round of rain is heading for the Pacific Northwest. This system will also generate instability in the Inland Northwest, bringing a chance of severe thunderstorms, according to the NWS Storm Prediction Center’s outlook, seen below.
The dark green shaded area has a marginal risk of severe thunderstorms, including a chance of severe wind (58+ mph) and severe hail (1+” in diameter).
The NWS Spokane graphic below shows some of the hazards to expect and what time thunderstorms are most likely.
The UW model below is showing CAPE (Convective Available Potential Energy), or instability in the atmosphere, around 7 PM Sunday.
CAPE values will reach 600-1000 over parts of SE Washington, NE Oregon, and Western Idaho. These values are conducive to thunderstorm development.
Two other aspects of thunderstorm development are temperatures and dewpoints. With highs in the mid 70s to low 80s and dewpoints in the 50s, both are conducive to thunderstorms.
Meanwhile, no thunderstorms are expected on the west side of the Cascades, but another round of rain is on the way. The HRRR model below shows expected rain totals through Monday.
Expect 0.3 to 0.5 inches around the lowlands, with 0.5-1 inch on the coast. The Olympics and Cascades will receive 1-2 inches.
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