Marine Weather and Tide Forecast for Klickitat, WA

PREV DISCUSSION
/issued 249 AM PDT Mon Apr 28 2025/

SHORT TERM
Today through Wednesday
The strongest of the breezy winds that flowed through the Cascade Gaps on Sunday will subside this morning, however with a progressive synoptic pattern overhead, expect gusts to remain elevated in the 25-35 mph range for the Gorge and Kittitas Valleys during the day both today and Tuesday.
Noticeable breezes will prevail elsewhere in the Basin and into central Oregon during the daytime hours as well with gusts up to 25 mph at times. Otherwise the weather will remain clear and dry until Tuesday.

Late Monday overnight into Tuesday, an upper-level wave will clip us to our northeast, providing for a chance of precip for most of the forecast area. This wave has tracked a bit more southward across the latest model runs, resulting in an uptick in the precip forecast, primarily for the eastern mountains. Still not expecting this system to be a heavy-hitter, but NBM probabilistic guidance has upped probabilities of at least a tenth of an inch of liquid precip falling over the northern Blues up to the 70-80% range, with similar amounts over the crests of the Cascades as well. Precip is less impressive across the lowlands, however, amounting to only a few hundredths, with shadowing prevalent over central Oregon and the Gorge, given the system's track.

Dry northerly flow then builds in on Wednesday ahead of a ridge set to move over the forecast area by the end of the work week. We'll see a steady warming trend across the region as a result, with highs well into the 80s possible as a welcoming gift from May's arrival.
Evans/74

LONG TERM
Thursday through Monday
Sensible weather concerns through the extended forecast continue to focus on the passage of an upper low feature Friday through the weekend that will produce showers and a slight chance (<25%) of isolated thunderstorms at times. Breezy conditions and cooler conditions will also develop with the trough passage over the weekend.

Thursday through early Friday, the PacNW will continue to be under the influence of an upper level ridge passing overhead, resulting in dry and warm conditions area-wide. A warming trend under the upper ridge will result in afternoon temperatures warming into the upper 70s to mid 80s across the lower elevations of the forecast area Thursday and Friday (confidence 75-90%).

Thursday night, ensemble cluster guidance remains in great agreement that the upper ridge will begin to traverse the Rockies, with an upper level trough and cold front boundary swinging towards the PacNW. The upper trough will develop a slight negative tilt as it approaches the PacNW coast Friday morning with a leading south-southwest flow aloft. Widespread showers will develop in the afternoon from southwest to northeast across the forecast area as the upper trough continues to approach the PacNW(confidence 65-75%). The negative tilt and southwest flow aloft will also lead to increasing instability across the eastern mountains and central OR, resulting in slight chances (15-25%) of isolated to widely scattered thunderstorms developing Friday afternoon. Breezy winds (gusts 25-35mph) will develop with the approach and subsequent passage of the cold front Friday afternoon into the overnight hours (confidence 65-75%).

Late Friday night into Sunday, the upper trough will slowly push across the PacNW, resulting in persistent rain and high mountain snow showers across the Cascades and the eastern mountains (confidence 60-75%). However, as the upper trough axis approaches the Cascade crest Saturday afternoon, rain showers will retreat to the Cascades and eastern mountains with dry conditions persisting in the lower elevations through Sunday (confidence 55-70%).
Breezy winds (gusts 20-40mph) through the Cascade gaps and into the Columbia Basin and portions of north central OR will persist into Saturday and Sunday, with the strongest winds expected Saturday afternoon through the Kittitas valley and eastern Columbia River Gorge. Overall, ensemble guidance remains in good agreement with progression of the upper trough in Saturday afternoon, though some differences in timing/strength begin to present themselves the second half of Saturday. Saturday night into Sunday, the disagreement only grows amongst ensemble cluster members, as 48% of members favor the trough transitioning into a closed low Saturday night, with 39% of members favoring the closed low forming Sunday afternoon. In regards to the closed low, disagreement is present on it's position, with ensemble cluster solutions ranging from southern CA to central CA/southern NV; in regards to impacts, the further south the closed low, the drier the conditions across the forecast area. Overall, confidence is moderate (50-60%) that showers will continue over the mountain areas Saturday night through Sunday afternoon, with breezy conditions over the lower elevations.

Sunday afternoon into Monday, confidence is moderate (40-50%)
that the upper low will move east of the region, resulting in mostly dry conditions across the forecast area. Ensemble members do favor very light showers continuing across the Cascades and eastern mountains through Monday as southwest flow aloft develops over the PacNW. Lawhorn/82



PRELIMINARY POINT TEMPS/POPS
PDT 70 48 68 42 / 0 10 70 0 ALW 69 50 67 44 / 0 20 80 0 PSC 75 49 74 41 / 0 10 50 0 YKM 75 49 73 40 / 10 30 10 0 HRI 73 50 72 42 / 0 10 60 0 ELN 67 48 65 41 / 0 30 20 0 RDM 69 41 65 32 / 0 10 20 0 LGD 67 44 60 37 / 0 10 80 0 GCD 68 42 61 36 / 0 10 60 0 DLS 68 50 68 42 / 0 20 20 0

PDT WATCHES/WARNINGS/ADVISORIES
OR...None.
WA...None.