Marine Weather and Tide Forecast for Klickitat, WA

PREV DISCUSSION
/issued 743 PM PDT Fri Jun 20 2025/

EVENING UPDATE...Winds remain very gusty across the forecast area in the wake of a passing cold front. Adjusted winds upward as a result, as the Cascade Gaps this evening are still seeing gusts in the 40+ mph range, extending down into the lower Basin as well.
Also pulled back PoPs in the lower Basin through tomorrow morning, as models bring the dry slot of the upcoming low right through the middle of the Basin, so looking like the rain forecast will be pretty paltry for the lower Basin in particular. Overall messaging, save for Basin rain, remains intact, however. Evans/74

PREV DISCUSSION... /issued 148 PM PDT Fri Jun 20 2025/

SHORT TERM
Tonight through Sunday
Satellite imagery this afternoon shows a broad low coming ashore the PacNW with cirrus decks developing across most of the mountainous terrain and portions of the Columbia Basin. Meanwhile, regional radar imagery shows most of the shower activity is contained west of the Cascade crest, and well north along the Canadian/WA border.

The upper low coming onshore now will continue to swing across the PacNW through late Saturday with widespread shower chances across the forecast area. A slight chance of an isolated thunderstorm or two over portions of central OR and the eastern mountains will be possible this afternoon as weak surface instability and modest low to mid level lapse rates will be present for any developing showers to tap into. Snow levels will also be dropping to around 5kft across the mountainous terrain tonight, resulting in chances of light snow or rain/snow mix showers. Tomorrow, another round of slight chances of thunderstorms will develop over the eastern mountains as the upper low moves over that area, with widespread shower chances continuing across the remainder of the forecast area. Breezy to windy conditions that have developed through the Cascade gaps and lower elevations will continue through this evening and weaken slightly overnight tonight through tomorrow.
The strongest winds are expected through the Kittitas valley and eastern Gorge (gusts 40-45mph) through late this afternoon.

Sunday, the upper low circulation will lift up into central Canada, leaving an open wave trough over the western CONUS and norther flow aloft into the PacNW. Shower chances will diminish with the exit of the upper low circulation, with a drying trend returning late Sunday. Winds will also become light across the region as the pressure gradients relax.

Temperatures through the weekend will be near to below normal, with afternoon highs in the mid 60s to 70s today and Sunday, and upper 50s to lower 70s Saturday. Lawhorn/82

LONG TERM
Monday through Friday
Ensemble guidance continues to be in good agreement in weak ridging developing across the northern half of the PacNW into BC, while weak troughing develops across the southern half and down into the Desert Southwest Monday into early Wednesday. This will result in drier conditions at the surface with near zero chances of precipitation during this period, except for slight chances (%15) of showers developing along the WA Cascade crest in the afternoons(confidence 70-80%).
The lack of a system moving through will also result in light winds prevailing, with locally breezy conditions developing in the afternoons(confidence 70-80%). Members of both the ECMWF and GFS ensemble suites do continue to favor a warming trend into the midweek, with afternoon high temperatures in the upper 80s to mid 90s by Tuesday (confidence 60-80%).

Late Wednesday through Thursday, ensemble cluster guidance mostly agrees in upper level troughing in the northeast Pacific sliding into the PacNW, producing light showers mostly across the WA Cascade crest, northern Blues, and Wallowas on Thursday. That said, ensemble cluster guidance shows a split on how strong the incoming trough will be, with around 45% of members favoring little to no precipitation chances as the trough stays further north. As we look into Friday, about 40% of the members slow the upper trough passage, resulting in another round of shower chances across the WA Cascades and northern Blues. At this time confidence in the precipitation forecast during this time is moderate (40-50%). Otherwise, confidence is mod-high (65-75%) that the upper trough passage will help to knock temperatures down a few degrees Thursday and Friday, with afternoon high temperatures in the 80s. Lawhorn/82

PRELIMINARY POINT TEMPS/POPS
PDT 46 67 47 75 / 20 40 60 40 ALW 50 67 49 73 / 30 30 50 40 PSC 47 70 48 78 / 20 30 40 20 YKM 46 70 49 78 / 20 50 30 30 HRI 47 70 48 78 / 20 30 50 20 ELN 46 68 48 77 / 30 50 30 40 RDM 34 59 37 70 / 40 70 60 10 LGD 42 60 43 66 / 40 50 70 50 GCD 39 61 41 68 / 60 70 80 40 DLS 49 67 51 78 / 30 60 40 10

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