Marine Weather and Tide Forecast for Kittitas, WA

FXUS66 KPDT 132227 AFDPDT

Area Forecast Discussion National Weather Service Pendleton OR 227 PM PST Mon Jan 13 2025

SHORT TERM
Today through Wednesday...Through most of the short term period, the PacNW will be under a high pressure system before flattening Wednesday night. There are no expectations for precip for the forecast period. This system makes it favorable for fog development and low stratus in the Columbia Basin and north central OR during the morning and night hours tomorrow onwards (>50% chance). Low temperatures and dewpoints may reach to sub freezing during those times as well. Winds will be light until becoming breezy (15-25 mph) starting Wednesday around portions of the Blues and the Wallowas from increased surface gradients. Feaster/97

LONG TERM
Thursday through Monday...Cold and mostly dry conditions expected for the period as models are in good agreement on north to northwesterly flow aloft prevailing over the forecast area through early next week. Our high mountain zones may see some intermittent light snow, but thus far guidance is not depicting any significant precipitation threats through the next 7 days.

Ridging will prevail through the midweek before flattening out as a shortwave induces NW flow starting on Thursday. This system may produce light precip over the central WA Cascades and northern Blues (PoPs 20-30%), but otherwise this NW flow is pretty dry in nature, so the main effect for the forecast area will be the onset of much colder temperatures than what we've been experiencing thus far this year. A deepening trough over the Canadian Prairies will only further enhance cold air advection into the forecast area through next weekend, bringing temperatures down to 10 to even 15 degrees below average. Guidance depicts overnight lows dipping into the teens for much of the forecast area by the end of the period, with areas such as the Bear Valley, Meacham, and Deschutes County above 4000 feet likely (confidence 60-70%) seeing single digits. Low clouds may form under this pattern in the Basin as well, however confidence in this occurring is on the lower end (20-30%), as this prevailing flow pattern may induce enough dry air and high clouds as to inhibit fog and low stratus development.

As mentioned before, the prevailing N/NW flow may intermittently induce orographic precip over primarily the WA Cascades and northern Blues, but significant accumulating snow is not anticipated (confidence 80-90%). As far as the forecast beyond the period is concerned, the deterministic GFS tries to nudge ridging back into the forecast area by the middle of next week, while the ECMWF keeps NW flow prevailing aloft for the foreseeable future. Evans/74
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