Marine Weather and Tide Forecast for Pasco, WA
May 17, 2024 4:36 AM PDT (11:36 UTC) Change Location
 | Sunrise 5:18 AM Sunset 8:27 PM Moonrise 2:35 PM Moonset 3:02 AM |
FXUS66 KPDT 170926 AFDPDT
Area Forecast Discussion National Weather Service Pendleton OR 226 AM PDT Fri May 17 2024
SHORT TERM
Today through Sunday night...
Latest radar showed some light showers associated with upper trough and strong shortwave making its way across the region.
This trough and shortwave should continue moving eastward through the overnight hours and the main shortwave should be in Idaho by daybreak. Precipitation will linger over the mountains through the morning before ending. Today's precipitation will mainly be 0.10 inches or less, except along the crest of the Washington Cascades, which could receive up to 0.20 inches.
Friday afternoon into Friday night looks completely dry, then another trough and strong shortwave will drop southeastward from British Columbia and move across the Pacific northwest Saturday into Sunday, with a second shortwave moving sown Sunday night, which will further deepen the trough as it moves eastward.
Any precipitation that occurs, which will mainly be Saturday afternoon into Saturday night, then again Sunday afternoon will mainly be light and in the mountains, and be 0.10 or less.
Winds will continue to be gusty across the Kittitas Valley, Simcoe Highlands, Columbia Gorge and Oregon Columbia Basin and Oregon Blue Mountain Foothills. Winds will decrease through the day into tonight. Winds will increase again Saturday afternoon into Saturday evening and gust in the 25 to 35 mph range with gusts as high as 40 mph possible in these same general areas, before decreasing again on Sunday. Winds will increase again on Sunday afternoon, but should be a bit lower only into the 20s, possibly as high as 30 mph and not as widespread.
The wind advisory for the Kittitas Valley will remain in effect, otherwise it does look like that many areas will be close but just short and areal coverage of winds will be less today and decreasing during the day. The NBM probabilities of wind gusts >= 39 mph are generally 80 to 100% across most of the areas mentioned above.
However, the NBM probabilities of winds gusts >= 47 mph are 60 to 80% over a smaller area than on Thursday. So, again, will need to keep an eye on this, especially through the morning, but will not issue any new advisories at this time.
On Saturday, the NBM probabilities of wind gusts >=39 mph are high one again, 80 to 100%, but the probabilities of wind gusts >= 47 mph are much lower generally around 40 to 60%, with the exception of the Kittitas Valley which is still around 80 to 90%.
On Sunday, the NBM probabilities of wind gusts >= 39 mph are again 80 to 100%, but the probabilities of wind gusts >= 47 mph are even lower, and in a smaller area. Probabilities are Generally 30 to 50%, except for the Kittitas Valley.
With the passage of the trough, temperatures today and for the next few days will be about 10 degrees cooler than on Thursday and much closer to normal. Highs will be in the upper 60s to lower 70s over the area, today and Saturday then low to mid 60s to around 70 degrees on Sunday.
LONG TERM
Monday through Friday...Not much change in messaging for the forecast next week, as the PacNW looks to be enveloped by a trough pattern of some kind for most of the period. Ensembles continue to converge on a solution, making for relatively high confidence (70%) on the forecast.
The low currently impacting our area will begin to shift eastward on Monday, leaving the trough axis over the far eastern half of the forecast area with dry NNW flow aloft behind. The front associated with this trough axis may trigger some isolated showers and thunderstorms over the far eastern mountains, namely in Wallowa County, but the airmass throughout the weekend into Monday is dry, so PoPs are on the lower end (20-30%).
Tuesday into Wednesday, more widespread threats for shower activity develop as a low from the Gulf of Alaska dives down into our area.
Ensembles are in pretty good agreement on depicting this low, which would generate enough instability across the forecast area to generate showers through the midweek. Guidance is overall light on QPF this far out, as to be expected, but given the more NW origin of this system, combined with the drier center looking to fall just over central Washington, not expecting particularly impactful amounts of precip, but the setup is certainly there for on/off shower activity starting Tuesday and lasting into even early Thursday. Breezy winds will result from the arrival of this low, and some thunderstorms could pop up as well, primarily over the eastern mountains, however considering the cooler air this system is bringing in, not anticipating thunderstorm activity to be particularly strong at this time.
Ensembles continue to depict us under a trough pattern heading into the end of next work week. NBM paints slight chance to chance PoPs across the forecast area as a result. Expect temps to remain around or even slightly below seasonal averages, as colder, Canadian air is ushered in via this trough pattern. Evans/74
AVIATION
12z TAFs...VFR conditions expected, with gusty winds continuing across all sites through the period. Expect west winds gusting up to 30 kts at times, with winds expected to wind down by nightfall Friday night. Some light low to mid-level cloud cover early this morning will give way to clear skies during the day, before mid- level clouds start to build in again this evening. Evans/74
PRELIMINARY POINT TEMPS/POPS
PDT 64 39 67 39 / 0 0 0 10 ALW 67 44 69 44 / 0 0 0 10 PSC 72 45 73 45 / 0 0 0 10 YKM 69 38 69 38 / 0 0 0 0 HRI 69 43 72 43 / 0 0 0 0 ELN 63 41 63 40 / 0 0 0 0 RDM 65 34 67 33 / 0 0 0 0 LGD 60 36 67 38 / 0 0 0 10 GCD 63 36 69 36 / 0 0 0 0 DLS 67 44 67 45 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...None.
WA...Wind Advisory until 2 PM PDT this afternoon for WAZ026.
Area Forecast Discussion National Weather Service Pendleton OR 226 AM PDT Fri May 17 2024
SHORT TERM
Today through Sunday night...
Latest radar showed some light showers associated with upper trough and strong shortwave making its way across the region.
This trough and shortwave should continue moving eastward through the overnight hours and the main shortwave should be in Idaho by daybreak. Precipitation will linger over the mountains through the morning before ending. Today's precipitation will mainly be 0.10 inches or less, except along the crest of the Washington Cascades, which could receive up to 0.20 inches.
Friday afternoon into Friday night looks completely dry, then another trough and strong shortwave will drop southeastward from British Columbia and move across the Pacific northwest Saturday into Sunday, with a second shortwave moving sown Sunday night, which will further deepen the trough as it moves eastward.
Any precipitation that occurs, which will mainly be Saturday afternoon into Saturday night, then again Sunday afternoon will mainly be light and in the mountains, and be 0.10 or less.
Winds will continue to be gusty across the Kittitas Valley, Simcoe Highlands, Columbia Gorge and Oregon Columbia Basin and Oregon Blue Mountain Foothills. Winds will decrease through the day into tonight. Winds will increase again Saturday afternoon into Saturday evening and gust in the 25 to 35 mph range with gusts as high as 40 mph possible in these same general areas, before decreasing again on Sunday. Winds will increase again on Sunday afternoon, but should be a bit lower only into the 20s, possibly as high as 30 mph and not as widespread.
The wind advisory for the Kittitas Valley will remain in effect, otherwise it does look like that many areas will be close but just short and areal coverage of winds will be less today and decreasing during the day. The NBM probabilities of wind gusts >= 39 mph are generally 80 to 100% across most of the areas mentioned above.
However, the NBM probabilities of winds gusts >= 47 mph are 60 to 80% over a smaller area than on Thursday. So, again, will need to keep an eye on this, especially through the morning, but will not issue any new advisories at this time.
On Saturday, the NBM probabilities of wind gusts >=39 mph are high one again, 80 to 100%, but the probabilities of wind gusts >= 47 mph are much lower generally around 40 to 60%, with the exception of the Kittitas Valley which is still around 80 to 90%.
On Sunday, the NBM probabilities of wind gusts >= 39 mph are again 80 to 100%, but the probabilities of wind gusts >= 47 mph are even lower, and in a smaller area. Probabilities are Generally 30 to 50%, except for the Kittitas Valley.
With the passage of the trough, temperatures today and for the next few days will be about 10 degrees cooler than on Thursday and much closer to normal. Highs will be in the upper 60s to lower 70s over the area, today and Saturday then low to mid 60s to around 70 degrees on Sunday.
LONG TERM
Monday through Friday...Not much change in messaging for the forecast next week, as the PacNW looks to be enveloped by a trough pattern of some kind for most of the period. Ensembles continue to converge on a solution, making for relatively high confidence (70%) on the forecast.
The low currently impacting our area will begin to shift eastward on Monday, leaving the trough axis over the far eastern half of the forecast area with dry NNW flow aloft behind. The front associated with this trough axis may trigger some isolated showers and thunderstorms over the far eastern mountains, namely in Wallowa County, but the airmass throughout the weekend into Monday is dry, so PoPs are on the lower end (20-30%).
Tuesday into Wednesday, more widespread threats for shower activity develop as a low from the Gulf of Alaska dives down into our area.
Ensembles are in pretty good agreement on depicting this low, which would generate enough instability across the forecast area to generate showers through the midweek. Guidance is overall light on QPF this far out, as to be expected, but given the more NW origin of this system, combined with the drier center looking to fall just over central Washington, not expecting particularly impactful amounts of precip, but the setup is certainly there for on/off shower activity starting Tuesday and lasting into even early Thursday. Breezy winds will result from the arrival of this low, and some thunderstorms could pop up as well, primarily over the eastern mountains, however considering the cooler air this system is bringing in, not anticipating thunderstorm activity to be particularly strong at this time.
Ensembles continue to depict us under a trough pattern heading into the end of next work week. NBM paints slight chance to chance PoPs across the forecast area as a result. Expect temps to remain around or even slightly below seasonal averages, as colder, Canadian air is ushered in via this trough pattern. Evans/74
AVIATION
12z TAFs...VFR conditions expected, with gusty winds continuing across all sites through the period. Expect west winds gusting up to 30 kts at times, with winds expected to wind down by nightfall Friday night. Some light low to mid-level cloud cover early this morning will give way to clear skies during the day, before mid- level clouds start to build in again this evening. Evans/74
PRELIMINARY POINT TEMPS/POPS
PDT 64 39 67 39 / 0 0 0 10 ALW 67 44 69 44 / 0 0 0 10 PSC 72 45 73 45 / 0 0 0 10 YKM 69 38 69 38 / 0 0 0 0 HRI 69 43 72 43 / 0 0 0 0 ELN 63 41 63 40 / 0 0 0 0 RDM 65 34 67 33 / 0 0 0 0 LGD 60 36 67 38 / 0 0 0 10 GCD 63 36 69 36 / 0 0 0 0 DLS 67 44 67 45 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...None.
WA...Wind Advisory until 2 PM PDT this afternoon for WAZ026.
| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
| KPSC TRICITIES,WA | 4 sm | 43 min | WNW 06 | 10 sm | Clear | 52°F | 36°F | 54% | 29.85 | |
| KRLD RICHLAND,WA | 13 sm | 21 min | WSW 04 | 10 sm | Clear | 52°F | 36°F | 54% | 29.86 |
Pendleton, OR,
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