Marine Weather and Tides
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.
|Sunrise 6:44AM||Sunset 6:53PM||Thursday September 23, 2021 5:43 PM PDT (00:43 UTC)||Moonrise 8:20PM||Moonset 9:31AM||Illumination 93%|
7 Day Forecast for Marine Location Near Boardman, ORHourly EDIT Help
Area Discussion for - Pendleton, OR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS66 KPDT 232358 AFDPDT
Area Forecast Discussion . Updated National Weather Service Pendleton OR 458 PM PDT Thu Sep 23 2021
Updated aviation discussion
SHORT TERM. TODAY THROUGH SATURDAY . Current radar and visible satellite imagery showing clear to mostly clear skies across the region as an upper level ridge continues to push onshore and build across the Pacific Northwest today and into Friday. Sunny skies, warmer temperatures, and low winds will accompany this building ridge. However, there will be the potential for some breezy north- northwesterly winds between 10-20 mph through the Kittitas Valley this afternoon/evening. This is a result of tightening isobars between the departing trough to our east and the building ridge to our west-southwest, but winds will subside late this evening and stay calm through the day on Friday. The ridge begins to break down Friday evening and flatten as a weak shortwave trough moves through Saturday. This will provide breezy conditions through the Eastern Gorge and Kittitas Valley as gusts of 20-30 mph will be possible through the afternoon/evening on Saturday. As this shortwave trough passes through our area Saturday, a strong upper level trough located in the Bering Sea will begin to strengthen and dig south into the North Pacific before eyeing the Pacific Northwest early in the workweek. Saturday will be a transition day, with zonal west flow aloft turning more from the southwest through the day. This produces mostly clear skies and the warmest day in the forecast, as highs will peak in the low to upper 80s for lower elevations and low to mid 70s for the mountains. 75
LONG TERM. SUNDAY THROUGH WEDNESDAY . A strong upper level trough originating from the Gulf of Alaska will continue to dig through the Northern Pacific and along the west coast as it nears the Pacific Northwest coast on Sunday. By Sunday afternoon, the leading edge of the trough approaches the Washington and Oregon coasts. This system will continue east overnight into Monday morning, initiating showers along the Cascades during the early morning hours Monday before moisture spills east of the Cascades and through our area late Monday into Tuesday. This is a slow mover as the system slows its eastward progression to dig along the coast. The presence of the jet stream parallel to the associated cold front will further slow down the system as it progresses into and through our area. This results in moisture finally pushing east of the Cascades Monday afternoon and continuing to provide widespread showers. The trough axis passes through the area Tuesday afternoon/evening before slowly lifting to our northeast Wednesday afternoon. Rain chances begin to diminish across lower elevations by late Tuesday morning before drying over the Cascades and the Blues late Tuesday into Wednesday morning. Models diverge significantly Wednesday as ridging occurs in the wake of the departing system. What is in question is how quick this ridge builds, how long it lingers, and how strong it builds up ahead of the next system that looks to infiltrate into the Pacific Northwest Thursday/Friday.
Guidance is in fairly good agreement with the overall pattern, at least early in the extended period, although differences in trough timing and strength exist. The ECMWF incurs a stronger, deeper, and later incoming trough early in the workweek. This leads to a greater potential for breezy winds but an overall drier outcome than with GFS. The real divergence between models comes as the trough is passing through and exiting our area Wednesday and Thursday. The ECMWF builds a weak ridge on the heels of the trough Wednesday morning, whereas the GFS builds a much stronger ridge Wednesday afternoon/evening. This leads to the next system moving in earlier Thursday morning with the ECMWF and providing widespread showers versus a later and weaker trough late Thursday into Friday morning as with the GFS.
Variability between guidance is apparent when observing the 500 mb EOF patterns as the percent variance between ensembles grows considerably from Sunday through Tuesday associated with the passing trough. The divergence has to do primarily with strength, location, and how quickly the system exits to our east late Tuesday/Wednesday. The cluster phase space highlights slightly more confidence with the ECMWF Monday with a tighter ensemble grouping and closer and more representative deterministic/ensemble mean. Confidence becomes more marginal Tuesday as forecast confidence begins to shift more toward the GFS as the cluster phase shows discrepancies between the ECMWF deterministic and ensemble means, however there is still more inherent spread with the GEFS. The cluster phase then hints at more confidence in the ECMWF into Wednesday, leading to a weak, brief, and earlier upper level ridge Wednesday morning versus the GFS's ridge building overnight Wednesday into Thursday morning. Current forecast reflects this initial ECMWF-heavy scenario before transitioning to more of a GFS outcome midweek. 75
AVIATION. 00Z TAFs . VFR conditions remain over the area this afternoon and will continue through the next 24 hours. FEW-SCT cirrus above 20K feet this afternoon will clear overnight then return in the late morning and afternoon tomorrow. Generally north to northwest winds around 5 KTS this afternoon will switch to the usual nighttime drainage directions overnight. Winds will become north to northwesterly at 4-8 KTS after 18Z though western sites KDLS and KYKM will be east to southeasterly. 83
PRELIMINARY POINT TEMPS/POPS. PDT 45 81 51 84 / 0 0 0 0 ALW 47 81 54 85 / 0 0 0 0 PSC 49 83 54 86 / 0 0 0 0 YKM 46 80 50 85 / 0 0 0 0 HRI 45 83 51 87 / 0 0 0 0 ELN 45 78 50 82 / 0 0 0 0 RDM 38 84 43 85 / 0 0 0 0 LGD 41 80 48 83 / 0 0 0 0 GCD 43 84 45 85 / 0 0 0 0 DLS 51 85 55 86 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None.
SHORT TERM . 75 LONG TERM . 75 AVIATION . 83
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|Hermiston, Hermiston Municipal Airport, OR||23 mi||50 min||N 5||10.00 mi||Fair||80°F||48°F||33%||1020.8 hPa|
Link to 5 minute data for KHRI
Wind History from HRI (wind in knots)
|1 day ago||Calm||Calm||SW||S||SW||S||S||S||SE||Calm||Calm||S||Calm||S||N||SW||W||W|
|2 days ago||NE||NE||E||SE||SE||SE||E||E||SE||SE||Calm||Calm||SE||Calm||Calm||S||Calm||S||N||NE||NE||NE||NE||NE |
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