Tuesday, April13, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
Cascade Locks, OR

Version 3.4
NOTICE
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 6:26AMSunset 7:53PM Monday April 12, 2021 9:53 PM PDT (04:53 UTC) Moonrise 6:03AMMoonset 7:38PM Illumination 1% Phase: Waxing Crescent; Moon at 1 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
    EDIT      (on/off)   Help


7 Day Forecast for Marine Location Near Cascade Locks, OR
   Hourly   EDIT   Help
location: 45.68, -121.87     debug


Area Discussion for - Portland, OR
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS66 KPQR 130403 AAB AFDPQR

Area Forecast Discussion National Weather Service Portland OR 901 PM PDT Mon Apr 12 2021

SYNOPSIS. High pressure over the region will maintain dry weather this week, with mild days and cool nights. Locally breezy offshore flow will persist through Wednesday, resulting in unseasonably dry conditions and elevated fire danger. Temperatures will trend warmer for the remainder of the week, potentially testing record highs by the weekend.

SHORT TERM. Tonight through Wednesday . Latest GOES-West imagery reveals a cloudless sky across western WA/OR this evening. Offshore flow has been robust throughout the day, with gusts 25-35 mph common at our airport weather stations. Synoptic-scale offshore MSLP gradients are in the process of ramping up as high pressure builds into the Columbia Basin, so tonight should remain breezy to locally windy in the high terrain and through the Columbia Gorge. Given the very dry air mass with inland dewpoints mostly in the upper teens and 20s, any location where winds drop off considerably overnight will see a rapid drop in temperature, likely approaching freezing or falling slightly below yet again later tonight/Tuesday morning. That said, forecasting overnight low temperatures will be challenging tonight and Tuesday night as some locations will maintain a breeze and fail to decouple, thus staying well above freezing. We adjusted the low temperature forecasts for tonight and Tuesday night downward, closer to MOS guidance in general and well below NBM deterministic guidance in most cases. Despite temps dipping below freezing in our colder valley locations, we do not expect much frost due to the dry conditions.

One item that grabbed our attention a bit this evening was the very strong wind gusts shown by MOS guidance, particularly in the Willamette Valley. Latest GFS LAMP guidance has been suggesting north-northeasterly gusts 40-50 mph reaching down into Portland, Salem, and Eugene Tuesday afternoon, despite KOTH-KGEG MSLP gradients of "only" -12 to -14 mb and KTTD-KDLS gradients of around -3 mb. Even disregarding the weak KTTD-KDLS gradients and considering this the synoptic-scale event that this is, there is a bit of a disconnect between these gradients and the high-end wind gusts shown by MOS. Meanwhile, high-res NAM Nest and UW WRF guidance suggest the strongest winds remain above valley inversions Tuesday morning, relegating them to the higher terrain in the morning. Mixing will improve during the day Tuesday, but at the same time, models weaken the winds aloft. Additionally, UW 4km ensemble shows sustained winds peaking in the 15-20 kt range Tuesday afternoon, much less than the 30-35 kt sustained shown by the GFS LAMP. Therefore we will hold winds well below MOS guidance and closer to NBM and 18z EC ensemble guidance, but will need to watch this closely to make sure the strong winds aloft don't linger later into Tuesday when they would have a better chance of mixing down to the Willamette Valley floor.

The robust offshore flow and dry air mass will allow temperatures to warm rapidly after chilly morning lows Tuesday and again Wednesday. In this type of scenario, the coast often ends up the warmest due to an additional round of downsloping and compressional warming to the lee of the Coast Range. As such, would not be surprised to see temps break 70 degrees along the coast Tuesday and/or Wednesday. Offshore flow appears to slacken a bit going into Wednesday, potentially allowing a seabreeze to cool off the beaches beginning around midday Wednesday and continuing into the afternoon.

Given the warm afternoon temperatures, breezy offshore winds, and very dry air mass, fire danger will be unseasonably high as fine fuels continue to dry out in what has been a very dry April. Fortunately, heavier fuels remain seasonally moist and there is plenty of snowpack at elevations above 2500-3000 feet. But anyone planning to burn slash piles or yard debris should be especially careful through at least midweek, as these conditions do make it possible for finer fuels to carry fire despite it being well before our typical fire season. Weagle

LONG TERM. Thursday through Sunday . Pacific NW will remain dry throughout the week and into the weekend. The low that moved south Tuesday will continue to move southeast into the Great Basin, maintaining light to moderate offshore flow Thursday. Upper level high pressure will build in behind the low maintaining dry conditions as well as allowing the thermal low to build to the south continuing the offshore flow into the weekend. With conditions remaining dry, expect cool nights and warm afternoons to continue. Longer range NBM guidance suggests we could push 80 degrees as we head into the weekend. Weagle/BKP

AVIATION. Upper level high pressure over the northeast Pacific and Canada along with a thermally induced lower pressure along the northern California and southern Oregon coast will lead to dry north to northeasterly flow and VFR conditions areawide through 12Z Wednesday. There is the possibility of some LLWS developing after 06Z Tuesday through 15Z Tuesday for locations within the northern Willamette Valley, with a stronger likelihood for areas near the mouth of the Columbia River Gorge. Expect north to northeasterly wind gusts of 15 to 25 kt to develop in the afternoon through the early evening hours again on Tuesday, particularly along the coast and in the Willamette Valley.

For detailed regional Pac NW aviation weather information, go online to: https://weather.gov/zse

KPDX AND APPROACHES . Upper level high pressure over the northeast Pacific and Canada along with a thermally induced lower pressure along the northern California and southern Oregon coast will lead to VFR conditions at the terminal through 12Z Wednesday. Most high resolution models show the gusty east winds giving way to westerly winds between 04Z Tuesday and 06Z Tuesday before returning again between 18Z Tuesday and 20Z Tuesday. There is the possibility for some LLWS to develop between 06Z Tuesday and 10Z Tuesday. /42

MARINE. High pressure currently over the northeast Pacific is expected to remain in place for much of the next week. Thermally induced lower pressure along the southern Oregon coast will gradually spread northward resulting in a summer-like gusty northerly wind pattern across the coastal waters through Tuesday. The pattern weakens on Wednesday as the thermally induced lower pressure along the coast shifts inland thereby easing winds some. However, northerly winds continue through late in the week as surface high pressure remains offshore and the thermally induced lower pressure rebuilds along the coast. There is a chance a southerly wind reversal could bring a brief bout of gusty southerly winds and fog to the waters over the weekend, but plenty of uncertainty exists at this point if it will occur and how pronounced it will be if it does.

Seas are currently hovering around 6 to 8 ft range across the waters as a northwesterly swell dissipates. Winds will continue to be out of the northeast, but observations are showing that winds over the waters are continuing to weaken. As a result have adjusted the current Small Craft Advisories to more accurately reflect current observations and incorporate the most current guidance available this evening. However, strengthening northerly winds Tuesday afternoon and evening will bring an increasing wind wave component to the seas. As a result, seas may become particularly steep and hazardous as dominant wave periods fall into the 6 to 8 second range across the waters. Seas should generally be 5 ft or less beginning during Wednesday and continuing through at least the weekend. /Neuman/42

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory until 1 AM PDT Tuesday for Waters from Cape Shoalwater WA to Cascade Head OR from 10 to 60 NM.

Small Craft Advisory until 10 PM PDT this evening for Coastal waters from Cape Shoalwater WA to Cascade Head OR out 10 NM.

Small Craft Advisory until 6 AM PDT Wednesday for Waters from Cascade Head to Florence OR from 10 to 60 NM.

Small Craft Advisory until midnight PDT tonight for Coastal waters from Cascade Head to Florence OR out 10 NM.



Interact with us via social media: www.facebook.com/NWSPortland www.twitter.com/NWSPortland


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
On 03/09/2021 the NDBC primary processing servers were shut off due to a facilities issue. Station pages on the NDBC website are not updating and there is no ETR at this time. We will update this banner as we learn more.
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 65 mi60 min 49°F1021.4 hPa

Wind History for Longview, WA
(wind in knots)    EDIT      (on/off)   Help
Last
24hr
1 day
ago
2 days
ago

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KCZK

Wind History from CZK (wind in knots)
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last 24hr24------------------------SW12
G20
SW6W6----SW65SW5
G15
5SW11
G18
1 day ago53------------------------322SW632SE2E21S2
2 days ago----------------------------1214334434

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Vancouver
Click for Map
Tue -- 04:16 AM PDT     0.24 feet Low Tide
Tue -- 06:27 AM PDT     Sunrise
Tue -- 07:26 AM PDT     Moonrise
Tue -- 08:43 AM PDT     1.78 feet High Tide
Tue -- 04:47 PM PDT     -0.07 feet Low Tide
Tue -- 07:55 PM PDT     Sunset
Tue -- 09:19 PM PDT     1.49 feet High Tide
Tue -- 09:45 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
10.90.70.50.20.30.71.31.71.81.61.210.80.60.30-0.10.20.71.21.51.41.2

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
   EDIT      (on/off)   Help   One Week of Data
Knappa
Click for Map
Tue -- 03:16 AM PDT     8.26 feet High Tide
Tue -- 06:30 AM PDT     Sunrise
Tue -- 07:28 AM PDT     Moonrise
Tue -- 10:25 AM PDT     -0.00 feet Low Tide
Tue -- 04:02 PM PDT     7.19 feet High Tide
Tue -- 07:59 PM PDT     Sunset
Tue -- 09:50 PM PDT     Moonset
Tue -- 10:17 PM PDT     1.51 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
3.75.77.38.2875.53.72.10.80.10.21.43.25.16.67.26.85.84.43.12.11.51.8

Weather Map
       (on/off)   Help Weather Map
wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.