Marine Forecasts

    EDIT      (on/off)   Help

---

7 Day Forecast for Marine Location Near Kasaan, AK

   Hourly   EDIT   Help

---

Area Discussion for -

      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXAK67 PAJK 212241 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 241 PM AKDT Wed Apr 21 2021

SHORT TERM. Clear skies and no precipitation will continue for this short term forecast period. Daytime highs will trend a few degrees above normal for this time of the year, but still feel cool compared to last weekend and earlier this week. The clear skies will also allow for overnight lows to fall below freezing for most locations tonight, which is a few degrees below normal. Highs and lows will both trend gradually warmer through the short term period. High pressure over the Yukon will act in conjunction with an inverted trough oriented along the long axis of the Panhandle to maintain a moderate strength northerly pressure gradient. Small craft winds over Lynn Canal this afternoon will diminish overnight and remain in the 15 to 20 kt range through Thursday as the gradient relaxes slightly, but jump back up to 25 kts late Thursday night and much of Friday. Daytime sea breezes are not expected to fully develop in Haines or Skagway, but merely act to diminish the northwesterly/northeasterly wind speeds.

A significant marine layer is not expected to reform tonight. However, fog was included for Yakutat owing to the fact that the dewpoint did not fall there all day today and the forecast low will get well below the current dewpoint value. Elsewhere, afternoon dewpoint spreads are considered sufficient to preclude fog tonight. If anything, some frost may form.

Minimal changes were made to the previous forecast apart from cooling the overnight lows tonight under clear skies. Forecast confidence is above average.

LONG TERM. /Fri through Wed as of 10 pm Tue/ Much of the extended range period is dominated by a strong blocking upper ridge over interior Alaska that does not move all that much through the period. It is not until early next week that any signs of significant change shows up and that comes in the form of the ridge weakening and getting pushed W. The cause of this change is two strong upper lows (one moving W from the Canadian Arctic, and one moving E from the Southern Bering Sea) that will result in a general upper trough over the state by the middle of next week. Some uncertainty on timing and how the pattern change exactly plays out so confidence for early next week is low.

So what does that mean for the panhandle? For the most part it means dry and mostly clear weather continues through the weekend at least as offshore flow dominates. The main change to the forecast was for Fri through Sun with an increase in offshore winds across the northern inner channels. Surface pressure will be decreasing in the Gulf and southern panhandle starting on Fri while high pressure remains nearly steady in the Yukon. Pressure gradients along the coast mountains will increase (up to 2.5 to 3.5 mb forecast between Juneau and Skagway by Fri night and into Sat), and northerly winds should respond (winds increased to 15 to 25 kt for Lynn Canal, parts of Stephens Passage, and even Cross Sound at that time). Winds should start to diminish Sun as the Yukon high weakens, but timing on the diminishing trend is a little uncertain due to the uncertainty with the start of the upper level pattern change early next week.

Precip is expected to start to return to the forecast next week, but the timing of that is rather low confidence. This mainly stems from the uncertainty in the upper level pattern shift for early next week. Precip onset ranges from as early as Sun night to as late as Tue with ensemble means trending toward the later timing currently. They also differ on which direction it will be coming from (some suggest an easterly wave while others are trending toward a front from the S). We will continue to watch this develop.

AJK WATCHES/WARNINGS/ADVISORIES. PUBLIC . None. MARINE . Small Craft Advisory for PKZ012-013-031-033-043-051-052.



FCF/BFL/EAL

Visit us at http://www.weather.gov/Juneau

---

Weather Reporting Stations

   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
SPXA2	26 mi	28 min	N 5.1 G 9.9				1020.5 hPa
GIXA2	26 mi	22 min	NE 1.9 G 7	46°F			1019.9 hPa	35°F
KEXA2	33 mi	32 min	S 1.9 G 5.1				1020.3 hPa
SLXA2	35 mi	29 min	ENE 4.1 G 8	39°F			1019.4 hPa	30°F
KECA2 - 9450460 - Ketchikan, AK	36 mi	56 min	Calm G 4.1	40°F	46°F		1023 hPa (-0.3)
SXXA2	38 mi	28 min	ENE 1.9 G 6	40°F			1020.5 hPa	32°F
CRGA2	47 mi	32 min	ENE 1 G 4.1	41°F			1023.4 hPa	32°F
LCNA2 - Lincoln Rock, AK	60 mi	46 min	WSW 13 G 17	44°F			1022.5 hPa	44°F

Wind History for Ketchikan, AK

(wind in knots)    EDIT      (on/off)   Help

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

-12 PM

5 PM

6 PM

7 PM

8 PM

9 PM

10 PM

11 PM

12 AM

1 AM

2 AM

Last 24hr

NW4 G9

NW4 G9

NW7 G12

NW4 G9

W7

NW7 G13

W13 G17

NW12 G19

NW11 G25

NW11 G21

NW4 G10

NW17 G21

NW10 G19

NW6 G15

NW7 G11

NW5 G10

N2 G7

N3 G7

NW3 G6

N5 G8

NW4

--

E2

1 day ago

SE1

--

--

S1

--

SE4

NW12 G16

NW14

NW11 G16

W18

NW15 G19

NW17 G21

NW13 G16

NW8 G15

W10

NW6 G15

NW8 G12

NW6 G12

NW5 G10

NW5 G9

NW8 G16

NW11 G16

NW12 G20

NW9 G18

2 days ago

--

N1

W2

--

NW2

E1

NW1

NW2

SE5

NW3

SE7

SE6

SE5

SE6

SE1

--

W2

NW3 G8

E3

SE1

--

--

---

Airport Reports

    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.

Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Hydaburg - Hydaburg Seaplane Base, AK	27 mi	60 min	N 0	10.00 mi	Fair	36°F	33°F	89%	1023.2 hPa

Link to 5 minute data for PAHY

Wind History from AHY (wind in knots)

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

12 AM

1 AM

2 AM

3 AM

Last 24hr

NW4

--

Calm

NW8

W8

W9

NW13

--

NW12

NW10

NW12

--

NW14

NW16

NW13

NW11

NW10

NW5

Calm

N3

Calm

--

Calm

Calm

1 day ago

W8

NW5

NW7

NW7

NW6

NW6

NW5

NW7

SW4

NW10

SW7

NW10

NW12

SW6

NW10

NW13

NW9

NW6

NW9

NW8

NW9

NW8

--

W6

2 days ago

Calm

Calm

Calm

Calm

Calm

Calm

--

W3

SW6

--

SW6

SW3

--

SW6

SW7

--

Calm

Calm

NW9

NW5

NW4

NW3

NW3

Calm

---

Tide / Current Tables for Divide Head, Cholmondeley Sound, Alaska

   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data

---

Tide / Current Tables for Saltery Cove, Skowl Arm, Kasaan Bay, Alaska

   EDIT      (on/off)   Help   One Week of Data

---

Weather Map

       (on/off)   Help Weather Map

---

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.

---