Marine Forecasts

    EDIT      (on/off)   Help

---

7 Day Forecast for Marine Location Near Kupreanof, AK

   Hourly   EDIT   Help

---

Area Discussion for -

      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXAK67 PAJK 072347 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 247 PM AKST Sun Mar 7 2021

SHORT TERM . /Through Monday night/ . A low well to the south that produced showers last night and yesterday remains nearly stationary near 50N and continues to rotate bands of showers as far north as the southern inner channels. Forecast thinking yesterday was that one more band of showers would impact Southeast Alaska tonight through Monday night. That band of showers is still in the forecast, but looking at today's model data, the source for that band does not appear to be the low to the south. A closer look reveals an upper level trough dropping south from the Yukon with a substantial amount of mid level vorticity. This is an interesting point of note for meteorologists, but is really just academic. The bottom line is that there will be showers developing over the central panhandle tonight and spreading south through Monday and Monday night. Models are consistent with regard to a colder low level airmass dropping south from the Yukon through this short term forecast period. In addition to decreasing high and low temperatures for the next couple days, the upcoming shower activity is also expected to produce measurable snowfall beginning tonight. Daytime temps tomorrow should transition the snow back to rain on Monday, but overnight lows Monday night will cause a transition back to snow where showers persist.

The low to the south and high pressure over the interior and northwest Canada will maintain a northerly pressure gradient. This will cause northerly small craft winds over Lynn Canal and northern Stephens Passage through Monday night. This plus the colder air coming from Canada will result in light freezing spray for Lynn Canal at night both tonight and Monday night.

As the shower activity moves off to the south, skies will begin to clear. Look for partly cloudy to mostly clear skies over the northern half of the Panhandle by Monday morning and over the southern half by Tuesday morning. That'll be my day off, so I think I'll go flight-seeing and maybe grab lunch in Sitka.

LONG TERM . /Tuesday through Sunday/ . Before the upper level trough moves out on Tuesday, mostly clear skies are expected across the panhandle during the day. Guidance has slowed the next weather system and will make it into the panhandle by early Wednesday with widespread precipitation in the afternoon. Once this system moves south Thursday, it may be followed by a weak atmospheric river impacting the southern panhandle. Models are optimistic and show another chance for dry weather and clear skies on Saturday.

Models have slowed the start of precipitation from our next system to early Wednesday morning. Precipitation will start in Yakutat, become widespread in the afternoon, and then move south. Winds will pick up with this front, and small craft advisories can be anticipated along the outer coast and inner channels. Snow possibilities for midweek are uncertain and could range up to advisory totals in areas including and north of Angoon and Juneau. The southern portion of the panhandle is forecasted to receive additional precipitation from a weak atmospheric river late on Thursday, though there is uncertainty on if the track of this system will move further south.

The long term precipitation forecast is a blend of GFS/NAM for Tuesday, and nudged to the GFS for the remainder of the week. This adjusted the surface weather front timing and speed. Temperatures for Friday and Saturday were trended down based on MOS and plume guidance. Overall confidence is moderate for temperature changes, but below average on which locations will see the most precipitation through the week.

AJK WATCHES/WARNINGS/ADVISORIES. PUBLIC . None. MARINE . Small Craft Advisory for PKZ012-013-022-031-041>043-051-052.



Fritsch/KRT

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
LCNA2 - Lincoln Rock, AK	48 mi	92 min	SE 8.9 G 14	44°F			1012.6 hPa	44°F
FFIA2 - Five Finger, AK	50 mi	42 min	NW 8 G 8.9	41°F			1013.7 hPa (+1.1)
CDEA2 - Cape Decision, AK	69 mi	80 min	Calm G 1	44°F			1013.4 hPa	35°F

Wind History for Port Alexander, AK

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

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

5 PM

6 PM

Last 24hr

N3

N4

N4 G8

N8 G14

N6 G13

N9 G15

N11 G15

N7 G16

N6 G16

N9 G16

N9 G17

N9 G15

N9 G15

N11 G18

N9 G17

N10 G15

N13 G19

N13 G20

N11 G15

N11 G17

N6 G13

N9 G16

N6 G11

N3 G6

1 day ago

SW6 G10

--

W1

S3 G8

--

S1

S2

S2

E2

--

--

S3 G6

NW2

NW2

NW1 G6

N2

S3 G9

N1

--

S1

--

NE1

SE1 G4

NE1 G4

2 days ago

N19 G25

N14 G21

N10 G25

N9 G17

NE9 G16

N2 G8

SE2 G6

NW2 G5

W2 G6

W3 G6

W4 G10

NW3 G6

--

--

S7 G14

S2 G10

--

N1 G4

S1

S4 G11

S3 G11

SW5 G8

S4 G8

S4 G7

---

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
Petersburg, AK	16 mi	46 min	S 4	10.00 mi	Partly Cloudy	36°F	32°F	86%	1014.6 hPa

Link to 5 minute data for PAPG

Wind History from APG (wind in knots)

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

5 PM

6 PM

Last 24hr

E5

E8

SE5

S5

N4

SE4

S5

SW3

S4

S3

Calm

Calm

Calm

Calm

Calm

NE3

E3

E4

E4

E4

E3

E3

SE3

S4

1 day ago

Calm

Calm

W3

W4

W3

SW3

Calm

W3

W3

W4

Calm

S3

Calm

W3

SW3

Calm

Calm

E8

SE7

SE5

5

E4

Calm

Calm

2 days ago

E5

S3

Calm

SE11 G16

SE10

SE14 G20

SE10 G27

SE10 G18

SE8 G22

SE10 G17

E15 G22

SE12 G26

E12 G23

S15 G25

SE10 G17

SE7

SE8 G15

SE6

3

3

Calm

S4

SW5

SW4

---

Tide / Current Tables for Castle Islands, Duncan Canal, Alaska

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

---

Tide / Current Tables for Wrangell Narrows (off Petersburg), Alaska Current

   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.

---