Petersburg, Alaska Weather Conditions

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Current Conditions

  • 59°
  • Scattered Clouds
  • Wind: ENE 5 mph
  • Humidity: 67%
  • Visibility: 10.0 miles
  • Dew Point: 48°
  • Pressure: 30.05 in. +

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Next 12 Hours

4  pm
7  pm
10  pm
1  am
4  am
Clear
Clear
Partly Cloudy
Partly Cloudy
Clear
Clear
Mostly Cloudy
Mostly Cloudy
Clear
Clear
55°
54°
50°
50°
50°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Rain Showers
  • High: 59 °
  • Low: 48 °
  • Rain Showers
  • Wednesday
  • Chance of Rain
  • High: 57 °
  • Low: 50 °
  • Chance of Rain
  • Thursday
  • Partly Cloudy
  • High: 57 °
  • Low: 50 °
  • Partly Cloudy
  • Friday
  • Chance of Rain
  • High: 57 °
  • Low: 54 °
  • Chance of Rain
  • Saturday
  • Chance of Rain
  • High: 57 °
  • Low: 52 °
  • Chance of Rain

Forecast for Petersburg, Alaska

Updated: 7:00 AM AKDT on September 02, 2014

  • Tuesday

    Partly cloudy with rain showers. Fog early. High of 59F. Winds less than 5 mph. Chance of rain 20%.

  • Tuesday Night

    Partly cloudy. Low of 48F. Winds less than 5 mph.

  • Wednesday

    Overcast with a chance of rain in the afternoon. High of 57F. Winds less than 5 mph. Chance of rain 20%.

  • Wednesday Night

    Overcast with a chance of rain. Low of 50F. Winds less than 5 mph. Chance of rain 50%.

  • Thursday

    Mostly cloudy. High of 57F. Winds less than 5 mph.

  • Thursday Night

    Partly cloudy. Low of 50F. Winds less than 5 mph.

  • Friday

    Overcast with a chance of rain. High of 57F. Winds less than 5 mph. Chance of rain 50%.

  • Friday Night

    Overcast with a chance of rain. Fog overnight. Low of 54F. Winds less than 5 mph. Chance of rain 50%.

  • Saturday

    Overcast with a chance of rain. Fog early. High of 57F. Winds from the SSE at 5 to 10 mph. Chance of rain 50%.

  • Saturday Night

    Overcast with a chance of rain. Low of 52F. Winds from the ESE at 5 to 10 mph. Chance of rain 70% with rainfall amounts near 0.5 in. possible.

  • Sunday

    Mostly cloudy with a chance of rain. High of 57F. Winds less than 5 mph. Chance of rain 30%.

  • Sunday Night

    Clear. Low of 48F. Winds less than 5 mph.

  • Monday

    Partly cloudy. High of 57F. Winds less than 5 mph.

  • Monday Night

    Overcast. Low of 48F. Winds from the NE at 5 to 10 mph.

  • Tuesday

    Partly cloudy. High of 57F. Winds less than 5 mph.

  • Tuesday Night

    Mostly cloudy. Low of 48F. Winds less than 5 mph.

  • Wednesday

    Overcast with a chance of rain. Fog early. High of 57F. Winds from the SSE at 5 to 10 mph. Chance of rain 20%.

  • Wednesday Night

    Mostly cloudy. Low of 48F. Winds from the SSE at 5 to 10 mph.

  • Thursday

    Mostly cloudy. Fog early. High of 55F. Winds from the SSE at 5 to 10 mph.

  • Thursday Night

    Mostly cloudy. Low of 48F. Winds from the SSE at 5 to 10 mph.

  • Friday

    Mostly cloudy. High of 55F. Winds from the SSE at 5 to 10 mph.

  • Friday Night

    Mostly cloudy. Low of 46F. Winds less than 5 mph.

  • Saturday

    Clear. High of 54F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Record Report  Statement as of 8:10 PM AKDT on September 1, 2014


... Record wet Summer for many areas of northern Southeast Alaska in
2014...

Locationnew record old record year set years of obs

Juneau Lena point 27.47 22.51 2006 32
Juneau Airport 24.18 21.57 1961 72
Haines Airport 16.31 15.93 1956 104
Haines downtown 16.87* 10.32 2008 15
Haines customs 11.11* 8.43 2009 26
Skagway Airport 10.55* 5.92 1998 17

* record reports for these stations may not be as meaningful as those
for stations with 30-year decadal normals (1981-2010).

Note... climatological Summer is defined as the months of
June... July... and August.

Rwt Sep 14


Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Papke's Landing, Petersburg, AK

Updated: 3:40 PM AKDT

Temperature: 57.0 °F Dew Point: 54 °F Humidity: 91% Wind: Calm Pressure: 30.12 in Hourly Precipitation: - Graphs

NWS Forecaster Discussion




Southeast Alaska forecast discussion 
National Weather Service Juneau Alaska 
331 PM akdt Tuesday Sep 2 2014 


Short term...a weak ridge extends from the surface aloft and 
covers the eastern Gulf and Panhandle. An upper trough is pushing 
east across the far northern Gulf and the effects can be seen in 
both radar data as well as satellite imagery as an area of 
showers. Currently no rain is falling over land sites, but 
movement of the clouds suggests that showers will arrive in 
Yakutat by early evening. A thin but well defined band of precipitation 
on the radar off the central outer coast should arrive over land 
around the same time, but may fall as virga without registering 
at the surface. As the trough continues to the east, scattered 
showers will develop from northwest to southeast over much of 
Southeast Alaska through Wednesday afternoon. 


No major airmass changes expected tonight and the lowers levels of 
the atmosphere remain stable. Given that, am expecting another 
night of low clouds and fog to form over most of the Panhandle. 
Have not issued any dense fog advisories with the afternoon 
forecast, but cannot rule this out based on last night. Clearing 
expected by late morning or early afternoon. 


Weak preswure gradient over the Panhandle...except for the far 
northern Inner Channels. Winds over northern Lynn Canal are at 
marginal small craft levels out of the south and Skagway winds 
have been the upper teens with gusts to the middle 20s. These winds 
will diminish by late evening. No significant winds elsewhere on 
teh inside. Offshore, southwesterly winds 15 to 20 kts up and down 
the entire coast will pile up seas along the shore and there are 
some small craft seas in the forecast. Swell out of the west or 
southwest with periods generally 8 seconds. 


A very weak onshore gradient exists from the surface up to 850 mb. 
There will be some very weak warm air advection, so overnight lows 
along the outer coast should a degree or two higher than last 
night. With the expected low clouds and fog in store for much of 
tomorrow, daytime highs should be very much like today. 


Used a NAM/European model (ecmwf) blend for tonight, then a NAM/Gem blend for 
tomorrow for pressure and wind. Pop and quantitative precipitation forecast from NAM and Gem. 
Temperatures per bias corrected NAM and European model (ecmwf). Forecast confidence is 
average. 


Long term...region to remain generally quiet under weak flat 
ridging aloft Thursday through early Friday evening but will be 
affected by waves along the storm track from Friday onwards. On 
Friday weak moisture advection and some thermal forcing should lead 
to some scattered shower activity over the area, concentrated on 
northern portions. Northwest portions will likely see some areas 
of moderate rain with this disturbance...and some rain will spread 
southeastward to the southern Panhandle on Saturday. Do not 
anticipate significant rain amounts with this system except for 
some isolated areas of the northwest. However the GFS shows this 
system stalling on Saturday night with persistent areas of rain on 
the south side and some evidence of a weak frontal passage moving 
south and east on Sat. GFS stronger than European model (ecmwf) with this system. Coastal 
areas of most of County Warning Area...at least...expected to be wet during this 
time. Gradients generally weak with the system overall though so 
winds not expected to be a big problem. 


A secondary trough developing behind the weekend wave will likely reinforce 
lift and shower production by early Sunday as new closed low system 
develops and progresses southeastward through the region late on 
Saturday and Sunday. European model (ecmwf) is weaker and slower with this new 
upper trough. GFS has this system quickly replaced by upper 
ridging on Monday as a new stronger trough approaches from the 
Bering Sea...models diverge at this point. Ridging will likely be 
transient and moisture from the new system appears likely to get 
here late on Tuesday. Went with likely probability of precipitation on Tuesday for now but we 
will see how the timing plays out. 


NAM/GFS grids in general agreement through 84h then settled on a 
GFS/European model (ecmwf) blend after that point...as models diverge by early 
week...with grids selected in line with wpc. Forecast confidence 
level is average overall with this package. 




&& 


Aviation...very low ceiling and areas of fog below minimums 
expected for portions of the Panhandle tonight will impact 
aviation operations overnight and through at least middle morning. 
Little to no turbulence expected below 10k feet. 


&& 


Ajk watches/warnings/advisories... 
public...none. 
Marine...Small Craft Advisory for pkz012. 
Small Craft Advisory due to seas for pkz041>043-051-052. 


&& 


$$ 


Fritsch/Wesley/ahn 


Visit US at http://www.Weather.Gov/Juneau 



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