Petersburg, Alaska Weather Conditions

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Current Conditions

  • 45°
  • Mostly Cloudy
  • Wind: Calm
  • Humidity: 87%
  • Visibility: 10.0 miles
  • Dew Point: 41°
  • Pressure: 29.56 in. +

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Next 12 Hours

10  am
1  pm
4  pm
7  pm
10  pm
Rain Showers
Rain Showers
Chance of Rain
Chance of Rain
Chance of Rain
Chance of Rain
Chance of Rain
Chance of Rain
Overcast
Overcast
46°
48°
48°
45°
41°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Thursday
  • Chance of Rain
  • High: 50 °
  • Low: 39 °
  • Chance of Rain
  • Friday
  • Chance of Rain
  • High: 48 °
  • Low: 37 °
  • Chance of Rain
  • Saturday
  • Partly Cloudy
  • High: 48 °
  • Low: 34 °
  • Partly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 45 °
  • Low: 36 °
  • Partly Cloudy
  • Monday
  • Partly Cloudy
  • High: 45 °
  • Low: 32 °
  • Partly Cloudy

Forecast for Petersburg, Alaska

Updated: 7:00 AM AKDT on October 23, 2014

  • Thursday

    Overcast with rain showers, then a chance of rain in the afternoon. Fog early. High of 50F. Winds from the East at 5 to 15 mph. Chance of rain 30%.

  • Thursday Night

    Overcast with a chance of rain in the evening, then partly cloudy. Low of 39F. Winds less than 5 mph.

  • Friday

    Overcast with a chance of rain. High of 48F. Winds less than 5 mph. Chance of rain 70%.

  • Friday Night

    Mostly cloudy. Low of 37F. Winds from the ENE at 5 to 10 mph.

  • Saturday

    Partly cloudy in the morning, then clear. High of 48F. Winds from the NE at 5 to 10 mph.

  • Saturday Night

    Partly cloudy in the evening, then clear. Low of 34F. Winds from the NE at 5 to 10 mph.

  • Sunday

    Partly cloudy. High of 45F. Winds less than 5 mph.

  • Sunday Night

    Mostly cloudy in the evening, then overcast. Low of 36F. Winds less than 5 mph.

  • Monday

    Partly cloudy. High of 45F. Winds less than 5 mph.

  • Monday Night

    Clear. Low of 32F. Winds from the NE at 5 to 10 mph.

  • Tuesday

    Clear. High of 46F. Winds from the NE at 5 to 10 mph.

  • Tuesday Night

    Mostly cloudy with a chance of rain. Low of 36F. Winds from the ENE at 5 to 10 mph. Chance of rain 20%.

  • Wednesday

    Overcast with a chance of rain. High of 43F. Winds from the East at 5 to 15 mph. Chance of rain 70% with rainfall amounts near 0.3 in. possible.

  • Wednesday Night

    Overcast with a chance of rain. Low of 39F. Winds from the ENE at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.6 in. possible.

  • Thursday

    Overcast with a chance of rain. High of 45F. Winds from the East at 5 to 10 mph. Chance of rain 40%.

  • Thursday Night

    Overcast with a chance of rain. Low of 39F. Winds from the ESE at 5 to 10 mph. Chance of rain 40%.

  • Friday

    Mostly cloudy with a chance of a thunderstorm. High of 45F. Winds from the ESE at 5 to 10 mph. Chance of rain 20%.

  • Friday Night

    Partly cloudy. Low of 39F. Winds from the SE at 5 to 10 mph.

  • Saturday

    Clear. High of 46F. Winds from the SE at 5 to 10 mph.

  • Saturday Night

    Partly cloudy. Low of 39F. Winds from the ESE at 5 to 10 mph.

  • Sunday

    Partly cloudy. High of 46F. Winds from the ESE at 10 to 15 mph.

  • Sunday Night

    Clear. Low of 39F. Winds from the ESE at 5 to 15 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Papke's Landing, Petersburg, AK

Updated: 10:28 AM AKDT

Temperature: 46.0 °F Dew Point: 46 °F Humidity: 98% Wind: SSW at 1.1 mph Pressure: 29.66 in Hourly Precipitation: - Windchill: 46 °F Graphs

NWS Forecaster Discussion




Southeast Alaska forecast discussion 
National Weather Service Juneau Alaska 
430 am akdt Thursday Oct 23 2014 


Short term...satellite imagery this morning showing two 985 mb 
low pressure systems in the norther Pacific rotating around each 
other. The low located west of haida gwaii will affect our area 
with a weak frontal band currently over the southern Panhandle 
moving northward. This low will continue to progress westward 
merging with the the second low later in the day. The resulting 
circulation will weaken as it moves off the coast of haida gwaii 
again and become quasi stationary. 


Clear breaks over the northern Panhandle due to offshore flow has 
resulted in fog development for locations north of Frederick Sound 
and temperatures dropped down to freezing due to radiational cooling. 
Local visibilities have dropped below 1 mile at times. Clouds will 
increase through the morning as the front advances northward. 
Rain showers over the southern Panhandle have been light but do 
expect more shower bands to move over the southern region today 
and again tonight as the reformed low moves back near haida gwaii. 
Showers will develop over the central and northern Panhandle later 
in the day as front moves north. The front will be shearing apart 
while it moves north and forcing mechanisms weaken so showers will 
be scattered. With cooler air aloft and warm sea surface 
temperatures producing convective atmosphere with cape around 200 
to 400 j/kg and lifted index of 0 to -2c south of the low center so have 
included slight chance of thunder storms over the Southeast Alaska Gulf. 


Over the southern coastal waters small craft winds and seas around 
10 feet will diminish through the morning as the low pulls off to the 
west. Winds and seas will pick up again late tonight as the 
reformed low moves back in. Northerly small craft winds over 
northern and southern Lynn Canal early this morning due to 
pressure gradient between the low in the southeast Gulf and high pressure 
over the Yukon. Elsewhere winds in the 20 knots range with some 
easterly gap and outflow winds between the southeast Gulf low and high 
over British Columbia. Winds will weaken through the morning as the low 
pulls off the west. Weak gradient tonight will result in winds 
generally less than 15 kts but with increasing winds over the far 
southern Panhandle as the reformed low nears haida gwaii. 


Models have not been handling these two low pressure systems in 
the North Pacific very well so forecast confidence is below average. Lots of 
shifting in strength and position of the low centers as they rotate 
around each other. Model choice was mainly picking ones that were 
in better agreement and have shown less change run to run. Decided 
to use a blend of 00z European model (ecmwf)/NAM for the short term forecast which 
did shift the low back east slightly this morning and altered some 
wind speeds. Models also had a large spread in timing precipitation bands 
so went with a blend of NAM/GFS/sref, with bit more confidence in 
the NAM. 


Long term...Middle Range models struggle a little on Friday into 
Saturday as the consolidating low becomes quasi-stationary near the 
coast of haida gwaii in conjunction of another weak low forming 
over the northern Gulf on Saturday. A surface trough will become a 
bit active through the weekend between the northern Gulf low and 
the low off the coast of haida gwaii. Scattered showers will 
continue along the trough Saturday...then expect increasing 
offshore low level flow across the northern areas for generally 
dry weather Sunday while the southern areas stay under scattered 
showers. None of the model solutions given for Friday and Saturday 
handles the synoptic pattern well. Decided to make a temporal 
transition from the short term forecast of NAM and European model (ecmwf) based 
solutions and made smooth connection to the wpc ensemble guidance 
Sunday Onward. 


Models continue diverting for next week as they handle the 
Tropical Storm Ana...currently moving slowly north-northwestward 
over northwest of Hawaii. The jtwc predicts Ana will weaken and 
re-curve northeastward by Friday morning near 30n/170w...then 
heading toward haida gwaii through Monday evening. Ana will 
continue to weaken and become an extratropical system by Sunday 
evening. The wpc ensemble solution will keep the extratropical 
system moving over haida gwaii with wet weather across the 
southern Panhandle Tuesday and Wednesday. No significant 
winds/seas are expected...except Friday night when the near- 
stationary low off the coast of haida gwaii produces small craft 
level winds/seas over the southern outer waters. Temperatures will 
remain within normal range over the northern Panhandle while 
extratropical system maintains southern areas warmer than normal. 
Forecast confidence remains below average. 


&& 


Ajk watches/warnings/advisories... 
public...none. 
Marine...Small Craft Advisory for pkz012-013-041-042. 
Small Craft Advisory due to seas for pkz022-043-051-052. 


&& 


$$ 


Prb/ahn 


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



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