Before the event began, cold air was entrenched over the northern inner channels of Southeast Alaska panhandle. A strong low developed as it moved northeast over the Gulf of Alaska on 3/11. The associated weather front introduced warm moist air over the Panhandle creating an overrunning snow event on 3/12.

Heavy Snow in EASTERN BARANOF ISLAND AND SOUTHERN ADMIRALTY ISLAND, ALASKA
From 12-MAR-09 02:00:00 to 12-MAR-09 12:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The coop in Hidden Falls reported a new snow fall total of 11.5 inches as of 5 pm on the 12th. Nearby observations indicated that the most of the snow fell after midnight on the 12th.

Heavy Snow in JUNEAU BOROUGH AND NORTHERN ADMIRALTY ISLAND, ALASKA
From 12-MAR-09 02:00:00 to 12-MAR-09 12:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several coops in the Juneau area...primary over interior valleys reported more than 10 inches of snow from the event.  Annex Creek had received 15.6 inches snow by 6 pm on the 12th. Snettisham Power Plant received 11.0 inches by 7 am on the 13th and Canyon Island has 12.0 inches by 8 am on the 13th.  The heaviest band of snow in the Juneau area moved through between 2 am and 5 pm on the 12th based on observations from sites around Juneau.

Heavy Snow in INNER CHANNELS FROM KUPREANOF ISLAND TO ETOLIN ISLAND, ALASKA
From 11-MAR-09 23:00:00 to 12-MAR-09 14:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A spotter in Petersburg reported 9.5 inches of snow from 6 am to 2 pm on the 12th. The coop in Petersburg reported a 24 hr snow total of 12.0 inches at 9 pm on the 12th.

Heavy Snow in GLACIER BAY, ALASKA
From 12-MAR-09 02:00:00 to 12-MAR-09 14:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Two coop sites in the Gustavus area reported 8 inches of snow at 7 am and 9 inches at 8 am on 3/12. Based on observations the heavier snow started falling after midnight on the 2nd and snow continued into the afternoon hours in the area although little additional accumulation resulted.

Heavy Snow in HAINES BOROUGH AND LYNN CANAL, ALASKA
From 11-MAR-09 04:29:00 to 13-MAR-09 04:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A spotter near Haines reported 10.5 inches of snow since the morning hours and at total of 13.2 inches so far for the event at 4 pm.  By 8 pm that night they had received a storm total of 17.1 inches. Haines customs station reported an event total of 13 inches on the morning of the 13th, and the Haines Coop had a 24 hour total of 14 inches. Most of the heavy snow fell during the daytime on the 12th according to an observation site in Haines.

Heavy Snow in EASTERN CHICHAGOF ISLAND, ALASKA
From 12-MAR-09 02:00:00 to 12-MAR-09 12:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The coop observer in Hoonah reported at snow total at 9 am March 12 of 9.6 inches, and based on estimates from nearby observations sites the heavier snow began after midnight the 12th so the accumulation was in less than 12 hours.  An additional couple of inches were reported during the day on the 12th.

Heavy Snow in SALISBURY SOUND TO CAPE FAIRWEATHER COASTAL AREA, ALASKA
From 12-MAR-09 03:00:00 to 12-MAR-09 12:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The coop observer in Elfin Cove reported at snow total at 3 pm on the 12th of March of 11.9 inches.  Observations around Elfin Cove had the snow beginning after midnight on the 12th and observations at Elfin Cove showed the snow tapered off after noon that day.