Iceout 2011

Rattlesnake Gal · 03-08-2011, 01:56 PM

The water temperature at Black Cat Island at two feet is now 39.2° and at 10 feet is 32.4°

Blue Thunder · 03-08-2011, 02:56 PM

Quote:

Originally Posted by Rattlesnake Gal

The water temperature at Black Cat Island at two feet is now 39.2° and at 10 feet is 32.4°

That can't be right. I can get two different BC weather pages to load. One says what RG says and the other says 34.2.

Ice out typically happens in the 39-40 degree range.

HHHmmmmm

DickR · 03-08-2011, 07:17 PM

BT, you are right to be suspicious of temps being 39 at 2 ft and only 32 at 10 ft at the same time. That would be unstable, since water is at maximum density at about 39 F (4 C). If water were most dense at 32 F, nature would have to chill the whole lake to 32 to get the top layer to stay at 32 and permit freezing over. Circulators to keep docks ice-free wouldn't work either.

Merrymeeting · 03-09-2011, 10:44 AM

I exchanged a private message with CLA concerning the different readings between the two pages.

He told me that the issue is one of calibration of the 2' temp probe. It is currently reading too high. But it would be expensive to recalibrate so he has done a low-tech calibration against another probe.

The temp posted on the second page (the 39 degree reading) is what the incorrectly calibrated probe is actually reporting. He then manually adjusts the reading based on the comparison with the other probe, and posts that on the BC Weather page.

Merrymeeting · 03-11-2011, 07:00 AM

Still many weeks to go, but we should see an acceleration of snow and ice melt this week. Temps for the next 10 days will be well above freezing every day, and close to or above freezing at night.

John A. Birdsall · 03-11-2011, 02:52 PM

The lake is in a dangerous position right now. We have observed this situation where you have a layer of ice, then above that water and then the snow comes down and leaves apuddle under it and freezes. this makes it into a saw and we have witnessed that it can cut 6" cement cylinders in half.
Great for those of us with boat houses. I think ours gets it worse then others cause it is facing west with exposure to the north

Merrymeeting · 03-13-2011, 06:58 AM

It has definitely begun. We were in Wolfeboro yesterday. Still many weeks to go, but all the signs are there. I'll post some of the pictures I took later.

Back Bay is open and open water is flowing out into the lake well beyond Mount dock
Edges along shoreline showing signs of decay
Lakeport temp readings up to 35 today
WeatherCam temp at 10 feet now rising daily, along with 2 feet
Many areas have lost their snow cover, both on the lake and ground

And as of today, an extra hour of sunlight to melt things!

SteveA · 03-13-2011, 07:36 AM

Quote:

Originally Posted by Merrymeeting

And as of today, an extra hour of sunlight to melt things!

LOL... Someone had to say it. You beat me.

meredith weekender · 03-13-2011, 08:13 AM

The ice is definitely retreating. The docks are really opening up and with 50 degree weather coming the end of the week progress will be made. my goal is to havetheboat in by April 16th.

03-08-2011, 01:56 PM	#1
Rattlesnake Gal Senior Member Join Date: Nov 2003 Location: Central NH Posts: 5,252 Blog Entries: 1 Thanks: 1,451 Thanked 1,349 Times in 475 Posts	Temperature at Two Feet vs Ten Feet The water temperature at Black Cat Island at two feet is now 39.2° and at 10 feet is 32.4°

03-08-2011, 07:17 PM	#3
DickR Senior Member Join Date: Apr 2008 Location: Moultonborough Posts: 751 Thanks: 4 Thanked 259 Times in 171 Posts	water is heaviest at 39 f BT, you are right to be suspicious of temps being 39 at 2 ft and only 32 at 10 ft at the same time. That would be unstable, since water is at maximum density at about 39 F (4 C). If water were most dense at 32 F, nature would have to chill the whole lake to 32 to get the top layer to stay at 32 and permit freezing over. Circulators to keep docks ice-free wouldn't work either.

03-11-2011, 02:52 PM	#6
John A. Birdsall Senior Member Join Date: Apr 2004 Location: Norwich, CT Posts: 599 Thanks: 27 Thanked 51 Times in 35 Posts	ice cuttings The lake is in a dangerous position right now. We have observed this situation where you have a layer of ice, then above that water and then the snow comes down and leaves apuddle under it and freezes. this makes it into a saw and we have witnessed that it can cut 6" cement cylinders in half. Great for those of us with boat houses. I think ours gets it worse then others cause it is facing west with exposure to the north

03-13-2011, 06:58 AM	#7
Merrymeeting Senior Member Join Date: Mar 2003 Location: Merrymeeting Lake, New Durham Posts: 2,226 Thanks: 302 Thanked 800 Times in 368 Posts	It has definitely begun. We were in Wolfeboro yesterday. Still many weeks to go, but all the signs are there. I'll post some of the pictures I took later. Back Bay is open and open water is flowing out into the lake well beyond Mount dock Edges along shoreline showing signs of decay Lakeport temp readings up to 35 today WeatherCam temp at 10 feet now rising daily, along with 2 feet Many areas have lost their snow cover, both on the lake and ground And as of today, an extra hour of sunlight to melt things!

03-09-2011, 10:44 AM	#4
Merrymeeting Senior Member Join Date: Mar 2003 Location: Merrymeeting Lake, New Durham Posts: 2,226 Thanks: 302 Thanked 800 Times in 368 Posts	I exchanged a private message with CLA concerning the different readings between the two pages. He told me that the issue is one of calibration of the 2' temp probe. It is currently reading too high. But it would be expensive to recalibrate so he has done a low-tech calibration against another probe. The temp posted on the second page (the 39 degree reading) is what the incorrectly calibrated probe is actually reporting. He then manually adjusts the reading based on the comparison with the other probe, and posts that on the BC Weather page.

03-11-2011, 07:00 AM	#5
Merrymeeting Senior Member Join Date: Mar 2003 Location: Merrymeeting Lake, New Durham Posts: 2,226 Thanks: 302 Thanked 800 Times in 368 Posts	Still many weeks to go, but we should see an acceleration of snow and ice melt this week. Temps for the next 10 days will be well above freezing every day, and close to or above freezing at night.

03-13-2011, 08:13 AM	#9
meredith weekender Senior Member Join Date: Mar 2009 Location: Meredith / Manchester Posts: 373 Thanks: 87 Thanked 84 Times in 57 Posts	The ice is definitely retreating. The docks are really opening up and with 50 degree weather coming the end of the week progress will be made. my goal is to havetheboat in by April 16th.