[at-l] Mt Washington this morning

[weathercarrot at hotmail.com (The Weathercarrot)]

The official low on Mt Washington this morning was -44.7, which is 2.3 
degrees shy of their coldest on record since 1933. Wind chills this morning 
also reached -100.  The nearby valley locations of Whitefield and Berlin 
(next to Gorham), which last week had 3 or 4 consecutive mornings in the -30 
to -36 range (as well as Saranac Lake, NY), may not get that cold this week 
because the winds may not die down enough (although possibly Friday 
morning). The coldest temps to hit the northern NH valleys are normally in 
the center of polar high pressure with deep snow and calm winds - 
radiational cooling with a resulting inversion (warmer on the ridge-tops). 
This is why the NH state record is a valley location (around -50) instead of 
the summit of Washington. But as long as you have winds on the surface and 
aloft (pressure gradient) and the center of high pressure doesn't pass close 
enough over head, the coldest temps stay aloft, such as the Washington 
summit this morning, and possibly the rest of the week.

wc

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