Today's Weather atop Mount Washington

Mountain weather is subject to rapid changes and extreme conditions. Always be prepared to make your own assessment of travel and weather conditions. This outlook is one tool to help you plan a safe trip. Always travel with adequate clothing, shelter, food, and water.
Thursday, November 20, 2008
5:15 AM
Wind Chill Advisory...30-50 below zero today through tomorrow...
Conditions at 5:15 AM

Weather: Freezing fog and mostly cloudy

Temperature: -6°F

Wind: NW 36 mph

Visibility: 1/8 of a mile

Relative Humidity: 100%

Station Pressue: 23.21" falling

Ground Conditions: 6" snow/ice/rime w/ deeper drifts

24 Hour Statistics

Maximum Temperature: 7°F

Minimum Temperature: -7°F

Peak Wind Gust: N 44 mph

Average Wind Speed: 21.9 mph

Liquid Precipitation: 0.01"

Snowfall: 0.4"

Almanac Data

Record High: 47°F (1985)

Record Low: -7°F (1951, 1952)

Average Daily Temperature: 19°F

Average Monthly Melted Precipitation: 10.49

Average Monthly Snowfall: 40.80

Total Snowfall So Far This Month: 15.8"

Average Monthly Winds: 40.5

Sunrise: 06:41

Sunset: 4:20

Forecast Discussion

The northeast will remain in a stalled pattern for at least the next 36 hours. A quasi-stationary and broad upper level low centered over Quebec will continue to spin a series of weak disturbances in over the next 36 hours. One exiting low is to the northeast which is deepening this morning allowing winds to pick up a bit. After this, the most organized of the incoming shortwaves will be a weak Great Lakes Low that will dive south of the state over the next 24 hours before redeveloping as a coastal low tomorrow off the Jersey shore. Most of the energy with this will pass south as well but, low level moisture will be met with a northwesterly flow which is favorable for producing summit fog and occasional upslope snow showers tonight into tomorrow. Snow showers will be light as there really isnt much moisture to pull from in this air mass, so it will be a dry snow if anything. Change will slowly be occurring in the coming days as Canadian high pressure to the west will continue to build amplifying the cold northwesterly flow making for some dangerous wind chills. We will therefore issue a wind chill advisory for the higher summits from this morning through tomorrow since wind chills will meet our criteria for an advisory which is wind chills of 35-50 below. This means frost bite will take less than 10 minutes to set in on exposed skin. So take necessary precautions and clothing before heading to higher terrain today through tomorrow. Also, with such a cold air mass and only a daily record low of 7 below set in 1951 and 1952 for today, a new daily record low will probably be created with a lower likelihood tomorrow as the record tomorrow is 17 below set in 1987.

Ryan Knapp
Staff Meteorologist
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