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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.
Tuesday, September 30, 2014
7:12 AM
Conditions at 7:12 AM

Weather: Partly Cloudy w/ undercast

Temperature: 43°F

Wind: W 6 mph

Visibility: 70 miles

Relative Humidity: 97%

Station Pressure: 23.87" falling slowly

Ground Conditions: Wet rocks

24 Hour Statistics

Maximum Temperature: 53°F

Minimum Temperature: 43°F

Peak Wind Gust: NW 26 mph

Average Wind Speed: 9.8 mph

Liquid Precipitation: Trace

Snowfall: 0.0"

Almanac Data

Record High: 59°F (1983)

Record Low: 9°F (1992)

Average Daily Temperature: 36°F

Average Monthly Melted Precipitation: 8.55

Average Monthly Snowfall: 2.20

Total Snowfall So Far This Month: 0.3"

Average Monthly Winds: 29.4

Sunrise: 6:35

Sunset: 6:34

Forecast Discussion

By looking at the 2D models, today's forecast should be relatively easy. However, looking at satellite loops, neighboring soundings, model soundings and my last few weather observations, things get a bit trickier. At the surface, a ridge of high pressure will remain over the region over the forecast period keeping temperatures mild and winds low for summit standards. Aloft, in the upper atmosphere, a cut-off low will dive south across PA today then slide off the NJ shore tonight then up the coast on Wednesday. This will allow for a moist flow aloft to stream northeast and it will allow for a strong onshore flow. At about the 800mb level, at least for today, is a dry layer just above this low level moisture separated by an inversion and aloft there is a dry slot between moisture bands.

What this will likely translate to is most summits being in the fog through the day however the higher summits, those above 5000 feet, will at least start the day out of the fog above a low stratus layer with generally sunny skies above. With low winds expected today, this might remain for some time before winds pick up and allow the moist flow to be forced over the higher peaks. So the wording for today is for most of the peaks since most of them will see fog or cloudy skies from the low level stratus but the highest peaks may see a bit of in and out conditions before settling back into the fog later today. Summits that remain in the fog today will likely see drizzle falling. Overnight, a strong onshore flow will certainly bring widespread fog and drizzle to the summits. As the low approaches, it could bring enough forcing with it to allow for a few scattered light rain showers overnight into Wednesday.

Ryan Knapp
Staff Meteorologist
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